Advice on HP500 upgrade
#1
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Advice on HP500 upgrade
I got my HP500's on the floor for winter refresh and was thinking about upgradeing the cam to a bigger one.I am torn between using my stock cam and going to a 1.8 rocker which would bring intake lift from .576 to .610 and exhaust from .598 to .633. or buy an aftermarket cam thats vertually the same. The money for cams about $275. each and rockers are about the same. any input or advice would be appreciated.
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With just 1.8 rockers your lift will change but not you duration, i would call bob like said above. I put a 741 crane in mine last year with some head work as well, and i would replace springs for sure on the 500hp.
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Higher ratio rockers may require that you open up the pushrod hole in the heads. Higher ratio rockers can also be a little harder on valve spring. The higher ratio has a faster acceleration opening rate on the spring. Like the others said it only changes the duration a few degrees.
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The crane 741 was what I had in mind for an upgrade. Do you like the performance gain? does it perform well with stock compresion. did you upgrade the springs from the stock 929's or just put in new ones?