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Ive got a sbc with 2 piece rms im looking at buying a used oil pan
How do i tell without fitting to my block if the pan is to suit 1 or 2 piece rms?
Thansk
 

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EFI/N2O JUNKIE
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Not sure if the measurements are published somewhere, but the rear of the pan has a much larger opening for the 1 piece rear main seal compared to the 2 piece version. I have a 1 piece RMS pan in the garage I can measure but don't think I have a spare 2 piece RMS pan around here right now.
 

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5 1/4 wide for the 1 piece seal opening vs about 4 3/8 for the 2 piece if I recall.
 
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