lifter preload with LS7 lifters is higher then stock LS3 lifters - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JCunningham · 07-25-2015, 01:50 AM

Kip from Cam Motion sent me a message about a reply i posted on my engine having that sewing machine sound. He said I might have too short of a push rod and the Pat G lobes do not make any sound if done right. Right now i have 7.425 pushrods that put me at 1 1/4 turns to 22ftlbs. 1 turn on a LS3 = .047 so this puts me at .058 preload. well after doing some LS7 lifters require .080-.100 preload. So a 7.450 pushrod would put me at .082. a 7.475 would be at .108. I have seen some say you can go to .125 on the LS7 lifter. I want to be on the high side so its quite.
Can I go to .108?

Bodywerks · 07-25-2015, 04:40 AM

I was under the impression that the ls3 and ls7 lifters are the same part number:
http://www.camaro5.com/forums/showthread.php?t=199216

JCunningham · 07-25-2015, 04:48 AM

ls3 lifter require .060 preload ls7 .080 to .100 or .125

Bo White · 07-25-2015, 07:32 AM

12499225 is the same part #

Bodywerks · 07-25-2015, 08:13 AM

Those are them. I can't seem to find official confirmation on it, but it's all over the forums.

christianchevell · 07-25-2015, 09:19 AM

I would think the preload difference goes more to do with the difference in valve angle going from 15 degrees on a ls3 to 12 on a ls7 ? And any other things they deemed as its totally different heads and a higher output engine. And yes the lifters are the same for both.

JCunningham · 07-26-2015, 11:02 AM

ok the case circle of the stock cam is 1.506 the new cam is 1.419 so the difference is .087
the stock pushrod is 7.39? if you add the .087 to 7.39 you get a push rod of 7.477 to get the factory preload.

Kip Fabre · 07-26-2015, 11:48 AM

Quote:

Originally Posted by JCunningham

ok the case circle of the stock cam is 1.506 the new cam is 1.419 so the difference is .087
the stock pushrod is 7.39? if you add the .087 to 7.39 you get a push rod of 7.477 to get the factory preload.

The difference is.087 but you must devide by 2 because that's the diameter of the base circle so the lifter will only drop down half so that would be a difference of .043. So .05 longer would be fine.

Bo White · 07-26-2015, 12:47 PM

^^^man with the plan^^^
Yes. Divide by 2 because your looking for distance difference from centerline of the cam not distance difference from one side of base circle to the other.

JCunningham · 07-26-2015, 01:21 PM

ok so 7.39+ .043= 7.433 so ill go 7.450 and that will give me .083 preload so stock preload would be .066

Avenging Orange · 07-26-2015, 05:04 PM

I have yet to hear a quiet ls motor. Good luck with that.

Bo White · 07-26-2015, 06:22 PM

I have one.

CGT · 07-27-2015, 10:22 AM

My car just picked up a bit of noise with a Valve Spring swap. Same GM ls7 cam before and after. So valve spring pressure plays a part in the noise.

1989GTA · 07-27-2015, 12:15 PM

Quote:

Originally Posted by Bo White

I have one.

Mine too.

07-25-2015, 01:50 AM	#1
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	lifter preload with LS7 lifters is higher then stock LS3 lifters Kip from Cam Motion sent me a message about a reply i posted on my engine having that sewing machine sound. He said I might have too short of a push rod and the Pat G lobes do not make any sound if done right. Right now i have 7.425 pushrods that put me at 1 1/4 turns to 22ftlbs. 1 turn on a LS3 = .047 so this puts me at .058 preload. well after doing some LS7 lifters require .080-.100 preload. So a 7.450 pushrod would put me at .082. a 7.475 would be at .108. I have seen some say you can go to .125 on the LS7 lifter. I want to be on the high side so its quite. Can I go to .108? __________________ 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

07-25-2015, 04:40 AM	#2
Bodywerks Drives: 2015 2SS/RS/1LE Join Date: Feb 2015 Location: Tucson Posts: 866	I was under the impression that the ls3 and ls7 lifters are the same part number: http://www.camaro5.com/forums/showthread.php?t=199216 __________________ 2015 SS/RS/1LE HSA delete, VMAX throttle body, CAI inc. Intake, PRC255 heads, BTR 660 springs, BTR cryo-treated rockers, PAT G 232/240 .654/.626 110+2, johnson 2110's, Manton 502 pushrods, C5R, Melling high volume/high pressure, Powerbond 25% underdrive pulley, Proform covers, Kooks stepped headers, catless mids, Doug Thorley exhaust. 512rwhp, 446rwtq on a mustang dyno, tuned by Cunningham motorsports.

07-25-2015, 04:48 AM	#3
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	ls3 lifter require .060 preload ls7 .080 to .100 or .125 __________________ 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

07-25-2015, 08:13 AM	#5
Bodywerks Drives: 2015 2SS/RS/1LE Join Date: Feb 2015 Location: Tucson Posts: 866	Those are them. I can't seem to find official confirmation on it, but it's all over the forums. __________________ 2015 SS/RS/1LE HSA delete, VMAX throttle body, CAI inc. Intake, PRC255 heads, BTR 660 springs, BTR cryo-treated rockers, PAT G 232/240 .654/.626 110+2, johnson 2110's, Manton 502 pushrods, C5R, Melling high volume/high pressure, Powerbond 25% underdrive pulley, Proform covers, Kooks stepped headers, catless mids, Doug Thorley exhaust. 512rwhp, 446rwtq on a mustang dyno, tuned by Cunningham motorsports.

07-25-2015, 09:19 AM	#6
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	I would think the preload difference goes more to do with the difference in valve angle going from 15 degrees on a ls3 to 12 on a ls7 ? And any other things they deemed as its totally different heads and a higher output engine. And yes the lifters are the same for both. __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

07-25-2015, 07:32 AM	#4
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,021	12499225 is the same part #

07-26-2015, 11:02 AM	#7
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	ok the case circle of the stock cam is 1.506 the new cam is 1.419 so the difference is .087 the stock pushrod is 7.39? if you add the .087 to 7.39 you get a push rod of 7.477 to get the factory preload. __________________ 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

07-26-2015, 12:47 PM	#9
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,021	^^^man with the plan^^^ Yes. Divide by 2 because your looking for distance difference from centerline of the cam not distance difference from one side of base circle to the other.

07-26-2015, 01:21 PM	#10
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	ok so 7.39+ .043= 7.433 so ill go 7.450 and that will give me .083 preload so stock preload would be .066 __________________ 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

07-26-2015, 05:04 PM	#11
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	I have yet to hear a quiet ls motor. Good luck with that. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!

07-26-2015, 06:22 PM	#12
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,021	I have one.

07-27-2015, 10:22 AM	#13
CGT Drives: 2011 SSm6 Join Date: Oct 2011 Location: St.Louis Posts: 355	My car just picked up a bit of noise with a Valve Spring swap. Same GM ls7 cam before and after. So valve spring pressure plays a part in the noise.