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I finished my friends '71 Chevy C20 farm truck enough for now! But I'm planning for next year!
Currently it has an edelbrock 600 carb/performer intake, recurved HEI and small 206/212 comp cam http://www.summitracing.com/parts/CCA-12-230-2/ on the factory 307 motor. It is better than it was stock (2bbl motor), but it is still pretty gutless.
I have read where swapping on dirt cheap casting number "416" 305 heads with 58cc chambers and 1.84in/1.50ex valves is a good way to up the compression and help these small displacement motors get more low end.
The motor is in great tight condition. Cranking compression is 120-125psi on every cylinder. Swapping the heads would be an easy weekend job. Plus I'm sure if I look hard enough I can find the heads really cheap!
Has anyone actually done this? I'd like to hear real world feeback on the results. If it is a major seat of the pants improvement, I think it would be worth the effort. But for a small increase, I doubt I would bother.
I am also curious with roughly 9.3:1 if 93 premium pump gas would be required? The truck is only used for farm work, so heavy 2500 pound loads are not that uncommon. I would assume heavy loads would increase the chance of detonation.
Just looking for anyone who has done the swap, or something similar, and what their thoughts were on the results.
I have searched the net and found a TON of people talking about it, but no replies as to driving impressions afterwards.
Currently it has an edelbrock 600 carb/performer intake, recurved HEI and small 206/212 comp cam http://www.summitracing.com/parts/CCA-12-230-2/ on the factory 307 motor. It is better than it was stock (2bbl motor), but it is still pretty gutless.
I have read where swapping on dirt cheap casting number "416" 305 heads with 58cc chambers and 1.84in/1.50ex valves is a good way to up the compression and help these small displacement motors get more low end.
The motor is in great tight condition. Cranking compression is 120-125psi on every cylinder. Swapping the heads would be an easy weekend job. Plus I'm sure if I look hard enough I can find the heads really cheap!
Has anyone actually done this? I'd like to hear real world feeback on the results. If it is a major seat of the pants improvement, I think it would be worth the effort. But for a small increase, I doubt I would bother.
I am also curious with roughly 9.3:1 if 93 premium pump gas would be required? The truck is only used for farm work, so heavy 2500 pound loads are not that uncommon. I would assume heavy loads would increase the chance of detonation.
Just looking for anyone who has done the swap, or something similar, and what their thoughts were on the results.
I have searched the net and found a TON of people talking about it, but no replies as to driving impressions afterwards.
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