Is 426ci 360 a small block?

moper said

I agree. That's why I rarely recommend those heads on something that needs to make big numbers. I tend to get beat up for that but I feel better knowing it's a return on investment nightmare to make them really work on such an engine.

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You're absolutely correct. The LAX/MAX head was designed to be a street replacement head, just like the EQ heads are. The only reason I bought the LAX heads in the first place was because they were the spec'd head for the dyno contest we were entering in 2010.