i know people ask these kind of questions everyday and i have searched and tried reading and decided maybe someone could give me some light. Im getting ready to finish my car just waiting on the heads and was wondering if i should have to worry about PTV clearance with the V.3 and PRC stg 1 ls6 heads. The heads are unmilled, and the block is brand new.. i couldnt find anyone with a similar setup that was close so i decided id ask.. thanks to anyone who can help
I don't think it will hit, but it will likely be close... You don't want to over-rev, float a valve, blah blah blah... Your best bet is to check for PTV before you finish, make sure you get GOOD springs/retainers/etc, good lifters, correct length hardened pushrods, etc.
__________________ Some people argue LT1 vs LS1... I've got both. Having a Corvette motor in both of my cars is awesome... Until I've gotta put gas in both of them too 2000 Camaro SS: Sebring Silver Metallic, Hardtop (no T-Tops), Cloth interior, 6-speed, 9" rear... Motor went boom - time for bigger and better 1995 Caprice 9C1: Former cop car, now it's mine. 7X,XXX miles, went 14.809@92.4 bone stock, fastest stock 9C1 on dragtimes.
wondering if i should have to worry about PTV clearance with the V.3 and PRC stg 1 ls6 heads.
Yes you should be worried, so you need to check it to make sure.
__________________
Quote:
Originally Posted by John Lingenfelter
The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power.
that is way to close for my liking.. i like peace of mind and want the setup to last.
You could always flycut the pistons or run a bit of a thicker gasket as well... But pushing the limits to make a little more power isn't worth losing the extra peace of mind in my opinion
__________________ Some people argue LT1 vs LS1... I've got both. Having a Corvette motor in both of my cars is awesome... Until I've gotta put gas in both of them too 2000 Camaro SS: Sebring Silver Metallic, Hardtop (no T-Tops), Cloth interior, 6-speed, 9" rear... Motor went boom - time for bigger and better 1995 Caprice 9C1: Former cop car, now it's mine. 7X,XXX miles, went 14.809@92.4 bone stock, fastest stock 9C1 on dragtimes.
i have prc duals, and the heads assembled by texas speed.. i might just sell the cam and go with a 233/239
WTF????? that is a bigger cam. FWIW lots run the MS4 and stage 1 heads no prob so....... Yes it is tighter than I would personally run but many on here get away with it it.....
well this is the third motor going in the car, and id rather not have to grenade another one for something that could have been prevented.. the first( stock motor bustend the ringland on 7, the second motor had issued with the heads andended up trashing everything and this time id rather just be somewhat safe. and the 233/239 doesnt have the .643 lift the v3 does
The only way you'll find true PTV is simply by measuring it. Every motor is different. You cannot relly take any one opinion Vs the other.
TV3 is a good cam, but a bit harsh on intake lobe.
Is your motor a stock shortblock or forged? What do you want to achieve with your motor? Good power and longevity? run a bit softer lobe with similar durations. Like a 228/234 .588/.598 110+1 LSA, 11* overlap so still pretty strong lope, 6500>6600 shifts, good midrange trq. TSP does custom grinds.
It is all in your decision and the reality of the use of your motor.
There is also 230/230 .612 /.592 111+2 LSA, .08x PTV clearance on intake, very strong midrange trq, 6500>6600 shifts, softer XFI lobe on intake but still benefit from extra lift. very good "all around" street strip cam. 8* overlap good thumpthump.
lift has nothing to do with piston to valve clearance. stick with what you have it will clear fine if you stick with stock gm mls headgaskets.
Are you willing to pay for his engine if it has PTV issues??
Quote:
Originally Posted by PREDATOR-Z
The only way you'll find true PTV is simply by measuring it. Every motor is different. You cannot relly take any one opinion Vs the other.
Exactly, people can only guess. Once you start the engine and it eats itself alive, you are the only one that is paying the bill to rebuild.
__________________
Quote:
Originally Posted by John Lingenfelter
The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power.
Last edited by SweetS10V8; 06-09-2009 at 06:41 AM..
Are you willing to pay for his engine if it has PTV issues??
Exactly, people can only guess. Once you start the engine and it eats itself alive, you are the only one that is paying the bill to rebuild.
exactly i want somehing thati can be safe with.. because in reality i might miss a shift/gear and i dont want another $3k mistake. people may call me crazy but for the little power i might lose, ill make it up somewhere else
.050 lifts have little to do with PTV clearance since that occurs near BDC and contact will occur from 10* BTDC to 10* ATDC.
Poeple confuse .050 lift with tappet lift on a regular basis.
If you miss a shift, even with stock cam, you will pay the price. At least bent p-rods.
As I said earlier, think and be truthful to the reality of what you want this motor to do. Choose your cam based on that.
.050 lifts have little to do with PTV clearance since that occurs near BDC and contact will occur from 10* BTDC to 10* ATDC.
..
Its been mentioned here so many times but I dont think it will ever really sink in that max lift really doenst play too much in ptvc since a piston crash will occur at the lowest lift area.
__________________ 2000 T/A, M6, Black
Forged 347, H/C/N2O
Quote:
Originally Posted by Disturbed Bird
LS1tech mods are like the C.I.A. you can quote me on that lol
well thats my misunderstanding, im still learning.. but i just think its to agressive for the dd that i put prob 50 miles a day on and drive all night friday and saturday. but if i go to the v2 will it be as abusive on the valvesprings as the v3?
well thats my misunderstanding, im still learning.. but i just think its to agressive for the dd that i put prob 50 miles a day on and drive all night friday and saturday. but if i go to the v2 will it be as abusive on the valvesprings as the v3?
v2 is less abusive.
__________________ 2000 T/A, M6, Black
Forged 347, H/C/N2O
Quote:
Originally Posted by Disturbed Bird
LS1tech mods are like the C.I.A. you can quote me on that lol
PTV Clearance Torquer V.3/ PRC 243's 
Its been mentioned here so many times but I dont think it will ever really sink in that max lift really doenst play too much in ptvc since a piston crash will occur at the lowest lift area.
