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Engine Block Casting Numbers - Small Block

 

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Small block V8: 262, 265, 267, 283, 302, 305, 307, 327, 350, 400 - Big block here


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As you are probably aware the release of the 265 cid engine in 1955 introduced a revolutionary engine design that has become one of the most, if not the most, popular overhead valve V8 engines ever manufactured. Often referred to as a "small block" or "mouse motor" due to its design and not necessarily its cubic-inch displacement possibilities. When General Motors introduced the Mark-IV 396 engine in 1965 it was referred to as a "big block" or "rat motor."

 

The venerable small block engine has ranged in cubic-inch size from 262 to 400 in factory form until its demise in 2003, an impressive 48 year run, in favor of a new generation of small block V8s. Factory horsepower ratings ranged from 110 horsepower with the 262 V8 engine to a whopping 370 horsepower with the LT1 Corvette in 1970 before horsepower ratings were drastically cut in 1971 due to government emissions requirements.

 

Fuel systems included 2-barrel versions, 4-barrel versions, 2x4-barrel versions, and fuel injection.

 

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Notes:
The 327 cid engine came in small journal and large journal, 1962-1967 were small journal (2.00-inch rod journals and 2.3-inch main journals), 1968 and later are large journal (2.10-inch rod journals and2.45-inch main journals).
All listings are 2-bolt main bearing unless otherwise noted.

 

 

 

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