1967 chevy 327 engine specsclarksville basketball
1964, Chevy 327 Engine Identification, Best Small Blocks: #11. "@type": "Question", A 2,500-rpm stall-speed torque converter was a must. The camshaft got its name from the lash settings, which were 0.30 for both the intake and exhaust. We have much more information about the ever-popular 327 Chevy engine. Each suffix code indicates the type of carburetor, transmission, and availability of air conditioning. The 350 became popular in the Nova in 1968, and not long after, it became the base engine in the Corvette In 1969. Make, either bus or truck. Connect the tach/dwell meter by clipping the red wire on the meter to the positive "+" terminal on the ignition coil. Numbers matching drive train with 327/350 HP, rebuilt Muncie 4 speed. Chasis type, either small trucks or military vehicles. Chevy Hardcore NEWSLETTER - SIGN UP FREE! People prefer r 4 bolt main because it is stronger than a 2-bolt mains. The good-guy price back in the day was $239 plus tax. The first two versions of the L76 and L84 from 19621963 both used the solid lifter Duntov camshaft. } } The L84 is one of the best 327 Small Blocks; it produced 375 horsepower and is a high-winding screamer. Like the Duntov, the 30-30 was also a solid lifter design. }] 5. Many of the 302s internals were forged-steel to handle the abuse. A fuel-injected model produced the highest output, and others had a single four-barrel carburetor. Lauren H. has sold new and used cars, negotiated numerous car deals, has a thorough knowledge of the best and worst vehicles produced, and has spent the last 10-years as an automotive writer. The 302 cubic-inch engine was equipped with a Duntov 30/30 camshaft, which offered .452/.455-inch lift. This placed the engine under the SCCA Trans-Am limit of 305 cubic inches . . In 1969, there was a slight change in the position of the timing mark, so you should use one that matches your engine, unless you are planning to make up your own timing . LT1, Chevy 327 Engine Identification, Best Small Blocks: #8. No, they are nothing alike. This is because they both have the same bore hole. They in fact DID make a 327 4 bolt main. This 327-cubic-inch engine and 265-cubic-inch powerplant developed the nickname Mighty Mouse during its eight years of production. Get the Best Performance with ATK Engines High Performance Crate Engine Small Block Chevy 350ci / 330HP / 380TQ HP291PM parts at JEGS. Place the transmission in neutral. These engine all use the same short engine or bottom end. 327 engines maintained their lineups but increased their outputs, especially the two prominent versions. There were only two versions available, both with two-barrel carburetors. Check the tach meter. The 302/327 high-performance balancer (PN 3817173) is a good choice for any engine. I have worked on most issues small to large in a selection of modern and classic cars. I paid $300 for it, poured starter fluid down carb and she purred. In addition to Chevrolet, manufacturers like Checker cabs, Gordon-Keebler (England), ISO Rivolta (Italy), and Studebaker, all used versions of the 327. The Chevy engine serial number is mostly seven to eight digits that you will find on the engine block. You will find the block code at the back ledge of the block at the back of the passenger side cylinder head close to cylinder #8. 7. The 327 had 250, 300, and 340 horsepower options based on the carburetor and compression ratio. 350, Chevy 327 Engine Identification, Best Small Blocks: #6. The compression ratio is 11:1. From 19671968, there was also a version of the L79 that made only 325 horsepower, too. Vehicle history and comps for 1966 Chevrolet Corvette Convertible 327/ L79 VIN: 194676S103054 - including sale prices, photos, and more. All of them had overhead valve (OHV) configurations with 2 valves per cylinder for 16 valves total. The General Motors 5.3 is a 325 engine and is nothing like the old 327 engine. "text": "You can find the engine code in the lower corner of your windshield close to the driver's side. Though not the largest or most powerful engine that Chevy has ever produced, the 302 cubic-inch V8 is definitely one of the most distinguished. "@type": "Answer", "name": "How To Read A Chevy VIN Number", Main jet:185 Air correction jets:110 . Continue with Recommended Cookies. Start the engine. It used a new block and reversed flow cooling system. The final year for the 327 engine was 1969. We and our partners share information on your use of this website to help improve your experience. There were no L79 Chevy IIs in 1965 and only 6 were produced in 1967. The compression ratio is 11:1. Index of articles associated with the same name, https://en.wikipedia.org/w/index.php?title=Chevrolet_small-block_engine&oldid=1133053464, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, The third, fourth, or fifth generation of, This page was last edited on 12 January 2023, at 02:24. The 327 cu-in (5.4 L) small block L79 engine was the most powerful one offered in the 1967 Chevelle. In fact, the 325 engine is not similar in any way to the old 327 engine. at 3,600 rpm. "acceptedAnswer": { but preserve their original engine specifications and body configuration. However, generally on the older 327s a more aggressive cam will sacrifice some low-end torque and performance. FULL SPECS. The BoxWrench Engine Specs Database is a community resource for mechanics of all skill levels to access a reference library of Firing Orders, . P/N 3911068 is a production spring used on all 302 and 350 hi-perf. You wont find any alphabet in a casting number. For the final year of production for the 1969 model year, there were just two options available. He holds a Bachelor of Science in electrical engineering from the University of California at Berkeley and continued with graduate study in software engineering. { And were talking about parts from different vehicle models spanning back almost 45 years. Instructions for Ignition Timing in a How Do I Set the Timing on a 1995 Ford 1968 camaro z28 hood air intake image by Jorge Moro from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. GM 5.4L-327ci-V8 Engine Torque Specs. Small Block engines are also called mouse motors; their displacement is less than 400 cubic inches." Brake design, maybe heavy duty, anti-lock brake, or four-wheel disc. The LT1 is a second-generation Small Block engine. lifter cams. Chevy also introduced in 1967 the first two-barrel (instead of four-barrel) carbureted 327, the LF7. This arrangement is common because it requires less space." Shipping Weight: Weight of basic vehicle with regular equipment and grease and oil. or give us a call at (678) 279-1609. If you are trying to find your Chevy engine block with casting numbers, you can confirm this by doing the following. All Rights Reserved. In some cars, the engine serial number can give information about the number of cylinders, the additional features, and so on. The LS7 produces 505 horsepower and is present in the Chevrolet Corvette Z06 and Chevrolet Camaro Z28. Even today it is still highly reviewed by small-block enthusiasts, a testament to its simple but solid design. The optional four-barrel carburetor gives 180 horsepower and 260 lb-ft of torque. Cylinder Numbering: Distributor Rotation . "@type": "Question", . at 3,600 rpm; and 350 hp at 5,800 rpm and 360 ft-lbs. The highest horsepower for this engine was 365 with a four-barrel Holley carburetor. Learn more about our writers on our about us page. Among these, the fuelie versions strapped to the L84 were the best flowing and offered the best performance. But, depending on the year of the block, the main difference between the two is the journal size. The block casting numbers are always at the back ledge of the block at the back of the driver-side cylinder head close to cylinder #7. Manufacturing division, maybe GMC or Chevrolet. "text": "A Chevy Big Block always has a displacement of 400 cubic inches or more, small bores to enable efficient breathing, longer strokes, and an overall bigger shape. Whether its the 265, 327, or 283 cubic engines, you can be sure you are picking some of the most impressive eight-cylinder engines produced by Chevy V8. Writer Bio. In the modern day, the Chevy 302 cubic-inch engine is a much-sought after piece of muscle car history. Also, based on the 327 engine block, the 350 was popular in passenger cars and trucks. I am here to help you with your car questions. $49,995. With the El Camino II 327 (5.3) RPO L30 has a naturally-aspirated V 8 cylinder engine, Petrol motor, with the engine code Turbo-Fire. Small Block engines dont produce much power but offer simplicity, acceleration, and handling. If the engine clatters when you accelerate, move the timing down towards the "0" by two degrees. The 1967 Impala was slightly restyled, but still looked very similar to its immediate predecessor. at 3,400 rpm; 325 hp at 5,600 rpm and 355 ft-lbs. Stepping up to either a two or four-barrel equipped 283 cubic-inch V8 got you 195 or 220 horsepower. Most Chevy engines comewith codes that give information about where and when they were made, the horsepower they can produce, and their size. 6. The L84 was the only version to get fuel injection, courtesy of the Rochester RamJet system GM invented in the 50s. All versions had forged aluminum pistons, forged connecting rods, and a forged steel, small-journal crankshaft. Ranging from common problems info to performance modification guides, we cover everything muscle car. In 1964, Chevy came out with a new cam, known as the 30-30 camshaft, though some also call it the Duntov 30-30. "text": "The order of a Chevy VIN is; 1. But is that particular engine reliable and does it perform? Or it might have also had a 375 with a Rochester Ramjet fuel-injected system. 1965-69 Chevrolet engine tune-up specifications including timing, dwell angle, and spark plug gap, and firing order. 2023 Vehicle History Inc. All Rights Reserved. Going with a minimum of 650 double or quad-barrels is a good starting point, and the 750 QuadraJets are reasonable upgrades. "name": "How To Tell What Engine I Have", This Is a great article. 57 Chevy Trivia Quiz Questions With Answers, do catalytic converters have serial numbers. Reattach the vacuum hose to the distributor. All Small Block Chevy engines have stamped ID code, which gives information about the assembly plant code, production date, suffix code, engine VIN, and block casting number. TorkSpec. } Chevy never made a 327 four-bolt main. In all, the L79 camshaft gave good throttle response, a great power curve, decent power brake vacuum and a lumpy, performance, 800-rpm idle to boot. Mileage unknown. You can find the engine code in the lower corner of your windshield close to the drivers side. There are different versions of 327, common with Corvettes and trucks. To handle the high engine RPM, the 302 cubic-inch V8 was equipped with a forged-steel crankshaft and connecting rods. They are durable, easy to use, and maintain. Chevy Big Blocks weigh more because of their size, mostly referred to as porcupines. 12-17. This arrangement is common because it requires less space. Start the engine and warm it up for a few minutes then turn it off. The L79's Ancestry Im amazed as i had 365 real HP back then, New engines dont have as much power naturally aspirated! Well discuss the engines history, go over its technical specifications and vehicle applications, and then explore the engines basic design. Be it good or bad, 1967 saw some revisions made to the 396ci engine lineup. Notes: Base Corvette Coupe with 327 cu. For 1964, Chevy kept the same lineup of 327s, but increased the output of the two most powerful versions. An example of data being processed may be a unique identifier stored in a cookie. L79, The Underdog Engine code stamping numbers provide helpful information about the engine and the vehicle. 5. Today, the Chevy 327 is one of the most sought out 60s engines today in many collectors Bel-Airs, Corvettes, Camaros, Impalas, Novas, and others. All other 327 engines used hydraulic lifter camshafts, and several of them were quite aggressive. Locate the timing marker on the driver's side of the timing cover at the front of the engine under the water pump. "text": "Your car engine can be in different sizes, depending on your type of vehicle and the brand. Red line radial tires. Set the parking brake. The engines of the following year had the same specifications. at 3,200 rpm; and 350 hp at 5,800 rpm and 360 ft-lbs. "acceptedAnswer": { at 2,800 rpm. This difference was due to California emissions regulations, which required that vehicles soldin California use an AIR (air injection reaction system). The compression ratio was 11:1. Make Chevrolet. "@type": "Answer", The hose routes to the carb base I believe. The 327 Chevy engine is still being used today by many classic Chevy auto enthusiasts. Save my name, email, and website in this browser for the next time I comment. Few today remember or were ever even told that the "advertised horsepower" of many engines in the '60s were often stretching the truth. },{ They produced 365 and 375 horsepower at 6,200 rpm, but the compression ratio reduced to 11:1. He received certificates from Pontiac (parts system), Cat Diesel (engine service), Saab and Fiat (parts- warranty system). 7. While the Rochester RamJet was far from reliable, the 327 did not suffer from very many common problems or defects. That made four engines available for 1967: the LF7, L30, L74/75, and the L79 (the L74/75 was basically the same but used different RPO for different models). "name": "Do Engines Have VIN Numbers", Features; How it works; FAQ; Projects; . 2. find your Chevy engine block with casting numbers. Most car enthusiasts believe that the Chevy Small Block enginesset a milestone in automotive engine history. 1962 through 1967 All 1962-67 327 crankshafts are forged steel and have 3.25-inch stroke with 2.00-inch rod journals and 2.30-inch main journals. This article will cover everything you need to know about the Chevrolet 327 engine that lasted from 19621969. My thoughts are if there were some that were made, they were not likely RPO models. A stamping number includes: Here are some examples to get you acquainted with how to read and identify a 327 engine, based on its serial numbers: ED Engine suffix code (Chevelle, manual transmission). Almost all versions used carburetors for fueling, and most of them were four-barrel versions. Over 6,000 Automotive Torque Specs. All of the L79 Chevelles and Chevy IIs could be had brand new for under $3,000 if so-ordered properly. 1967 chevy 327, 1967 chevy 327 small journal, horsepower specs The consent submitted will only be used for data processing originating from this website. Chevrolet small-block engine refers to one of a number of gasoline-powered vehicle engines manufactured by General Motors. Holden, the Australian based subsidiary of General Motors, also used various versions of the Chevrolet 327 engine in the 60s. Small Block Chevy V8. The brand created 302 for race cars, and its components contain the 327s engine block and 283s crankshaft. Follow @corvettestory The L-48 and ZQ3 reached 300 horsepower levels, and later, two more versions (LT-1 and L-46) came into existence, producing 350 horsepower. And the following are just some of the vehicles that have had a 327 engine in them: There are plenty of questions out there about this exceptional motor. The 400 was the largest version of the first-generation Small Block. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn. These were the L30 (250 horsepower, 350 lb-ft of torque), L74/L75 (300 horsepower, 360 lb-ft of torque), the L76 (340 horsepower, 344 lb-ft of torque), and the L84 (360 horsepower, 352 lb-ft of torque). It has an aluminum block and a coil-on ignition, producing up to 350 horsepower. "name": "What Liter Is A 350", Send A Message. at 3,200 rpm; 340 hp at 6,000 rpm and 344 ft-lbs. These engines offer simplicity and power. The first two numbers indicate the months, while the last two indicate the day. Though, it is much more expensive. The 327 engine was Chevys best production engine in numbers and in longevity. Between 1917 and 1919, there were about 3,000 vehicles that had an almost obscure engine called the Chevy Series D V8 that had 55 horsepower at 2,700 rpm. "@context": "https://schema.org", All gages work. The L79 engine featured larger valves, a compression ratio of 11.0:1, and an aluminum high-rise intake with a Holley carburetor. For those looking to build their 327 V8 engines today, there are a couple of important places to start. in. A long-block (with big valve heads and oil pan) was around $400. The 5.7 LS1 is a third-generation Chevrolet Small Block. Model Camaro. Chevy 6-cylinder engines have a clear and straightforward engine numbering system, which is why it is straightforward to read and decode. That spring is rated at 358 per inch. Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, . It produces up to 450 horsepower and 500 lb-ft of torque. The enginewas given an oversquare design, created by the4.00-inch bore and 3.00-inch stroke. From 1958 until 1965 the 283 V-8 was the only V-8 engine available for Chevy pickups. The Chevy 327 is one of the best Chevy Small Block engines, it produces 170 horsepower and an optional Small Block V-8 got a complete 4.00-inch bore, 3.25-inch stroke, and a displacement score of 327 cubic inches. 4. Today, 327 fuel injected L84 Corvettes routinely go for more than $100,000 in clean condition. Do you have experience with the Chevrolet 327 V8 engine? 'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs'); Body Upper Structure Length at Centerline. Powering this early muscle car was Chevrolet's 283 cu-in engine. "text": "The V stands for engine formation or the way the cylinders are arranged in the engine. L86 and L87 are found in SUVs and trucks; the LT1 produces 460 horsepower, LT2 produces 490 horsepower, while L86 and L87 produce up to 420 horsepower. 6. However, below are the best Chevy V8 engines you can get. Engine type. The L84 only appeared in the Corvette and no other models. Engine type. VIN. Compression varied anywhere from 8.5:1 all the way up to 11.25:1 (see chart above). The LT1 also used a speed density fuel management system, mass flow air sensor, and sequential port injection. These tools have been tried and tested by our team, they are ideal for fixing your car at home. 327 Chevy Engine: A.K.A. 88.13 N-m. The bore and stroke of the engine is 4.001 x 3.25 (101.6mm x 82.55mm), making it a bored and stroked version of the smaller 283 cid small-block. We have much more information about the ever . When it came to choosing a big block engine in the Chevelle, the 396 was still the only engine of choice. With a maximum top speed of 122 mph (196 km/h), the Camaro I 327 has a naturally-aspirated V 8 cylinder engine, Petrol motor. Both had compression ratios of 9:1. 1967 Chevrolet Corvette 327/ L79 Convertible 12-17. The casting numbers may include the following; The easiest way to know your engine is to check the VIN in your owners manual or under the hood. They did not make as much power as the Duntov or 30-30, but were still high profile for their day. Keep in mind that GM didn't see the need for a 4 Bolt in the SBC until 1969 when it offered it in the 302 only. See more. Three Speed Manual Transmission, 300 Horsepower Standard Engine, Four Speed Manual Transmission, 300 Horsepower Standard Engine, Powerglide (Automatic) Transmission (RPO M35), 4.00" / 3.25" (Standard, L79 327 Cubic Inch), Crankcase Oil Capacity, Standard, L79 Engines, Crankcase Oil Capacity, L36, L68, L71, L88 and L89 Engines, 4-Speed Manual Transmission, close ratio, heavy duty. at 4,600 rpm. Updated on 03/17/17. The compression ratios ranged from 10.5:1 and 11.5:1. (37.07%)Convertible: So, the 350 engine is bigger. The larger strokes, smaller bores, and big valves in Chevy Big Blocks improve efficiency and displacement, especially for trucks or vehicles that require more power to run; this is why Big Block engines are the best in higher-demand situations. 22,940 Then in 1968, these were still produced with a four-barrel carburetor but they had more horsepower and torque. 5.7 LS1, Chevy 327 Engine Identification, Best Chevy V8 Engines: #4. Both had compression ratios of 9:1. The engine will be running, and you will be close to the fan blade and fan belts. From 1962 to 1965, these were produced with four-barrel carburetors. Here are some ways that you can perform a Chevy 327 engine identification. at 4,000 rpm, and 375 hp at 6,200 rpm with 350 ft-lbs. The engine contains a 7-8 digit code of numbers and letters. Though it only had a limited production span, the Chevrolet 327 V8 motor was one of their best in history. CKX you find this engine in the 1972 Corvette, 1973 Camaro, or 1976 Corvette; they all have a 350 cubic-inch displacement. street engines.It is recomended for all hyd. 7.0 LS7, Chevy 327 Engine Identification, Best Chevy V8 Engines: #5. The remaining two or three digits indicate the coded suffix; if your code is CMP, you have a 305 engine with 240 horsepower. at 3,200 rpm; 300 hp at 5,000 rpm and 360 ft-lbs. 123456 last six digits of the vehicles VIN. It also made a fuel-injected model that produced up to 360 horsepower. It worked great with the carburetors, intake manifolds, pistons, cylinder heads, and the camshafts that were used in the 1960s. The L79 was a rocket from 2,400 rpm right on up to 5,800 rpm. New black soft top and red hardtop. Show More . In addition to Corvettes and Camaros, Chevrolet also used the 327 engines in the Biscayne, Bel Air, Impala, Nova, C10 truck, and many other models. . These numbers contain all information about your engine, including the size." They are lighter in weight, and this contributes to their impressive performance. The 1962 C1 Corvette, powered by the fuel . Use caution around moving engine parts. some Corvettes and 1962-1967 Chevy II's) Oil Pump: Melling high volume; Balancer: PowerBond internal balance 8 in. of torque at 2,400 rpm. Today, engine parts for this motor are plentiful and can be found at any reliable auto parts store.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'enginefacts_com-medrectangle-3','ezslot_1',112,'0','0'])};__ez_fad_position('div-gpt-ad-enginefacts_com-medrectangle-3-0'); Engine Facts 2023. You can find a Small Block Chevy engine code stamping number at the back ledge of the block at the back of the drivers side, mostly close to cylinder #7. Early (1962-1964 . The 275hp gets 64cc (462 later 291) 1.94/1.5 heads, cast iron intake and 4BBL Quadrajet. GM/Chevy did not make the change to measuring their engines horsepower by Net ratings until after they had already retired the 327 from production in the 1970s. From 1967-1968, Chevy used the L30 and LF7 versions inside the Camaro, which made 275 horsepower and 210 horsepower, respectively. If you have S0924 as the prefix code; If you have QB as the suffix code, it means 1962 Impala, CID:409, HP:409, and four-speed transmission. Specs. We research hundreds of models each We have a team of writers working daily on common car problems. As one of a gazillion Chevy high-performance guys who grew up in the late '50s and '60s, the 1965-1968 L79 327 (rated at both 350 hp and 325 hp) was for many the "Best Overall Chevy Small-Block of the '60s." The 327 arrived in 1962 with a 3.25-inch bore and 4-inch stroke. After the exhaust, you will probably want to look at upgrading the distributor, carburetor, and camshaft. The first versions of the Chevy 327 engine produced had about 250 to 340 horsepower. The first digit will be a capital letter that indicates the plant that built the engine, and there are only 7 GM plant codes: The next four digits are all numbers, and they indicate the date the engine was cast. 11. 3. 265 Turbo-Fire V-8, Chevy 327 Engine Identification, Best Small Blocks: #2. We rolled it out of yard down the street started it; let her warm; and wallah. Chevrolet initially debuted the 327 engine for the 1962 model year and it lasted until 1969. Chevrolet small-block engine. Chevy then made a more potent Power Pack option. . There was also a 235 horsepower and 325 lb-ft of torque version often simply branded as the Turbo-Fire V8 (after the engine family) that appeared in many full-sized Chevys. Engines have VIN numbers, all in the engine code or engine number. Make, either bus or truck. The 327s within these years produced 250 horsepower at 4,400rpm, 300 horsepower at 5,000 rpm, 340 horsepower at 6,000 rpm, and 360 horsepower at 6,000 rpm. Pretty much every Chevy coming off the line in the 1960s could be ordered with some version of the 327 engine. The Mighty Mouse. "@type": "Answer", The compression rating is 140 pounds per square inch. Once you locate the stamping number or code of a Big Block Chevy engine, identifying what kind of engine it is, is very easy. We have a focus on strong photography, and engaging articles about performance, luxury and interesting cars. According to MotorTrend, these versions are so called because of the visible ID mark on the sides that have a design with two humps. 6.2 LT1/LT2/L86/L87, Big Block Chevy Engine Code Stamping Numbers, Small Block Chevy Casting Number Location, Conclusion On Chevy 327 Engine Identification. When fitted with a Rochester fuel injection system and a Duntov camshaft, the 327ci small-block churned out 360 HP at 6,000 RPM, and 352 lb-ft of torque at 4,000 RPM. They developed 365 hp at 6,200 rpm with 350 ft-lbs. References. They made 275 horsepower at 4,800 rpm, 300 horsepower at 5,000 rpm, and 350 horsepower at 5,800 rpm. Dodge Catalytic Converter Scrap Price: How Much Is It Worth? Many of these engines can easily go past 150,000 miles without issue, which is quite the accomplishment considering their age. Chevrolet introduced the 327 engine on the 1962 Corvette by enlarging the cylinders of the 283-cubic inch, small-block V-8. The eight digits in your VIN will give you every information you need about your car and the type of engine powering it." The engine contains a 7-8 digit code of numbers and letters. Adding a cat-back to complete the exhaust will add maybe another 5 horsepower, but will definitely improve the tone and volume of the exhaust. Model year. },{ If you had an extra $93.00 burning a hole in your pocket, you . I've never seen one with anything but a 4-speed but apparently it was possible. Depending on the vehicle, the Chevy 327 could make anywhere from 210-375 horsepower and 320-360 lb-ft of torque (SAE Gross). at 2,800 rpm. You will find the engine VIN close to cylinder #2 at the front passenger side of the block, or you can find it at the top of the flat block above the timing cover. The good guy price was $39. We always thought the carb was smallish. Its a V8 engine that many sports cars, boats, custom motorcycles, and off-road trucks have featured. } Although the 327 was eventually superseded by the . We will then round out this article with some of the most frequently asked questions about this powerful engine. These large, eight-inch balancers are the best ones to use, and there are several of them. Some numbers you see on a valve cover or air intake will make it very easy for you to identify your kind of Chevy engine. "@type": "Answer", 4 bolt main is the number of bolts (4-2 on each side) holding the main bearing caps to the block of an internal combustion engine. The only big difference was now the low end 327 came with a 2 barrel carburetor which severely lowered the horsepower for the engine.