Good drag racing cam
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TECH Apprentice
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From: Fort Wayne, Indiana
so...no fly cutting with the TRex cam? I know that I will have to do PTV tests to make sure I don't ruin my pistons and valves, but I'm pretty sure I read that you don't need to flycut with this cam.
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TECH Apprentice
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From: Fort Wayne, Indiana
Alright guys, I need someone that has installed a TRex cam and decided not to fly cut their pistons. Did the valves kiss the pistons at all or were there no problems? I want some concrete evidence and not people just saying what they think is correct.
Thanks for any input!
Thanks for any input!
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From: Fort Wayne, Indiana
yeah, I'm going to give Thunder Racing a call tomorrow and see what they have to say, after all they make the dang thing. Anyway, if I do end up going with it I'm definately going to do a PVT test and if it fails, looks like I'll be fly-cutting. I know its a pretty serious operation but I've done some research and its well within my means, I'll just have to pick up some fancy new tools 
Besides, when I get a set of head's I'll have to fly cut anyway since I'll be wanting larger valves and some more compression.
Besides, when I get a set of head's I'll have to fly cut anyway since I'll be wanting larger valves and some more compression.
Well if you have to do it in the future the by all means do it the first time and jam the trex in there with all the good supporting valve train and a good tune and it will perform.
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From: Australia
I talked to thunder racing awhile ago and it think it was like 60" intake 80"exhaust on a normal ls1 motor for clearance most people reckon clearance of around 100" and 80" as a minimum thats for PTV clearances.
So technically the Trex does fit if it has those clearances however its under a safe PTV.
I want to go a big cam also, why dont you just decide off the bat to flycut 100" into the pistons and then you can easily mill down the heads 30" and get more compression into the motor more compression=more power.
My 2 cents
So technically the Trex does fit if it has those clearances however its under a safe PTV.
I want to go a big cam also, why dont you just decide off the bat to flycut 100" into the pistons and then you can easily mill down the heads 30" and get more compression into the motor more compression=more power.
My 2 cents
since you are wanting a drag racing cam, then i would opt for a custom grind cam. but for everybody else who just wants X amount of hp, or for a fun street car, and daily driver i would go with an off the shelf cam.
Since you are running a 4k plus stall, why not look into the TREX, or vindicator.
Since you are running a 4k plus stall, why not look into the TREX, or vindicator.
He is. Not all factory heads check out the same. Like I said the raptr would barely make it in my setup using stock stuff. Trex I would have made my own notches with the valves
LG Motorsports G5x3 or the G5xB cam 
/ 3.73 gear .only if the car is just going to be a drag car and not a dd ,but you can still drive it on the street if want too. a nice set of Livernois stg II or stg III LS6 Heads would work wonders .
/ 3.73 gear .only if the car is just going to be a drag car and not a dd ,but you can still drive it on the street if want too. a nice set of Livernois stg II or stg III LS6 Heads would work wonders . Last edited by Mac 2002 SS; Nov 11, 2010 at 07:49 AM.
I have personally ran a TREX cam in a few builds over the past 6 years. All were stock heads and stock shortblocks and never had any issues without flycutting. Should you check PTVC, yes. Did I, no. Even took a couple apart and there were no signs of a valve touching a piston. The old cam only record was recently broken, again, by another TREX car.
