BIGBOS

A friend of mine is putting the Trex cam in his 346 motor, he will be using stock heads, will there be any P to V clearance issues w/this setup?

SilverGhost

iTrader: (53)

if the heads are bone stock never been off the motor then no problems, it'll be fine

BIGBOS

yea, thats the case

Thunder still told him to check, but that would be a pain in the *** to pull the heads and use the clay process when there is no need to

SilverGhost

iTrader: (53)

i talked to Jason out there for awhile out of curiosity on that cam and he said you better check when using any aftermarket head..even if it hasnt' been milled because different vendors do their valve jobs in different ways and that can effect the PTV potentially enough to cause a problem.

everything i've see/heard/read you have nothign to worry about if the heads have never been off

Josh

iTrader: (9)

I agree with what these guys have said. If your heads have never even been off the car, you shouldn't have any problems. Just make extra super sure that the dots on the timing gears are lined up.

Josh

smithsc

You think it would make any difference if we were talking about LS6 heads instead of LS1?

Just bought a Trex off Spanky for my 02 Z06 and don't want any surprises here!!

Steve

AustinL911

iTrader: (-1)

I pulled my stock heads off the car because I was going to go with aftermarket, but decided to stick with the stockers for awhile. I'm using a Victor Reinz (NAPA) graphite gasket. PTV should still be alright, correct? Even if the head gasket was a different thickness, I wouldn't think it would change it that much. Opinions?

SPANKY LS1

iTrader: (24)

Austin- Make sure before you swap gaskets. GM graphite gaskets are ~.054 compressed, and MLS are ~.060. TR only had .070 intake and .090 exhaust with the thicker MLS gaskets. (For reference, .080/.100 is generally accepted "minimum" clearance requirement, so its being pushed already). Now, if that gasket is only .05-.10 thinner than the stock MLS gasket, you're cutting an already tight clearance down further. Be careful, and make sure that that gasket is at least as thick as the stocker, with this combo there is no extra room to play with, IMO.

Shawn

chrdij

iTrader: (1)

Valve jobs can cause problems with PTV? The reason I ask, I am going to have MTI place a set of over sized valves in by manley (2.02, 1.60) on a set of ported, unmilled ls1 heads. I plan on using the stock GM gaskets, does anyone think I will run into any problems with this cam ?

SPANKY LS1

iTrader: (24)

Usually a valve job will give you more P to V clearance, because the seats are cut, and the valve sits "deeper" in the seat, further away from the piston. If you are having a valvejob, machine shops can "sink" the valves in the seat for more P to V clearance, however, too much will negatively affect flow. My old S2.5 Absolute Speed 5.3s had the valves sunk ~.015. Good luck, Shawn

Jason99T/A

iTrader: (21)

Shawn, all of our PtV testing was with the .053" compressed graphite, not the '02 MLS gasket.

Jason

KMStevens

iTrader: (4)

I am using a comp 242/248 .610/.615 110 XE-R in my car, checked the clearance and this is what I found, the marks are hard to see but it touched. double checked everything again to make sure it was lined up right dot to dot etc and didnt make a difference. looks like Im gonna be flycutting.

KMStevens

iTrader: (4)

well the picture didnt show up, but the valves did in fact hit. I'll see if i can upload it from somewhere else.

SPANKY LS1

iTrader: (24)

Sorry, I misread. So, with the thicker MLS gasket, you'd have about .077/.097. My point was that it would fit, but there was no room for any less clearance, such as milling, thinner gasket, etc.

Shawn