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petefias · 10-24-2006

Did you check the compression in 2, 4, and 8? Are they good? If 6 has good compression without the covers the answer is in the valvetrain.

My guess is that the camshaft is broken, I know it doesn't make much sense. Maybe with the valve cover installed there is too much drag on the cam and won't turn, with the cover off it just turns enough to run.

Another possibility is what was suggested before: the lifters/pushers are "overextended". With the cover off the cam lifts off enough to not matter.

Good luck and let us know...

10-24-2006	#10
petefias Join Date: Aug 2005 Location: Lancaster, PA Posts: 147	Re: LT5 technical problem Did you check the compression in 2, 4, and 8? Are they good? If 6 has good compression without the covers the answer is in the valvetrain. My guess is that the camshaft is broken, I know it doesn't make much sense. Maybe with the valve cover installed there is too much drag on the cam and won't turn, with the cover off it just turns enough to run. Another possibility is what was suggested before: the lifters/pushers are "overextended". With the cover off the cam lifts off enough to not matter. Good luck and let us know...