mopar1rules Posted May 5, 2008 Report Posted May 5, 2008 (edited) what should the piston/cylinder clearance be on my bored .040" over cylinders? like .004" to .006"? i tore my top end down tonight, to check to see if my ports were chamfered after the .040" over bore, and sure enough they weren't. i also noticed some slight scratches in the cylinder wall, and on the intake side of the pistons. you can't catch your finger nails on them, so they are mainly cosmetic. it seemed to me like the piston was expanding and making contact with the cylinder wall. i measured the bore and it was only like .002"-.003" over the pistons 2.565" measured size. i don't know if the lubrication was wiped a little bit off the pistons skirt, from the ports not being chamfered. the only good thing i seen was that there was no blow by on the pistons. the rings really seated with the amsoil dominator that i use. oh yeah, these are pro x pistons if you guys want to know. i don't know how many hours are on this engine, but the reason i tore the top end down, was cause another fellow on this site had his engine go down, and his ports weren't chamfered, and that got me thinking about my top end. i didn't recall seeing any chamfering on the ports. good thing i tore the top end down. Edited May 5, 2008 by mopar1rules Quote
Wildcardracing Posted May 5, 2008 Report Posted May 5, 2008 Not sure on the Pro-X specs, but Wiseco recommends .003" clearance... I like to set mine at .0035" on a fresh bore. Quote
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