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Old Nov 15, 2011 | 02:50 PM
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Default Valve Float
Ok i have a Stock Cube LS1(5.7) carb set up it has
Vic jr intake
Trickflow 225 heads
Yella Tera Rockers
23x/23X comp cam
Gm lifters (GM Performace Part #12499225)


Problem is that if i shift anywere about 6200 RPM's the car slows down. Its like i can feel the power fall off. Anyone had any problems like this or know what to look at first. Heads, Cam, and lifters are only about 3 months old.
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Old Nov 21, 2011 | 01:31 PM
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What is the min and max preload on the GM lifters Part #12499225?
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Old Nov 21, 2011 | 02:01 PM
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From: montebello 90640
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i would say check your valve springs and see if they are rated for your cam. you might need stronger valve springs to keep your valves closed.
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Old Nov 21, 2011 | 07:39 PM
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Throw on stock rockers and try again......
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Old Nov 21, 2011 | 07:58 PM
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Originally Posted by neals98
Ok i have a Stock Cube LS1(5.7) carb set up it has
Vic jr intake
Trickflow 225 heads
Yella Tera Rockers
23x/23X comp cam
Gm lifters (GM Performace Part #12499225)


Problem is that if i shift anywere about 6200 RPM's the car slows down. Its like i can feel the power fall off. Anyone had any problems like this or know what to look at first. Heads, Cam, and lifters are only about 3 months old.
What jets are you running in the secondaries?
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Old Nov 21, 2011 | 10:07 PM
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Change gear faster & back on the gas ....What valve springs are you running?
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Old Nov 22, 2011 | 11:43 AM
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Originally Posted by senor_camaro
i would say check your valve springs and see if they are rated for your cam. you might need stronger valve springs to keep your valves closed.
Thats one of the things i am looking at now. Mine are 142# closed and 375 open.

Originally Posted by SweetS10V8
Throw on stock rockers and try again......
I have one more race this year and thats what i am going to do. After this race im pulling motor to freshin it up and check everything.

Originally Posted by crainholio
What jets are you running in the secondaries?
Its a new pro systems carb with 76/86 jets.

Originally Posted by ls1 1990 VN
Change gear faster & back on the gas ....What valve springs are you running?
LOL thats what i have been doing. Its the springs that came on the heads. I dont think they have enough open pressure for my cam with the YT rockers.
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Old Nov 22, 2011 | 01:19 PM
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Do you know what lobes the cam is ground on?
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Old Nov 22, 2011 | 01:46 PM
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From: montebello 90640
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you should check the cam manufacturer specs for what kind of valve spring to run on the cam. easy fix that should get your power on!!!!!
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