vic jr. heads...big enough reliefs?

[jammer84_03]

well, i am switching out heads and going with a set of victor jr. heads. my only issues it im not sure if the valves are going to contact the pistons at all. right now i have speed pro pistons:
http://store.summitracing.com/partdetail.asp?part=TRW-8KH273CP30&autoview=sku

and a comp cam extreme hyd. energy series cam:

http://store.summitracing.com/partdetail.asp?part=CCA-35-351-8&autoview=sku

how would i go about finding out if im going to have clearance issues? and if i do, could i notch the piston reliefs? thanks in advance

 

[lx93notch]

fill the relifes in the piston with clay. with the motor assembled turn it over slow a few times. pull the head off and look at the impression in the clay to determine your clearance

 

[jammer84_03]

ok....heads fully torqued? and about how much clay would you use, just a litle to see if it touches? and i should be able to cut the reliefs if it does make contact even with a hyper piston?

 

[86bluecobra]

When I did mine I installed the heads with no gaskets. Spun oil pump with a drill and cranked engine over by hand. Then pulled off heads and measured the plastercine. I was fine but I do not have factory pistons. I have dished pistons.