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Originally Posted by J.C.you
Define “production pistons “ are you talking about oem stock pistons?
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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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