The skirt clearance is fine but crown side to side clearance is like 021! Seem excessive. Bore is well within clearance and stock piston fits well also. I understand forged pistons expand. I read there is a lot of taper with these pistons. Also, the resistance when I push the ringed piston through the bore is significantly less than stock. CP Bullet Forged Dish Top SBF 302 Pistons and 302 Stroker Pistons Specs and Info: Engine Block All of the pistons listed below are designed to work in a 302 standard deck height block of 8.206" Bore = Finished bore size piston set is designed to work in; Stroke = Crankshaft stroke; Rod = Rod length piston is designed to work with
There is also some volume between the head and the bore, the piston and the bore, and the piston and head. All of this volume adds together to form the total fixed clearance volume. Fixed clearance (CL) is expressed as a percentage of the piston displacement (referring to Fig. 5.2):
(1) the piston and thus must be subtracted Installation of a thinner head gasket. (2)Installation of “domed” or “pop-up” pistons. Check for adequate “piston-to-valve” clear-ance at TDC. Camshafts with more overlap require more clearance. A good rule of thumb is 0.080" for intakes and 0.100" for exhausts.