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Board index » 1997-2008 Grand Prix Discussion » Supercharged 3800 L67/L32

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Sudden
PostPosted: Fri Jul 23, 2010 10:36 am 
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I think my next mod will be rockers. I've tried to read up on springs but I'm confused. ZZP has a warning about their 90# springs are GM LS6 yellow springs. "Because of the higher spring rate, timing chain dampener life is lower than with the 105's." My past experience is with V8s and i'm concerned with reliability on my GP. Does anyone who replaced springs have some good advice for me? TAI

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VictorSmalls
PostPosted: Fri Jul 23, 2010 1:24 pm 
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Don't use the yellow LS springs. I have seen more than one break on a L32/L26 motor. Go with the comp cams 105's

Depending on the ratio of rocker your gonna be using you may not even need springs. With 1.9 ER's ZZP states that you can use stock springs up to 6K. I am running 1.84 rollers on stock springs and shifting at 6200 I do not have a problem even at 15psi.

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Last edited by VictorSmalls on Fri Jul 23, 2010 1:37 pm, edited 1 time in total.

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Rodman
PostPosted: Fri Jul 23, 2010 5:41 pm 
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VictorSmalls wrote:
Don't use the yellow LS springs. I have seen more than one break on a L32/L26 motor. Go with the comp cams 105's

Depending on the ratio of rocker your gonna be using you may not even need springs. With 1.9 ER's ZZP states that you can use stock springs up to 6K. I am running 1.84 rollers on stock springs and shifting at 6200 I do not have a problem even at 15psi.

and thats weird i ran 1.84's and the push rods were beating the shit out of the rockers and was getting valve float after 4500rpm...

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VictorSmalls
PostPosted: Fri Jul 23, 2010 5:55 pm 
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Rodman wrote:
VictorSmalls wrote:
Don't use the yellow LS springs. I have seen more than one break on a L32/L26 motor. Go with the comp cams 105's

Depending on the ratio of rocker your gonna be using you may not even need springs. With 1.9 ER's ZZP states that you can use stock springs up to 6K. I am running 1.84 rollers on stock springs and shifting at 6200 I do not have a problem even at 15psi.

and thats weird i ran 1.84's and the push rods were beating the shit out of the rockers and was getting valve float after 4500rpm...


Never had a problem in mine yet. Rodman you just have the worst luck :(

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Rodman
PostPosted: Fri Jul 23, 2010 5:58 pm 
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this could be ture !!!

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Sudden
PostPosted: Fri Jul 23, 2010 6:47 pm 
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Maybe I'll get some rockers and see.

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'05 Grand Prix GTP Comp G. PLOG, 3" DP, ZZP PCM, K&N Drop in Filter, ZZP strut braces,
10.4 wires, cooler plugs, 3.5 dual SS tips, SPO Spoiler, 180 thermostat, ZZP MPS 3.6 pulley,
F-Body brakes, 18" Moda wheels with 235/50ZR18 Conti DW..
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Whiner04GTP
PostPosted: Sun Jul 25, 2010 6:22 pm 
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Nothing wrong so far with mine. #105's on 1.9's.

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Rodman
PostPosted: Sun Jul 25, 2010 6:30 pm 
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on a z7 turbo kit keep in mind....

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Whiner04GTP
PostPosted: Sun Aug 15, 2010 6:52 pm 
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Your turbo'd but I have Yella Terra Roller Rockers made in Australia, they run upside down.

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