1 or 2 piece main real seal in a 1990 GMC Sierra with a 350?

sniperlif3

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I have a 1990 GMC Sierra with a chevy 350 small block that i am looking to get rebuilt either stock 350 or maybe even turn it into a 383 stroker but i really need to know if my engine is a 1 or 2 piece main real seal?
Where/what exactly does this represent in the engine?
 


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