Studytime

iTrader: (15)

Just got off the phone with John at Futral (thanks for the help John). I called him with some PTV clearance questions. I inquired about PTV clearance with the FM14 cam and milled LS1 heads. John said that he had milled some LS1 heads .030" and used those with the FM14. He also went to speak with Allan while putting me on hold. Allan told him that he had ran some .030" milled heads, but to be "safe" he suggested that I try to target a .024" mill.

How does this sound? I mentioned that I would be running GM MLS gaskets, but John never asked what LSA I'd be running. Should I assume that he assumed I would run a 112? I know the 112 would be tigher than the 114LSA version.

I'm not trying to say anything negative at all, I'm just looking to see if anyone has more input. They didn't mention the clearances on the intake/exhaust at all, so I'm kind of hoping someone here may have measured and could offer some hard data.
The setup is actually for a friend's car, it's not mine. I'm porting some 241s for him, and I'm going to suggest that he mill them according to what Futral says. I don't want him to run into problems later down the road, but I want his car to make all the compression that it safely can.

The setup will consists of,

Ported 241 heads with most all the special tricks I know (209cfm @ .300", 300cfm @ .600"). They have stock, 2.00" valves in them.
GM MLS gaskets
Stock LS1 shortblock
New LS2 chain
Reused LS1 lifters
Chrome moly pushrods
LS6 oil pump ('01 car)
The stock LS6 intake with ported TB
Pacesetters with 3" cutout
LS7 clutch
Patriot dual springs
FM14 cam (232/234 112LSA cam) high? or low? lift. Not sure what he wants.
10-bolt

That's most of the important stuff I can think of. It's just a basic build with a FM14, but I want it to make decent compression.

Here's the thing, he doesn't have the FM14 cam yet, but we want to install the heads/springs now, and then add the cam later this summer with a tune.

How do those PTV clearances sound?

Ben T.

hellbents10

iTrader: (10)

i would clay it to be sure. Most go .080 on the intake and .100 on the exhaust to be safe. Allthough there are a lot of people running in the .060 area.

Studytime

iTrader: (15)

How can I clay it before I have the camshaft? That's the reason I posted this thread in the first place. See the second to last sentence of my post.

As for the tolerances, you are correct, I also want to target approximately .070-.080" on the intake and ~.100" on the exhaust. Perhaps I should have explicitly stated this myself.

Ben T.

Jason99T/A

iTrader: (21)

You can't go strictly off of how much the heads were milled. If the heads have had a valve job, you really need to check the valve drop on the heads and take this into account. This could either help or hurt you.

Let me know what the valvedrop (before or after milling) and I can let you know approx. what your clearance will be. I have done a bunch of F11-F15 installs with ported heads and some clear fine, while other are tight. It really just comes down to the particular heads in question.

Jason

FDLS1

iTrader: (2)

Maybe this will help you out, here is my setup and PTV clearance is fine

241 heads stage 1 TEA Milled 0.030, stock valves
Cometic 0.040 Head Gaskets
CAM- Futral F6 226/230 .575/.595 112lsa

TEA also told me if I would be running a stock head gasket I could run a Cam 232/232, since they had a few customers doing it without any PTV clearance problems.

Sigforty

Ben,

If it makes you feel any better I was running my Dart 205s (2.02/1.60 valves) milled .035 with my F14 on a 112. I do not know the clearances, but when everything was removed for the new engine there was no contact with the pistons or valves.

Studytime

iTrader: (15)

Mark, that does help. I know the Dart 205s have just slightly less PTV clearance than a 241 does.

What gasket were you running?

Ben T.

Sigforty

cometics

PREDATOR-Z

Any feedback would be guessing. Measure it while assembling. There are too many variables, the biggest is the piston position, valve seating position etc...
I would have to agree with Allan on the .024 mill. I know of one person using a Comp 232/234 on a 112+0 that ran it with a 4cc mill.

Studytime

iTrader: (15)

Predator, the reason I'm asking is because he doesn't have the cam right now. That's what i was mentioning in the second to last sentence on my original post.

Ben T.

LS1rulz

iTrader: (1)

And what you're being told is don't install the heads alone. That's the obvious conclusion since they're telling you to measure. And I agree. You should measure.