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Bronze guides are tighter... They dont cahnge shape as much as iron. But, many Edelbrocks, Indys, and some shops I know set them too tight for me confort. So I open them up to .001-.0015. I've seen some less than .00025 and they will sieze. I think it's more of a lifter bore issue. Cam bearing clearance means very little, and nothing for lifter oiling... Loose lifters will be noisey, same as mis adjusted preload, or poor upper end oiling to the rocker shafts. The holes in the cam bearings for the left side head passage may not line up well. If that's partially blocked, the rear of the shaft (5 and 7) may show galling on the rockers.