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I know it's very old thread, we now have the luxury of knowing boss cylinder heads in the Gen 1 group are better they have better metallurgy they have the same aluminum as 67 scorpion heads much better mettalurgy much better porting, there even better than stock Gen 2 heads but if you port Gen...

I know it's an old post exhaust 13 mm lift intake or 12 mm lift thought it was a 260 intake 263 exhaust and maybe the other way around I was under the impression the Cobra jet would be a 13 mm intake as well as exhaust and I thought it was a 290 and a 293 profile which was originally what they...