Quote:
Originally Posted by lovehamr
Well, BDR 687's block ('66 428) and heads Edelbrock 427 w/2.19" intake and 1.71" ex) are at the only machine shop in this area that I trust.
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My memory (that I do not trust) is that the larger valves for the 427 will hit the cylinder wall on the smaller bore 428. It seems that the cylinder can be machined for the valve to clear, but it is argued that the shrouding of the valve makes it not worth the effort. I'm not sure if the 2.19" works OK with a 428 or not. Hopefully someone will let you know if I remember this correctly or if I'm full of crap.