I have pro2 cams but they say u cant run them with oversized valves, i was just wonder what are the biggest and best cams i can run with oversized valves?

 

take the head off - lock vtec and install cams on the head. lock it to a bench, strap the cam gears together with an old timing belt and crank your cam gears until the valves touch. you will know when you cant move anymore. be sure to think about expansion experts correct me - wouldnt it be like .003-.004 per valve? this would move the valves like .007-008 closer together no doubt. also they would be that much closer to the piston being larger, so more than likely you would want to get the pistons notched - especially if you plan on milling the head. just some food for thought depends on the application, however I have heard guys that build motors for reliability on the street or RR/AutoX and they like .030 between the valves at least... depending on the cam I wonder if you could get the valve timing in the right spot with the bigger valve?

 

well im runnin je pistons so if im correct the valve guides are bigger already. my cp is about 12.5-1 after having my head milled twice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MikeSarr_GSR &raquo;</TD></TR><TR><TD CLASS="quote">...depending on the cam I wonder if you could get the valve timing in the right spot with the bigger valve?</TD></TR></TABLE>

well as long as you degree the motor...you shouldn't have THAT problem. you can try claying the motor...you'll see exactly where your valves hit and find how much room you have, then subtract for expansion. IMHO the gain you might get from running larger valves will be negated by lack of adjustability. What's more important is the valve job/cut/angle.

 

yea i know i can clay test the motor but i was more of looking to see what cams i can run without aving to worry about any real clearnace issues like maybe some pro1s ?

 

I was having the same issue with mine. i had new valve guides 1mm larger valves, Valve to valve clearence was pretty close. I had to adjust the cam gears to be safe with my type r cams. I wanted skunk 2p cams but There was just no way after claying that they would have any margin for error at all. Although all castings are a little diffrent. The best thing to do would be to borrow someones skunk 2 stage2 and check valve to valve and degree ,