New head/cam setup. P/V Clearance ISSUES???
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New head/cam setup. P/V Clearance ISSUES???
Here's my new setup. Let me know what ya think!! Am I gonna have any p/v clearance issues?
PRC 5.3L stage 2.5 (NOT milled) gm head gaskets
TSP torquer vs. 2 (232/234, .595"/.598", 112 LSA)
TSP chromemoly 7.4" pushrods
Stock Rockers
Rollmaster Double-Roller timing set
LS6 ported oil pump
Coated Pacesetters w/ TSP 3" ORY
Powerbond 25% underdrive pulley
LS6 intake
Comp oem replacement lifters
ARP hex head bolts
Misc. other goodies
It's gonna be fun!!
PRC 5.3L stage 2.5 (NOT milled) gm head gaskets
TSP torquer vs. 2 (232/234, .595"/.598", 112 LSA)
TSP chromemoly 7.4" pushrods
Stock Rockers
Rollmaster Double-Roller timing set
LS6 ported oil pump
Coated Pacesetters w/ TSP 3" ORY
Powerbond 25% underdrive pulley
LS6 intake
Comp oem replacement lifters
ARP hex head bolts
Misc. other goodies
It's gonna be fun!!
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let us know your dyno times when your done. im putting in an fm14 on 112 in a week.id like to compare our set up's my cam in pretty close to yours i have the absolute speed 2.5's 5.3's.i was thinking about that cam as well but i got this f14 for 250 with only dyno time on it.the price made it an easy decision.
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#9
If I were you, I'd measure clearance. I, along with 50 other people, was sure my setup would be fine. I wasn't going to check. Luckily I did and averted disaster. Now I'm scrambling for a solution...
Good Luck, working on your car is fun when it goes well
Good Luck, working on your car is fun when it goes well
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You didn't say what size valves you have, that's rather important. I had to flycut with AS 5.3L unmilled with 2.02 valves. MY P/V clearance with a CC XER 228/230 was only .042-.045. on the intake. The problem is many people think they clear fine until they have some valve float or an over rev, then kaboom. In my opinion there are more guys running around with potential disasters than anyone realizes.
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Originally Posted by bigdsz
You didn't say what size valves you have, that's rather important. I had to flycut with AS 5.3L unmilled with 2.02 valves. MY P/V clearance with a CC XER 228/230 was only .042-.045. on the intake. The problem is many people think they clear fine until they have some valve float or an over rev, then kaboom. In my opinion there are more guys running around with potential disasters than anyone realizes.
Then why would the shop say they would clear?
Now I'm starting to rethink my setup because I don't want to run into that issue, at what point do you usually get valve float?
#12
If you saw my post, you would measure. I asked around like you are doing before I bought my setup. They said I'd be fine if I milled to 62cc's. I stayed at 64 just to be 100% sure I'd have no problems. As it turned out, my original unmeasured setup, left me with only .011 clearance on the intake side. I drove around and raced for months not knowing. It was only this week when I put my new heads on that I noticed that I was playing with fire. Simply switching to a gasket .012 smaller caused me to hit the valves. If I had taken everyones word and not neasured, I'd have just wasted tons of cash. Now I'm scrambling for a solution...It's better to be safe than broke!
My cam is smaller than yours, 230 228 with a .591 lift.
My cam is smaller than yours, 230 228 with a .591 lift.
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I had a number of shops that I really respect told me my latest cam would clear, no problem. I don't call .045 clearance, no problem. The point is a cam may actually fit and not have immediate P/V contact, but the scary thing is the potential is there for disaster.. 2.04 valves make clearances even tighter.We just put a big cam in a friends car, who had been running only a 224/228 before, when the heads were pulled, guess what, the intakes kissed the pistons on a couple of cylinders. All I can say is not checking clearances by measurement and clay is very foolish.
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Originally Posted by Z06-Dave
If you saw my post, you would measure. I asked around like you are doing before I bought my setup. They said I'd be fine if I milled to 62cc's. I stayed at 64 just to be 100% sure I'd have no problems. As it turned out, my original unmeasured setup, left me with only .011 clearance on the intake side. I drove around and raced for months not knowing. It was only this week when I put my new heads on that I noticed that I was playing with fire. Simply switching to a gasket .012 smaller caused me to hit the valves. If I had taken everyones word and not neasured, I'd have just wasted tons of cash. Now I'm scrambling for a solution...It's better to be safe than broke!
My cam is smaller than yours, 230 228 with a .591 lift.
My cam is smaller than yours, 230 228 with a .591 lift.
So it really doesn't matter what type of spring pressure you have, you can still get float and piston kissing?
Maybe I should have gotten a smaller cam with these 2.04 valves or not get the large valves, now I'm confused. But first I'll learn how to measure for P/V clearance.
Thanks guys.