Fox Rear Main 1 Or 2 Piece

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Older 5.0's had the 2-peice, and the newer ones went 1-peice. I beleive the 1-piece will retroactively swap into older cars though...not sure.

If we knew the year of the 302 in question, we could give a better answer. If it's a '87 or later, definitely 1-peice. Not sure when the swap to the 1 peice happened, but i wanna say early. 1984ish?
 
I know it's somewhere around there. I know Chevy updated their small block in 1986; maybe that's where I'm getting that date from. I know the two seals are not interchangeable. The local engine builder offers the service of updating the older engine to a one piece design by machining it some how.

Kurt
 
Older 5.0's had the 2-peice, and the newer ones went 1-peice. I beleive the 1-piece will retroactively swap into older cars though...not sure.

If we knew the year of the 302 in question, we could give a better answer. If it's a '87 or later, definitely 1-peice. Not sure when the swap to the 1 peice happened, but i wanna say early. 1984ish?
1990