EllisJuan

iTrader: (1)

I have a set of LS6 heads milled .030 and can get a good deal on a 228/230 581/591 112 LSA +4. Do you think it will fit without piston to valve issues?

I REALLY do not want to pull a head to clay.

Nitroused383

iTrader: (10)

You do not need to pull the heads to check PTV clearance. You just need a checker spring, a dial indicator and a degree wheel. I think it will be pretty close, around .050-.070" clearance on the intake and maybe .100" on the exhaust. Always best to check it out though. If it was too close you could always retard the cam a few degrees, but that will give up some of your low end torque.

00MaroonZ28

iTrader: (3)

You should be O.K.

Sales2@Texas-speed

iTrader: (5)

That's sound advise.

You can also do the trick with .080-.100" feeler gauges between the valve tip and rocker...at about 10º before and after TDC you'll want to check every degree for the tightest clearance. If you can still push the valve down any with a checker spring on there, with those feeler gauges in there taking up that space, in theory you'll have AT LEAST .080-.100" PtoV clearance. This saves you a couple bucks by not having to purchase a dial indicator with mounting provisions and all. Hope that helps!

TooLateVTEC

iTrader: (2)

What CC's are your heads?

Mine are milled to 62cc's and the lift is .591/.601 and the clearances were .08X and .10X .

Hope this helps.

PREDATOR-Z

Lift at .050 has almost nothing to do with PTV clearance.

EllisJuan

iTrader: (1)

I ended up putting in a 224/228 .581/.588 114LSA. Pretty sure the heads are milled closer to .040 because P2V was pretty tight. Made good power though...

Alvin@PCMofNC

We use the same method.. Old hot rodders trick Works better than dial indicator in my opinion



You would want to use an adjustable pushrod and have the rocker torqued at zero lash. With the checker springs and the proper lenght pushrod you'll preload the valve with the light weight springs as opposed to preloading the lifter like you do normally.

KCS

iTrader: (20)

That method doesn't really sit right with me personally. If the valve hits the piston, it'll preload the lifter and you may not even notice and think you have clearance. That and you don't actually have the load of the springs on the rockers, so .080-.100" would be excessive without deflection factored in. I like to use the indicator method myself. I think I had ~.060" on the intake valve with checker springs.

EllisJuan

iTrader: (1)

That is about what I had using the checker spring. I figured I had a little more than that in reality because of the reasons you stated. About 2.5k miles so far and no issues.