>003+ on the rods and .004+ on the main bearing in iron block with steel rods work well for me, I'm in the middle of assembling a new KB aluminum wedge block that has .0040+ on the mains and around .0027 + on the rods, I would feel a lot better with .003+ clearance on the Scat steel H beam rods. This motor has a set of CNC ported B1 heads with a sheet metal tunnel ram with two Mark Sullens E85 prep Dominator carbs, I'm going to try NOS on it starting with two kits, 150 on the small kit first and then, maybe, another 300 HP on the second kit if it will (the chassis) take it luck shruggy
I've never used any power adders so this will be the first time luck
My thinking on any HP or and race motors bearing clearances it is way better to have way to much bearing clearances than a TINY bit too little work

Last edited by Cab_Burge; 11/12/22 02:14 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)