ajw2500hd

iTrader: (12)

this is pistons on passengers side 2, 4, 6 with marks in pistons on intake side! i have had some stumbling problems with car ever since motor was in and its gotten alot worse after 1900 miles. so pulled motor out and this is what i seen


specs 98 camaro
brand new ls3 motor out of 2010 camaro
lg motorsports g6x3 cam
forged trickflow 7.4 pushrods
patroit gold dual valve springs

heads have never been off and no other stuff done to motor

what happened?

frito1

iTrader: (12)

Intake valves are tweaked on that side.

427

iTrader: (3)

Not enough valve clearance.

Kurt

hotswap

iTrader: (3)

Needs an .080 fly cut. Is that too deep, anyone?

ajw2500hd

iTrader: (12)

lg motorsports told me my patroit dual valve springs(rated 660.) are to weak that i need the 921's! but you would think if it was a spring problem it wouldn't be 3 pistons in a row, they would be all over?!?!?!? i think

Whistler

iTrader: (46)

It could be even, or the problem could be sporadic like you have. Do all 8 springs have identical seat pressure at the installed height?

ajw2500hd

iTrader: (12)

not sure about the seat pressures! the pistons should still be good right? also what do you think that 6.2 ls3 short block is worth with 1900 miles? thanks aj

ajw2500hd

iTrader: (12)

bump!!

WKMCD

iTrader: (2)

Flycut the pistons and put in 921's or PAC 1521's. Install either to .050 of coil bind. Check your valves and replace if needed. Reinstall and you're good to go. With flycutting, you should be able to mill the heads while they're off for better performance.

Just my $.02

ajw2500hd

iTrader: (12)

Ture! Ls3 short block for sale 1900 miles needs to be flycut $2000 who wants it? Block alone is $1600 new

ajw2500hd

iTrader: (12)

OK LS3 MOTOR WITH ONLY 1900 MILES ON IT!!! HAD A CAM PROBLEM BUT JUST NEEDS 3 INTAKE VALVES ON RIGHT HEAD AND GOOD TO GO

LS3 6.2 SHORT BLOCK -----$2000 (BLOCK ALONE IS $1600 NEW)

LS3 HEADS THAT ONE HEAD NEEDS 3 VALVES AND HAS PATROIT GOLD DUAL VALVE SPRINGS ------$600

LS3 INTAKE WITH INJECTORS, RAIL, GASKETS AND INJECTOR HARNESS FOR LS1
$350

Lingenfelter TRG-002 58x To 24x Crank Sensor Trigger or Reluctor Wheel Conversion Module DOES CRANK SIGNAL ONLY------$150

NICKWILLIAMS 92MM THROTTLE BODY ----$300

THANKS AJ 717-654-4397

Jim85IROC

iTrader: (6)

Are those patriot springs really to blame? I've heard scores of good things about them and just picked up a set for my LS3-headed 402 stroker. Should I be re-considering?

maxspeed05V

iTrader: (4)

I dout its from the springs, they wouldnt just all fail at once. Theres alot of guys running those springs with higher milage and no issues.

IHEARTLS1

iTrader: (1)

this is what happens when you people put a new cam in and don't check PTV clearance. LG motorsports is rediculous for not giving out camshaft specifications too, but that is another issue in itself.

ajw2500hd

iTrader: (12)

agree with you on this!! also they told me it would def. fit! on stock motor

The Alchemist

iTrader: (19)

Well, fit and safe might be two different specs....

All it takes is for an agressive cam, with spring rates not quite high enough with a heavy valvetrain and you run the risk of valve float. Now it might not normally be an issue until you put in a cam that is tight on the piston to valve clearance.

Is LG to blame? Maybe, if they sold you the cam and spring package, then their liability would go up in my opinion. If you got the springs elsewhere and they just sold you the cam and said you'd be alright, then you're kind of left to make sure you're double checking everything.

IHEARTLS1

iTrader: (1)

PTV should be checked every time regardless of what some 3rd rate company says. they are there to make money and that's it. do you think they care that this happened? when you call them up and complain or ask for a refund the only thing that will happen is the "tech" on the line will ask you if you measured the appropriate clearances. when you say "no, but the other guy told me it would be fine" guess what? SORRY CHARLIE. chalk it up as a lesson learned.

ajw2500hd

iTrader: (12)

o i have learned my lesson never pay $550 for a junk *** cam!!!!!!!!and there cam kit is $1700, every shop i talk to use those patriot dual gold extreme springs with no problem.

i picked up a 08 ls7 427 for my camaro now and you bet your *** no lg cam is going in that thing!! i was going to take the cam to a cam doctor to get checked to see if its even the right grind but lg does not give out specs.

DAVESS02

iTrader: (30)

A degree wheel and a dial indicator arent too big of an investment. Then you'd know exactly what you were installing.

IHEARTLS1

iTrader: (1)

i've never heard of a company not giving out full specs as well as a cam card with their cams until i logged onto this website. the problem is they are catering to the video game generation that wants immediate gratification and sees cars as a bunch of "speed parts" rather than a combination. it is IMPOSSIBLE to create an efficient combo that gets the most for what it is without considering its usage, weight, gearing, tire size, etc etc etc. you can't even begin to properly choose a camshaft without all this information and more. personally i wouldn't even LOOK at a company that doesn't give out specs. even companies that only give out specs @ .050. why are they hiding? let me guess they found the secret magical numbers that make it the fastest car ever and they don't want their competitors to find out their secret ingredient? give me a break.