Thread: Piston and valve clearance

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ok i see were they show the 9to1 in ls6 gm power book ? ls5 was the lower cr engine past 1970 gm went open chamber i did know that but the older close chamber were around 11to1 you must have a trw speed number piston like the l2349 would be 9.99 cr with a 119 open head would have a .265 dome 5/64 top and 2 ring if that is the piston you do have there is not much room for big cam. were the valves set in the heads play in to this as going to a bigger valve many time.s is above the head deck . i used this piston . but i used cams like this in engine with them pistons with some room Crower street roller like 242/250 @.050/581/573lsa112 Erson r286-1 @.050.245/254 .629/.629 lsa108 and schneider 246/264./604/610 blower cam in a stock ls6 so abit less on the ex side like 250to256 on a lsa of 112 cams used . see the pattern here nothing bigger then 250 on intake side and a Lsa of 110 to 112 should help on over lap. but nothing is a guaranteed that Erson should fit if stock valves not over deck block or heads it all stacks up and adds les to PV room ISKY has v.o.t.c valve opening at top dead center so you can work it out but i had new gm heads were off . if you get close to PV you must check every hole as thats not a machined fly cut valve relief in them pistons but forged net shape . with the low CR you have you do not want a cam much bigger then 240 @ 050 any ways i woud need much more input and a good cam pick