Re: Side Exhaust Pipes
Hi Paul, In the "Chevrolet by the numbers" book, those two part numbers are 2 inch manifolds. 7038 is a RH manifold for the 64 250hp w/ac & 300hp engines w/AT & AC and 65 250 (early) w/ac and 300hp w/ac & AT. the 9965 was used with the 58-61 283 and 62-63 250 & 300hp engines. So you'll need to order 2 inch pipes if you keep those manifolds. The correct part numbers for your car are 3747042 RH and 3846559 LH. But what you have works also, obviously. I don't know enough about the actual castings to know if you give up any performance using what you have now, probably not. Mike
Hi Paul, In the "Chevrolet by the numbers" book, those two part numbers are 2 inch manifolds. 7038 is a RH manifold for the 64 250hp w/ac & 300hp engines w/AT & AC and 65 250 (early) w/ac and 300hp w/ac & AT. the 9965 was used with the 58-61 283 and 62-63 250 & 300hp engines. So you'll need to order 2 inch pipes if you keep those manifolds. The correct part numbers for your car are 3747042 RH and 3846559 LH. But what you have works also, obviously. I don't know enough about the actual castings to know if you give up any performance using what you have now, probably not. Mike
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