I plan on using this is my boat. Marine engines have to run high rpms for long periods of time. I need to use something that will hold up. Now, since the original is cast, and this forged crank it should at least hold up as well... I will probably go for a stroker kit that is all there, crank, rods, pistons etc. And, it looks like you can buy a balanced kit right from CAT...

Anyhow, I think i have a 1 piece main seal since my engine is 1991... I will have to uncover the boat and crawl into the engine compartment to try and find some numbers.