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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
 
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