LS7 heads on a LS3 Block?
LS7 heads on a LS3 Block? 
The intake valve is smaller allowing it to fit an ls3 bore. RHS heads use the same valve sizes as the PRC small bore LS7 heads from TSP and a few guys have used trhem on their LS3 builds
Well, lets put it this way, the definition of small bore here is 4.065 when referencing the PRC ls7 "small bore" head. TSP doesn't want people thinking of small bore and think of the 3.898 ls1 bore like the AFR small bore 225 heads so with the stock ls7 bore being 4.125 the 4.065 bore of an ls3 is a small bore which the PRC 265 ls7 head fits.
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