I called Jim Pace performance today and they did not know the info. I hunted the internet and no success.
Can someone inform me on the ZZ502 cam (GM 12366543)spec, particuliarly:
IVO
IVC
EVO
EVC

Thanks - Gary

224/234
527/544
110lsa

i can double check that in the morning.

BY U BOY - I was looking for the spec on the intake valve opening and closing plus the exhaust valve opening and closing which usually comes on the cam card.

Anybody out there know this?

sorry i quess i did not fully read the post.

I will check my ZZ502 file. I may have that opening/closing degree numbers. Are you looking for a stock ZZ502 cam?

12366543 Steel Hydraulic Roller
This steel roller is for 502/502 special engines. (Must use distributor gear P/N 10456413.) The duration at .050” tappet lift (intake/exhaust) is 224/234; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 527/544. Valve lash is zero/zero and lobe centerline is 110 degrees.

As stated. Thats all I can find right now.

Pwrbt33 & Rotax 454: I have them in my 502's and am suffering from reversion. I am trying to find out the:
IVO
IVC
EVO
EVC

Does anybody know this? Thanks - Gary

If you cant find a cam card have an engine builder put a degree wheel on the front of the engine and check it that way!

Gary, As PWRBT33 wrote, that's what I did to find out the timing events for that cam, when I had the ZZ502 in stock trim. I just have to locate the sheet that I documented those numbers. I do have a special cam that was designed for the stock ZZ502 for marine use. It was designed to help stop exhaust reversion, and develop some additional HP and torque. Dyno results show this to be true. I do have the cam card on this special cam. Is this a single or twin setup?

GNJ,

This should help.

Bob