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glw |
9 years ago in CHEVROLET
Answers (2)
9 years ago
I believe the difference is the intake manifold and the exhaust manifolds have different casting numbers, the original carb was a Carter too.
9 years ago
The 327/250 and 327/300 had the same cam, pistons and compression ratio. The 327/250 had 1.72/1.50 valve heads, the 300 had 1.94/1.50 valve heads. The 327/250 had a Rochester 4GC carb and matched intake manifold, the 300 a higher air-flow Carter AFB carb and matched intake. The 327/250 had exhaust manifolds with 2" outlets and head pipes, the 300 had manifolds with 2 1/2" outlets and 2 1/2' head pipes. There were some exceptions. For example the '65 327/250 (last year for this engine) had 1.94/1.50 valve heads...the same as the 327/300. Some 327/300s had the smaller 2" outlet exhaust manifolds.