Pushrod Length Question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

lspower62 · 07-02-2014, 11:39 AM

I am in the middle of installing a night fur cam on my ls3 and I ordered 7.425 rods but i measured and actually nee 7.375 which is the exact length of the stock ones i pulled out. would it be alright to re use the stock push rods rather than order and wait for hardened 7.375's?

thanks

MightymouseSS · 07-03-2014, 12:17 PM

I used 7.425 in mine.

BenningJ · 07-03-2014, 12:25 PM

Do not use the stock push rods for an after market cam. I believe Lethal Racing recommends the 7.425" length for the LS3.

MightymouseSS · 07-03-2014, 01:05 PM

I was told 7.40 is too short unless your heads are milled. And that 7.425 would be better choice cuz it would have a better preload on the valvetrain over the shorter 7.40.

lspower62 · 07-03-2014, 02:06 PM

Thanks guys, also do I have to put each cylnder into top dead center firing position in order to re install the rockers and the proper tourqe

Iam Broke · 07-03-2014, 03:29 PM

Yes, better to not be fighting the springs while torquing them down.

JCunningham · 07-03-2014, 08:26 PM

they recommend 7.425 for ls3 and 7.400 for l99. did you add in the preload when you measured. preload of .060-.075

BenningJ · 07-04-2014, 11:33 AM

Quote:

Originally Posted by MightymouseSS

I was told 7.40 is too short unless your heads are milled. And that 7.425 would be better choice cuz it would have a better preload on the valvetrain over the shorter 7.40.

7.425" is correct. Not sure why I was thinking 7.400" for the LS3.

07-02-2014, 11:39 AM	#1
lspower62 Drives: 2010 White 2SS m6 Join Date: Jul 2012 Location: MA Posts: 33	Pushrod Length Question I am in the middle of installing a night fur cam on my ls3 and I ordered 7.425 rods but i measured and actually nee 7.375 which is the exact length of the stock ones i pulled out. would it be alright to re use the stock push rods rather than order and wait for hardened 7.375's? thanks __________________ Corsa Cb, RX catch, Vararam, LT Headers catless, slowhawk tuned, 20% tint, hks1inch lowering springs, zl1 20x11 wheels, nt05's, aac side-markers, more comingl ...

07-03-2014, 12:17 PM	#2
MightymouseSS Drives: 2011 LS3 Join Date: Jan 2012 Location: el paso tx Posts: 547	I used 7.425 in mine. __________________ Vararam Stainless Works Headers Vmax TB SLP loudmouth 2 Nightfury Cam Mike Norris CC Tuned by Southwest Speed

07-03-2014, 12:25 PM	#3
BenningJ Drives: 2013 AGM 1SS/RS LS3 Join Date: Mar 2011 Location: Cedar Falls, Iowa Posts: 1,581 View My Garage	Do not use the stock push rods for an after market cam. I believe Lethal Racing recommends the 7.425" length for the LS3. __________________ 2013 Camaro 1SS/RS - Ashen Gray Metallic \| LS3 \| CAI Inductions, Inc Intake \| Vmax Ported Throttle Body \| Dynatech 1.875" Long Tube Headers \| Apex Scoop & Washer Bottle Relocation \| Lethal Racing Night Fury Cam \| BTR 7.400" Push Rods \|LS2 Dampener \| Melling 10296 Oil Pump \| IWIS Chain \| BTR .660" Dual Valve Springs \| BTR Trunion Upgrade Kit \| Lethal Racing Tuned \| Anvil Notch Spoiler \| BMR Split Drop Springs \| Eaton TrueTrac \| GM 3.91 Gears \| LPW Diff Cover \| Rohana RF2 275/40 20x10F 315/35 20x11R \| BMR Polyurethane Motor Mounts Last edited by BenningJ; 07-04-2014 at 11:34 AM. Reason: Fixed: 7.400" to 7.425". Removed misinformation.

07-03-2014, 01:05 PM	#4
MightymouseSS Drives: 2011 LS3 Join Date: Jan 2012 Location: el paso tx Posts: 547	I was told 7.40 is too short unless your heads are milled. And that 7.425 would be better choice cuz it would have a better preload on the valvetrain over the shorter 7.40. __________________ Vararam Stainless Works Headers Vmax TB SLP loudmouth 2 Nightfury Cam Mike Norris CC Tuned by Southwest Speed

07-03-2014, 02:06 PM	#5
lspower62 Drives: 2010 White 2SS m6 Join Date: Jul 2012 Location: MA Posts: 33	Thanks guys, also do I have to put each cylnder into top dead center firing position in order to re install the rockers and the proper tourqe __________________ Corsa Cb, RX catch, Vararam, LT Headers catless, slowhawk tuned, 20% tint, hks1inch lowering springs, zl1 20x11 wheels, nt05's, aac side-markers, more comingl ...

07-03-2014, 03:29 PM	#6
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Yes, better to not be fighting the springs while torquing them down. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

07-03-2014, 08:26 PM	#7
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	they recommend 7.425 for ls3 and 7.400 for l99. did you add in the preload when you measured. preload of .060-.075 __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1