Rusty Nuts

Small Block Chevrolet Data

Disclaimer Note: 

The information presented on this website is a compilation of data collected by the owners of this web site. The original data was presented and published in various Automotive Magazines such as Hot Rod Magazine as well as many other books and journals over the past thirty years or so.  

If any information presented is incorrect, please send a correction with source data via e-mail to : rustynut@rustynutscarclub.com 

General Motors Celebrates the Small Block - Here's a few facts about the small block that you might not know.

Chevrolet Small Block Basics - CID / Bore / Stroke / Journal Sizes - Plus two engines built from the 350 cid  and 400 cid components.

Chevrolet Small Block Head Numbers

Chevrolet Small Block Casing Numbers

General Motors celebrated the 50th Anniversary of the Small Block on October 28, 2005

Here are some of the highlights along the path of the infamous SBC engines:

• 1955 - Introduction of the 265 CID V-8. The 265 CID produced 165 hp w/2 barrel carburetor setup & 195 hp w/4 barrel carburetor setup. 

• 1957 - Introduced the 283 CID . With the Rochester Fuel Injection Unit installed, the output was pushed to 283 hp.
• 1962 - Introduced the 327CID, by 1964 The early 1960's 327CID now produced 375 hp.
• 1967 - The Camaro Z28 sports the new 302 CID with 290 hp.

                     Introduction of the New 350 CID V-8                    

• 1968 - Introduced the Large Journal Crankshafts for the 302, 327 & 350 CID V-8's

                    Also Introduced the 307 CID V-8  

                        The 302, 307, 327 and 350 CID engines now had: Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

• 1969 - 302 CID and 327 was discontinued after 1969 model year.
• 1970 - The 400 CID V-8 @ 240 hp is introduced and is the largest small block produced. The 350 CID LT1 V-8 now makes 370 hp @ 6000 rpm.
• 1973 - 307 CID was discontinued after the 1973 model year.
• 1975 - GM downsizes engines due to Fuel Crisis - The 262 CID at 110 hp is the smallest small block to  be made by GM.  Bore - 3.671, Stroke - 3.100  The 262 CID was to small to power any wheelbase over 110 in and was discontinued after the 1976 production year. 
• 1976 - Introduction of the 305 CID V-8  Bore - 3.736, Stroke - 3.480
• 1979 - Introduction of the 267 CID V-8  Bore - 3.500, Stroke - 3.480.  The 267 CID engine was discontinued after the 1981 production run due to poor power output.
• 1980 - Last year for the 400 CID V-8 production.
• 1992 - Began production of the Generation II 350 CID with 300 hp.
• 1997 - An "All-Aluminum" Generation III 350 CID with 345 hp is introduced.
• 2002 - The 405 hp 350 CID V-8 LS6 is placed in the Corvette Z06
• 2005 - The 50th Anniversary will be highlighted by the introduction of a new fuel efficient cylinder deactivation 325 CID V-8 295 hp Generation IV engine.  The new C6 Corvette will be offered with a 364 CID V-8 400 hp small block.

Two more V-8's created from the SBC engines above:

• 372 CID - Use  400 CID block (4.126 bore), 350 CID Crank* (3.484 Stroke), 400 CID pistons on  350 CID with 5.703 connecting rods.  

  • * = Use TRW Bearing Kit M53564P or equivalent to make up difference in main bearing diameters.   Also be sure to use the flywheel and harmonic balancer from the 350 CID.

• 383 CID - Use 350 CID block (4.001 bore), 400 CID Crank* (3.750 Stroke), 350 CID pistons on 400 CID with 5.565 connecting rods.

  • * = .The 400 CID crankshaft will have to have the main journals machined (cut down) from 2.650 in to 2.450 in diameter to fit the 350 CID block.  Also use the flywheel and harmonic balancer from the 400 CID.

SBC Basics - CID / Bore / Stroke / Journal Sizes

265 CID : Bore - 3.750,  Stroke - 3.000,  Main - 2.300,  Rod Journal - 2.000, Rod Length - 5.703

283 CID: Bore - 3.875,  Stroke - 3.000,  Main - 2.300,  Rod Journal - 2.000, Rod Length - 5.703

327 CID: Bore - 4.001,  Stroke - 3.250,  Main - 2.300,  Rod Journal - 2.000, Rod Length - 5.703

302 CID: Bore - 4.001,  Stroke - 3.000,  Main - 2.300,  Rod Journal - 2.000, Rod Length - 5.703

350 CID: Bore - 4.001,  Stroke - 3.480,  Main - 2.300,  Rod Journal - 2.000, Rod Length - 5.703

NOTE: Beginning In 1968 the small block 302, 307, 327 and 350 CID engines were equipped with large journal crankshafts: Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

302 CID: Bore - 4.001,  Stroke - 3.000, Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

307 CID: Bore - 3.875,  Stroke - 3.250, Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

400 CID: Bore - 4.126,  Stroke - 3.750, Main - 2.650,  Rod Journal - 2.100, Rod Length - 5.565

262 CID: Bore - 3.671, Stroke - 3.100, Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

305 CID: Bore - 3.736, Stroke - 3.480, Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

267 CID: Bore - 3.500, Stroke - 3.480, Main - 2.450,  Rod Journal - 2.100,  Rod Length - 5.703

 

Below are a couple of engines achieved by using components from the 350 CID and the 400 CID small blocks.

372 CID ( see note 1): Bore - 4.126, Stroke - 3.484, Main - 2.650,  Rod Journal - 2.100, Rod Length - 5.703

383 CID (see note 2): Bore - 4.001, Stroke - 3.750, Main - 2.450, Rod Journal - 2.100, Rod Length - 5.565

Notes:

1. The 372 CID uses the  400 CID block (4.126 bore), 350 CID Crank* (3.484 Stroke), 400 CID pistons on  350 CID with 5.703 connecting rods.  Use TRW Bearing Kit M53564P or equivalent to make up difference in main bearing diameters.   Also be sure to use the flywheel and harmonic balancer from the 350 CID. The 372 de-stroked engine will produce faster and higher rpm's. 

2. The 383 CID uses the 350 CID block (4.001 bore), 400 CID Crank* (3.750 Stroke), 350 CID pistons on 400 CID with 5.565 connecting rods. The 400 CID crankshaft will have to have the main journals machined (cut down) from 2.650 in to 2.450 in diameter to fit the 350 CID block.  Also use the flywheel and harmonic balancer from the 400 CID. The stroked 383 will provide additional low and mid-rpm -range horsepower and torque, but high rpm's will be limited by the longer stroke.

    

    

Chevrolet Small Block Head Numbers

Chevrolet Small Block Casing Numbers

Disclaimer Note: The casting numbers presented on this website is a compilation of data collected by the owners of this web site. The original data was presented and published in various Automotive Magazines such as Hot Rod as well as others over the past twenty years or so.  

Chevrolet V8 Head Casting Numbers from 1955 - ..?

SMALL BLOCK CASTING IDENTIFICATION NUMBERS.
(Sorted by CID)