666 speed

iTrader: (4)

I tried searching with no real luck.

My '04 throws the serpentine belt off when I shift at 6k RPMS or higher. I can run at 6k or higher and it doesn't throw the belt until I shift.

I've replaced the belt and tensioner. I've checked the pulleys.

About 2.5 years ago I did a cam swap. I'm certain the threads aren't stripped and the crank bolt was torqued to spec. Would the crank pulley be backing off? A friend suggested that may be the issue? It just started doing this recently.

Has anyone experienced this? I would appreciate any advice. Thanks.

RE AND CHERYL

iTrader: (31)

Unless your pulley alignment if off I would not suspect the crank. I have heard of this problem before, under high RPMs the tensioner can back off a lot causing slack in the belt. I can't rember who but someone makes a tensioner for the LS1 that does not have a spring and you adjust to desired tension adn tighten it down (GMHTP used one on a project car a few years back). Sounds like you need one.

Re'

666 speed

iTrader: (4)

Thanks for the reply!

Does anyone know who would make them? Thanks.

RE AND CHERYL

iTrader: (31)

Google is your friend...Comp Cams and Speed Engenering makes one, check out http://speed-eng.com/store/comp-cams..._479_3099.html

Re'

666 speed

iTrader: (4)

Ha, thanks. I was at work and didn't have time to google.

Thanks.

RE AND CHERYL

iTrader: (31)

Also I would get a high quality belt as they usually tend to streach less under the stress caused by high rpms.

Re'