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Originally Posted by tubman
I would respectively disagree with this. It assumes that the Ford factory specs are gospel and the heads are right on. I have found that every set of heads I have used required work to get them to where I wanted them to be. Also, who knows what might have been done to a set of heads in the 70 years (yep, it's been that long) since the heads were cast and machined? In my opinion. any one that just slaps a set of heads on an engine without checking clearances is not doing the project justice. I will tell you from experience that aluminum heads are easier to work with than stock iron units.
Anyone concerned with flathead performance should have at least a passing familiarity with the works of Sir Harry Ricardo
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I guess a lot of us assume that someone would check the clearances, but you know what they say about assuming