LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How much lift can stock valve covers support?

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Old Sep 28, 2003 | 10:26 PM
  #1  
Spinner's Avatar
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From: Fort Benning, GA
How much lift can stock valve covers support?

I'm going to go with a CC306 cam, as it's about as high as I want to go for a street driven cam,

Lift on it is .510 and .540, but I'ma lso going with 1,6 ratio rockers for a higher lift.

So that puts me (around) .540/.570

Will I have clearance issues with stock valve covers? Here's my parts list

(Summit CCA-07-306-8) 306 Cam - $240
(Summit CCA-987-16) 987 Springs - $85
(LS1Speed CC1318-16) Pro-Magnum 1.6 Rocker Arms - $290
(Summit CCA-611-16) Valve locks - $26
(Summit CCA-503-16) Valve Seals - $25
(Summit CCA-740-16) Valve Retainers - $60
(Summit CCA-621-16) Valve Lash Caps - $35
(Summit CCA-7940-16) Chromoly Pushrods - $136
Total - $897 + Shipping
Old Sep 28, 2003 | 10:36 PM
  #2  
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From: Falkner, MS, USA
The valve lift won't be a problem, but you may have to do a little trimming to get those roller rockers under the stock valve covers. I did on my Stepson's '94 Formula. Not a big deal...it just took a few minutes with a pair of side cutters and a sinister, destructive grin on my face
Kevin
Old Sep 28, 2003 | 10:41 PM
  #3  
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I've got a cordless dremel and more type of cutters then you could imagine here, dont think that will be a problem then
Old Sep 28, 2003 | 11:25 PM
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atljar's Avatar
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From: Cincinnati, Ohio
Just as he said above. You have to make the center supports for the valve covers flat all the way down, so at the bottom they dont flare out parralel with the head. (Will make sense once you see it) Otherwise they wont slip between the rockers.
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