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Chevrolet Big Block Intake Manifold Casting Numbers

 

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Big block V8: 348, 409, 396, 402, 427, 454


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The "big block" Chevrolet engines included here are the 1958 through early 1965 348 cid and 409 cid engines as well as the Mark IV 396/402/427/454 "rat motors."

 

The big block engine ranged in cubic-inch size from 348 to 454 in factory form. Factory horsepower ratings ranged from 250 horsepower with the 348 V8 engine to a whopping 450 horsepower with the LS6 454 "King of the Hill" engine 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 3x2-barrel versions.

 

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1966 RPO L35 396 cid, 325 hp
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1966 Corvette RPO L36 427 cid, 390 hp
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1967 Corvette RPO L71 427 cid, 435 hp
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1968 Chevelle RPO L78 396 cid, 375 hp
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1969 Corvette RPO ZL1 427 cid, 430 hp
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1969 Chevelle RPO L72 427 cid, 425 hp COPO
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1970 Chevelle RPO LS6 454 cid, 450 hp
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1971 Chevelle RPO LS3 402 cid, 300 hp

 

 

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