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Comp xr275hr

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Old 06-03-2008, 01:10 AM
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I have no numbers but this cam is what I expected. As the sales flyer says strong midrange and excellent topend. This is an odd install because of the stock exhaust manifolds. Lots say its a no no, but at 100kmh and 1800rpm is still easy when the truck is empty... and at 6500rpm power has not peaked. I used the yellow GM springs so lets not push too hard, yet. After dialing in the transmission every shift is where I want it, except when I want the standard clutch of a manual. In hindsight I should have bought a 4.8 5spd
BTW The 1-2 shift at 6500 is 85km. 50mph?

I'll find a videohandler and in the mean time let PCM to its own fine tuning.
Old 06-03-2008, 01:56 AM
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aren't yellow LS6 springs only rated to .550 lift?

That is what i've read, which is why I'm going to run them with my .525 .532 cam

I would've probly gone with Comp 918s if I were you man, just to be on the safe side.
Old 06-03-2008, 08:17 AM
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Originally Posted by 00ChevyScott
aren't yellow LS6 springs only rated to .550 lift?

That is what i've read, which is why I'm going to run them with my .525 .532 cam

I would've probly gone with Comp 918s if I were you man, just to be on the safe side.
Correct. That's what i'm running with mine.
Old 06-03-2008, 12:39 PM
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money money money makes the world go around

I want to dig back under the valvle covers to check the rocker arms. What did GM use to lock the rocker bolts in place. I don't think lock tight in aluminum is a good idea.
Old 07-07-2008, 07:07 PM
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i have this same cam what pushrods did you got with????????
Old 07-07-2008, 07:15 PM
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Originally Posted by 05GTO6SPEED
i have this same cam what pushrods did you got with????????
the 7.400 work fine on this cam..
Old 07-07-2008, 07:57 PM
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ok one more thing do i need the 5/16 or the 3/8, and what else should i buy for the cam install (i already have 918 springs), yes ive searched, just havent found what im looking
one more thing this is for a 5.3 not the ls2
thanks
Old 07-07-2008, 08:02 PM
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Originally Posted by 05GTO6SPEED
ok one more thing do i need the 5/16 or the 3/8, and what else should i buy for the cam install (i already have 918 springs), yes ive searched, just havent found what im looking
one more thing this is for a 5.3 not the ls2
thanks
5/16
I used part number CCA-7955-16 thru summit racing.
Old 07-07-2008, 08:08 PM
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so i have the springs and the pushrods, and the gaskets. thats all im going to need?
Old 07-07-2008, 08:11 PM
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Originally Posted by 05GTO6SPEED
so i have the springs and the pushrods, and the gaskets. thats all im going to need?
That's it.
Just make sure you have a tool to change the springs, and some dowel rods to hold the lifters so you don't have to pull the intake.


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