Gold Lifetime Member
Join Date: Mar 2006
Location: Wrightsville Beach, NC
Re: Bore to piston tolerances, crankshaft etc.
Your piston to cylinder wall tolerance will be determined by what type of piston you use. Typically a forged piston has a bit more clearance than does a cast piston, or a hypereutectic. The thing to do is contact the piston manufacturer directly and do what they recommend, ask them also about which ring pack they like and the ring gap.
As for the crank bearing clearances, on the mains I go around .0025" and up to .0035" on the thrust bearing. Rods are about .002".
With the bearings I would also call the manufacturer and get their recomendations, and oil preferences too.
1968 Camaro NHRA/IHRA SS/C 'Super Stocker' 396/Jerico
1968 Street/Strip Camaro 350 w/PG
1968 Caprice NHRA/IHRA Stock ELiminator O/SA 327-250 HP
Land of the Free Because of the Brave
It Takes a Long Time to Grow Old Friends