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Got this ls1 back from the machine shop. Shop did entire bottom end, all I had to do was put the heads on. I ran a torquer v2 cam, ls7 lifters, and 62cc ported 799 heads. Confirmed pushrod length was 7.395 (I’m running 7.400) I put my used head gasket on, put solid lifters in, snugged the head down, tightened rockers to 22ft lbs and cranked the engine over (on the stand). When checking the clay for clearances I got .099 for intake and exhaust varied between .073-.084 which is below spec. What are my options here? Using stock gm mls head gaskets.
I’ve been running my engine for about 10K miles with .060” intake, .080” exhaust clearance. I let it warm up before I beat on it. The redline is set at 7000 rpm, no issues with clearance.
I’ve been running my engine for about 10K miles with .060” intake, .080” exhaust clearance. I let it warm up before I beat on it. The redline is set at 7000 rpm, no issues with clearance.
my only worry is that when I first measured it it was around .054 and after numerous times the readings would alter for the exhaust from .054,.073,.084 so they’re not exactly consistent
I’m not using checking springs but am using solid lifters for testing. Are you supposed to fully tighten rockers to 22ft lbs or just set them to zero lash??
The 7.400” pushrods are probably opening the valves even with the lifter on the base circle. They’re meant to depress the plunger in the hydraulic lifter but with a solid lifter, the plunger doesn’t move so the valve likely will.
The 7.400” pushrods are probably opening the valves even with the lifter on the base circle. They’re meant to depress the plunger in the hydraulic lifter but with a solid lifter, the plunger doesn’t move so the valve likely will.
so should I have possibly more clearance than what I’m currently reading when the hydraulic lifters go in?
If you have a decent hardware store they might have a simple spring selection. It doesn’t take anything special.
Or, if you have dual springs, just install the inner spring only.
With valve reliefs like those, I wouldn’t expect PTV to be an issue. That cam isn’t big.
Adj pushrod to 0 lash on the base circle, rocker bolt tight just as KCS said.
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Exhaust valve clearance issues 
