Valve Drop Measurement on PRC CNC Stage 1 LS6 Heads?
#3
He wants to know how recessed the valve job is in the head. I would imagine it would depend on the core used because texas-speed will cnc your heads or use one of their cores.
#6
#7
There is actually very little I could find posted. Of the few posts that I did find, I think cathedral port stuff is .155" intake head only and .165" exhaust head only. .200 intake assembled and .210 exhaust assembled withe a factory MLS gasket and ls1/ls2 type flat top pistons. I wish measured my old stock 317s before I sold them.
What is surprising to me is how many threads there are about "how much cam and will fit", yet so few measuring this.
What is surprising to me is how many threads there are about "how much cam and will fit", yet so few measuring this.
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#8
I'm surprised too. When I started talking to Kip at cam motion that's one of the things he asked me. I didn't want to pull my stock 243 heads so I was searching everywhere for the info.
Thanks for posting this stuff!
Thanks for posting this stuff!
#9
You don't have to pull the heads to do an assembled valve drop.
Just pressurize the cylinder with 100+ PSI of air using your compression tester hose hooked to your air compressor, removed the valve springs, put a couple rubber bands on those valve stems to stop the valves from falling in the cylinder when you let the pressure out of the cylinder, put that cylinder at top dead center and then let the valves down until they rest on the pistons. Measure the distance from fully closed, to where they rest on the piston. That is your assembled or "actual" valve drop.
This is what I did last night. It took me about an hour and a half to do the whole deal including putting it back together. But, my car is a lot easier to access everything than most guy's fourth gen Camaros. It should be easy on your Nova too.
Just pressurize the cylinder with 100+ PSI of air using your compression tester hose hooked to your air compressor, removed the valve springs, put a couple rubber bands on those valve stems to stop the valves from falling in the cylinder when you let the pressure out of the cylinder, put that cylinder at top dead center and then let the valves down until they rest on the pistons. Measure the distance from fully closed, to where they rest on the piston. That is your assembled or "actual" valve drop.
This is what I did last night. It took me about an hour and a half to do the whole deal including putting it back together. But, my car is a lot easier to access everything than most guy's fourth gen Camaros. It should be easy on your Nova too.