I have a guy that has a head ported by rs machines w/ oversized valves he cant get info until later tommarow couse he has no paperwork on it! can i use this head with my jdm itr pistons 11:6:1 comp with my sk2 pro 1 cams will i have any problems using oversized valves with these pistons im currently running standard size in the current setup any help would be great!!

 

yea i dont see why not

 

Make sure you check v2p and v2v clearances so that when you tune your cam gears you know maximum adjustments you can make before your valves hit each other or the piston.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wunfstgsr &raquo;</TD></TR><TR><TD CLASS="quote">I'd like to buy a head some guy is selling that was ported by rs machines. It has oversized valves in supposedly. Unfortunetly he cant get me any info on it until later tomorrow because he says he has no paperwork on it! Do you guys think it would be safe to use this head with my jdm itr pistons? I think I'm at 11:6:1 comp. I also have sk2 pro 1 cams. Will i have any problems using oversized valves with these pistons? I'm currently running standard size valves in the setup I have now. Any help would be great!!</TD></TR></TABLE>

Fix't

 

sk2 does not recommend running over-sized valves with their cams. why? i don't know. i would talk to sk2 or a dealer before going with pro ones.

 

The Pro Series camshafts feature rather tight valve separation. When used in conjunction with oversized valves, this generates even tighter valve to valve clearances. This is why Skunk2 does not recommend using oversized valves with the Pro Series camshafts. We do not state that you CANNOT use oversized valves, but rather state that we recommend against it.

In addition, ITR pistons have shallow valve pockets cast into the face of the piston. A large performance camshaft with oversized valves and pistons with shallow valve pockets is a recipe for tight valve to piston clearance as well.

Degree in your Pro camshafts, and then carefully check your v2v and p2v clearances. If everything checks out you are good to roll.

 

Thanks man! i ended up not getting it and running my gsr head got my big tube hytech replica header on and welded it the sp2 catback next week im throwing in the pro 1's and tuning it over at churches i'll post a couple dyno's i hope to hit 210-215hp! on there dynapack..