No super light hi tech stuff ... Jsta something mostly hp street or bracket. Any DEALS out there on doing a big run ? And what would they consider a big run ? Can a basic piston be made(bore size) and leave the ring size and placement AND pin size and location be left up to a later date

Most have all been bought up/merged by major investment corps. They are all about the same quality until you get into the custom Billet stuff and most all use Total Seal Rings anyway.

TRW, Fed Mogul, Sealed Power & Fel Pro are all owned by Federal Mogul.

JE, Wiseco, CP/Carrillo are now all owned by PMI (Performance Motorsports International)

Diamond Racing, Gibtec, Trend, Dart are now owned by Race Winning Brands.

So the FM people do "custom" stuff ? They once made these parts but it's long since been out of production

Can a basic piston be made(bore size) and leave the ring size and placement AND pin size and location be left up to a later date

Probably, but there will be a weight penalty from extra material to move the pin around, etc. Smaller "window" of specs: less extra weight.

United Engine & Machine, Has been making pistons since 1923. They are 4th generation family owned. They are KB pistons, Icon pistons and they make after market cast pistons. Plus one of the largest diesel piston manufactures in the world. The Icon line which is their forged piston line are off the shelf pistons or custom racing pistons.

polyspheric, as for your question. It would not be practical to turn a piston to size and then do the ring package at a later date. Would be almost impossible to get the ring grooves and the ring lands all concentric. Which is very critical for proper function. I would suggest you call or go to Icon pistons web site. www.uempistons.com Or call1-800-648-7970

If I was going to order non-standard config pistons today, the first company I would call would be Race Tec / Auto Tec in SoCal.

Not sure who my second choice would be, especially since the cost of pistons has skyrocketed so much since the last set I bought new.

IIRC Diamond will let you make two changes before it becomes a "custom" piston. Call them, good people to deal with.

It would not be practical to turn a piston to size and then do the ring package at a later date. Would be almost impossible to get the ring grooves and the ring lands all concentric

Bill Jenkins did this with TRW blanks 45 years ago.

Pistons today start as a standard forged slug and then with CNC machining become very custon - these CP pistons are a total custom design - but came from a common stocked forging of the piston manufacture - it's all in what you want - just the price goes up the more custom you want.