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OPRV interchangability between early and late blocks?
OK, another detail crossed my mind in trying to get ahold of a short block is OPRV compatability. I'm pretty sure I've seen there are like 4 different versions of the OPRV, 2 3 piece versions for the early blocks, and 2 one piece versions, one to retrofit early blocks, and one for late blocks.
My car has a one piece OPRV, but how the heck to I tell whether it's the early or late style, and will it work in an early block (I'm looking at a couple of blocks, all '84s). Or will I need to make sure I get the OPRV from the block, in which case, how problematic are the old 3 piece parts and how do I tell if it's the old version prone to corrosion or the updated 3 piece part.
Oh, and I assume the oil pumps are compatable between early and late, but they might not be!
Thanks!
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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