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First off, sorry to bring up old stuff. I'm just about to button up my engine build and am somewhat confused as to which oil pump pickup o-ring to use. I'm using a pan and pick up from a GTO for my swap. After all the research I did, I'm still confused, however, I'm pretty sure I need to use the thinner of the two o rings. Being this close to finishing, I don't want to mess up here. Here's a pic of my pickup.
Any reason behind why GM made 2 different oil pickup tubes with and without an indent? Seems it would have taken all the confusion out with 1 style tube and 1 o-ring.
Any reason behind why GM made 2 different oil pickup tubes with and without an indent? Seems it would have taken all the confusion out with 1 style tube and 1 o-ring.
Any reason behind why GM made 2 different oil pickup tubes with and without an indent? Seems it would have taken all the confusion out with 1 style tube and 1 o-ring.
INSANITY, I suspect the engineers were snorting crack when they put a ORING in dirty nasty acidy engine oil. Seriously I don't snort crack and I wouldn't think of it. This oring and the unsealed windshield cowlings have destroyed more engines than you can imagine.
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Oil pump pickup o-ring 
