"...The pistons are forged Oldsmobile pistons that were reasonably priced..."
So, that brings up the question of what rods you used ?
Looking at forged 455 Olds L2323F30 pistons. They have a 1.735 pin height. That's more than 400 Pontiac pistons. But, the Summit pics show these to have a center marking which your pistons don't appear to have.
https://www.summitracing.com/parts/s...ake/oldsmobile
They look different on Amazon.
https://www.amazon.com/Sealed-Power-.../dp/B01BNX1K4W
The cast SP pistons are smooth like yours, & have a 1.725 pin height. Just wondering if there is some other brand of cheap forged 455 Olds pistons.
https://www.summitracing.com/parts/s...ake/oldsmobile
So, for you engine builders, when using stock length 6.625" rods, how much pin height can you get by with, without the top of the piston sticking out of the hole ? This is assuming no more than a minimum deck square & clean-up cut. I ask this because most of the stock replacement 400 cast pistons I've seen have a 1.700 pin height. And, many say that some Pontiac engines came with about .023 deck height. So, if a 1.700 piston has a .023 deck height, by my math, that would put one of those forged L2323F piston tops .012 above the deck(assuming factory stock stroke). So, does anybody know FOR SURE, exactly what the pin height of a factory 400 Pontiac piston was ?