08-22-2015, 04:12 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Quote:
Originally Posted by blykins
252/262 @ .050"?
If that's duration at .050", that's a very large camshaft for a 427. My engines that are around this displacement and use hydraulic rollers have about 12-14 degrees less duration and peak at around 6000-6200.
My guess is that the cam has been changed sometime in the car's life and that cam does not match the rest of the engine/car/goals. Your compression test shows low because the cam is so large and the numbers actually jive for a cam that large.
I'm thinking that if these are .050" duration numbers, the cam is so big that you have no bottom end and you can't run high enough in the rpm range where the cam wants to be efficient.
If those numbers are advertised duration numbers, then that would be a tow truck cam....
I'd change the cam....
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Yes, I agree also.
Either the specs the OP has quoted are incorrect, or the cam is way too big or way too small for the expected outcome.
__________________
Gary
Gold Certified Holden Technician
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