Wrong , they just didn`t need as much due to chamber design . Street hemii`s or race hemi`s never had flat top pistons. The top fuel pistons were the only thing that would come close to a flat top, and they weren`t flat ! The tent roof pistons had to be machined to clear the heads, minimum clearance w/ steel rods was recommended at .060 , = QUENCH !! Good for gen 2 hemi combustion chambers. Still needed good to great gas tho.
I cut my tent roof " pent roof" as some were called down to s/s legal heigth in a lathe one time , later saw a special tool Jim Hale had made up for that , to fit the domes to hemi heads exactly , minum of .060 , QUENCH created .
I got a friend that runs 18 to one w/ with alcohol in a vega, that has an alum. block and heads------
