VERY disappointed, think it's my fault, cam, see here please
Originally Posted by P Mack
Good call on the preload Camaroholic. How many turns did it take to torque the rockers down?
The best way is to get a pushrod length checker ($20) and adjust it till you get the desired preload then read the length. Did you count how many turns it took to go from 0 preload to 22 ftlb?
no P Mack.
Insert all 16 pushrods (7.400" is probably needed unless you have highly milled heads or a small cam, in which 7.350" might be needed), place pedestal back on the head, apply locktite to all the rocker center bolts and reinstall all the rockers. Torque the rockers to 22lbft.
Now, using your 24mm socket wrench, turn the motor over by hand (should be difficult as you are now building compression) and make sure the motor turns over by hand a full 720 degrees, then turn it another 360 (doesnt have to be exact or anything).
Go over all the rockers again with your wrench just to make sure they are all at 22-24'ish lbft
Above was from LS1howto.com. That is how I did it. I can quickly pull valve covers off and recheck torque on the rockers. I don't see how that would hurt. Also how do I find out what desired preload is?
Insert all 16 pushrods (7.400" is probably needed unless you have highly milled heads or a small cam, in which 7.350" might be needed), place pedestal back on the head, apply locktite to all the rocker center bolts and reinstall all the rockers. Torque the rockers to 22lbft.
Now, using your 24mm socket wrench, turn the motor over by hand (should be difficult as you are now building compression) and make sure the motor turns over by hand a full 720 degrees, then turn it another 360 (doesnt have to be exact or anything).
Go over all the rockers again with your wrench just to make sure they are all at 22-24'ish lbft
Above was from LS1howto.com. That is how I did it. I can quickly pull valve covers off and recheck torque on the rockers. I don't see how that would hurt. Also how do I find out what desired preload is?
Last edited by Michael Ozorowsky; Feb 28, 2005 at 04:32 PM.
Yeah it wouldn't hurt. You don't need to recheck the torque, you need to check the preload. Look at the "yella terra install" instructions on ls1howto if you don't know how, but ignore the part about the shims.
If you had a pre load problem you probably would have a backfire when you were on the hammer.As far as diffrent dyno numbers i wouldnt worry about that if you say the car feels like a dog you have to have a problem.Im not 100% that preload is not the problem.You need to get a cylinder leakdown tester and see were your at with these cylinders.You will also be able to back off the rocker to see if it helps seal the cylinder.If it helps your cylinder from leaking your pushrods are to long if i does not help then you have a valve issue.And some hammerhead posted tighting down the heads to stop the leak 
.People like that scare me.The tricky part is getting the cyl on top dead center to make sure the valves are shut and when you apply air the piston doesn't go down.The easyest way is to have someone turn the motor over at the crank on the bolt.And take a clothes hanger stick it in the cylinder intill its at topdead center. 
.People like that scare me.The tricky part is getting the cyl on top dead center to make sure the valves are shut and when you apply air the piston doesn't go down.The easyest way is to have someone turn the motor over at the crank on the bolt.And take a clothes hanger stick it in the cylinder intill its at topdead center. LS1 Tech Stories
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Your cranking compression is too low IMO. This leads me to believe the cam timing is off. Your torque doesn't fall off either. It stays flat. These are classic signs of your cams being too far RETARDED. Get a cam degree wheel and find out for sure. You may find you pick up lots of torque and cranking compression by advancing the cam 4-6 degrees. Try this next.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Originally Posted by Patrick G
Your cranking compression is too low IMO. This leads me to believe the cam timing is off. Your torque doesn't fall off either. It stays flat. These are classic signs of your cams being too far RETARDED. Get a cam degree wheel and find out for sure. You may find you pick up lots of torque and cranking compression by advancing the cam 4-6 degrees. Try this next.
Originally Posted by Michael Ozorowsky
Don, guys, can you tell me in idiot terms how to degree cam? I don't know how other than lining up the dots.
WOW that is a bit much for me. How much do you guys think would cost to have someone do this? Anyone from FLA area wanna help? It SHOULD Be a matter of just lining up the dots perfectly, shouldn't it? My only concern is the rollermaster double roller timing chain I put in, it only goes on one way right? You just put it on the crank one way and line up dots, right? Any advice you guys have I'm all ears, just can't afford to pay another 1K to fix this problem. Would almost LOVE to drop car off at mechanic at this point.
Originally Posted by Michael Ozorowsky
My only concern is the rollermaster double roller timing chain I put in, it only goes on one way right? You just put it on the crank one way and line up dots, right?
Teching In
Joined: Feb 2005
Posts: 7
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Rollmasters have 7 or 9 slots on the lower gear...Each in 2 degree increments like the Ford Motorsports gear sets. If you didn't degree the cam, it could easily be off 5-7 degrees in either direction..Judging by the torque and what I've read, I'd assume at least 3-4 degrees retarded.
TECH Junkie
Joined: Dec 2001
Posts: 3,242
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From: Lakeland, FL
Originally Posted by Michael Ozorowsky
WOW that is a bit much for me. How much do you guys think would cost to have someone do this? Anyone from FLA area wanna help? It SHOULD Be a matter of just lining up the dots perfectly, shouldn't it? My only concern is the rollermaster double roller timing chain I put in, it only goes on one way right? You just put it on the crank one way and line up dots, right? Any advice you guys have I'm all ears, just can't afford to pay another 1K to fix this problem. Would almost LOVE to drop car off at mechanic at this point.
You never answered the question what mode was Sams dyno in? Also like you said just drop the car off and have somebody check it or else use the degree wheel, no shame in asking for help at least you will get you car running right.
You got 3 choices really to figure out whats up.
1. Leakdown
2. Take cam out yourself and check with degree wheel.
3. Have the cam professionally checked out.
4. Check preload
Just pick a step and get started.
Originally Posted by Michael Ozorowsky
another thought: Could lack of fuel be the problem? IE Too small of injectors?
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.