[J.C.you]

Originally Posted by PAUL K

Any "shelf" style piston such as Icon, TRW, Sealed Power, Keith Black, Auto-Tec, DSS, Wiseco, Diamond, CP Bullet, JBP/Ross.

A good number of these pistons will not allow the use of a 1.77 valve in an Edelbrock RPM head or Kaufman Hi-port. They're designed for factory valve spacing and 2.11/1.77 valves. Some of them might accept a 2.20 valve but things are going get real close when one uses a 2.19 valve and starts moving it around.


I posted a picture of what had to be removed from a valve pocket on an aftermarket piston designed for a Edelbrock head using a 2.1250 valve. It shows the amount of material needed to allow for a 2.18 valve offset .050.
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It’s called hot rodding 101. Nit picking in my opinion. That type stuff is minor. Cleaning up a valve pocket.
If I wanted a set of faux pas aluminum 48s for instance to get 75-100 more hp out of my combo making a 2 gram cut on a valve relief wouldn’t nix my decision to buy the aluminum 48s. It’s not like having to install new pistons and rebalance.