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Discussion Starter #1
I'm getting ready to build another engine for my 66 gto Cannot decide which would work the best 400 or 455. Any body have any suggestions? I already have a set of 670 heads and a set of 455 4x. Also have a roller cam 236/224 @.50.
 

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I say 455. I am running a 70 455 H.O. 64 head in my 66 hardtop and a 73 455 with 78 6x heads in my 78 Trans Am SE. both 30 over
 

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I was running a 1970 455 with 670 heads with a rooler cam for years just switched out the solid roller cam to hyd cam and put eldebrock heads on i like that set up better can actually drive car and not worry about breaking stuff like with that solid cam.
 
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