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Originally Posted by goquick
The reason I asked is that I have a couple yh code 428's and wondering if in the right car it could be made competitive with the larger valve heads.
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Agree with johnta1. NHRA has the bores listed at 4.125. They also just released the new ruling that you can go 75 over instead of 70.
Depending on your wall thickness, I would go 4.195 bore. The 428 engine is probably the best Pontiac ever made.
Lynn