Since Scott Shafiroff is a complete jack*ss and has blamed everything on Crane Cams for sending us the wrong cam, we are ordering a cam from Clay Smith.

AFR 210's with 302 replacement pistons

Cam duration 264/264

Gross lift is 585/585

Will piston to valve clearance be okay?

He may be, but he's got bucks! You'll have to measure the clearances. It's the only way you'll know for sure. Thanks, Gary.

Garys right the only way to be sure is check it.There are to many variables.

Put the Clay on the piston and head on motor with out gaskets and set lash like motor suppose to run,,, roll over real slow ,,, take off head and measure with small ruller while clay on piston,,, then you know what real clearances are,,, factor in gasket and go from there,,,.080 intake / .100 exhaust with steel rods...If Scott can do it ,,, You can too. Work for me, and I stayed at Holiday Inn last nite.

If I remember from your last thread, you lowered the compression to approx. 10:1 with the 76cc AFR's. 264@.050 is an mighty big stick for a 10:1 302. I would definitely check P-V clearance with the 'old school' 302 replacement pistons, a 2.08" valve, and 264 degrees duration.

If you don't want to pull the heads again, you can do a fairly accurate check of piston to valve clearance using the 'valve drop' method. Take a free drop measurement at 10 and 7 degrees BTDC, TDC, and 7 and 10 degrees ATDC. In my motor, these measurements were in the .278" to .313" range. Now you must mock up the valvetrain with lightweight check springs on at least one cylinder and take actual valve lift figures at the same 10,7,TDC,7,10 locations on the correct stroke. My actual valve lift figures were between .107 and .193. For example, at TDC on the intake valve, my free drop was .293 and actual valve lift was .138 giving me a PV clearance of .155". At 10 degrees ATDC on the intake valve, my free drop was .313 and actual valve lift was .193 giving me .120" PV clearance. Minimum recommended piston-to-valve clearances are generally in the range of .120" (exhaust) and .100" (intake), but people go tighter.

Dang, that's some big heads and a big cam for such a little motor. I know you're asking about PV clearance, but I sure hope you are running lots of compression and plan to wind it really tight . . .

PV clearance will be tight. Those AFR 210 heads have 2.08" intakes which puts the edge of the valve .030" closer to the edges of the valve reliefs than with the stock 2.02" camel humps. Just make sure you measure it -- the tighter the LSA and the more you advance the cam, the closer PV clearance will be.