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158 Posts
I planned on building a 347, and bought GT40 heads that I plan to port myself. Now I am thinking for the same amount of money I can build a 396. If I port these heads the best I can and drill out the bolt holes to 1/2" will they be enough for a street motor? It will probably hardly ever see 6,000 RPM. I know they are the same heads they used on the lightning which was a 351, but those were supercharged. Should I keep them or sell them and look for stock 1970 351 heads and port those?
Thanks
Thanks