[6spd_EK]

I'm using a wiseco 13.7 off the shelf piston wit drag cartel cams stage 4. And I'm having no problems. And that's a big cam.

the shelf wiseco 13.7cr (89mm) have valve relief's of .235" int & .170 exh (below Timing Edge ie TE) with the ability to increase that to .265" int & .200" exh. how much clearance is needed to run the ips cams? .290" int???

on a side note you can see some possible characteristics of custom pistons here http://www.cppistons.com/products/custom_pistons/index.html

 

[6spd_EK]

the only way to tell is to measure it.

I realize this - claying a motor is a must.

Because I can't find out I am trying to sell the pistons in favor of custom ones with .290" int .220" exh but I am just guessing LOL