Oil leak

[VileZambonie]

degrease it and put dye tracer in it. Use a UZ light and yellow glasses and you'll find it. Typical leak spots are

Intake, valve covers, distributor, oil sending unit, oil pan, rear mian seal.

[Irish_Alley]

The pcv is ok. most time they blow out at the rear of the intake I just redid mine two days ago cause it was leaking out faster than I could put it in and I was leaving a smoke screen behind me but it seams to have fixed the problem be for I used the high temp gasket sealer(red stuff) and I did this time but when I took my intake off back passengers side didn’t have any resistance at coming off and the sealant that was on the intake was not stuck to anything just sitting there so that seams to be where mine was leaking from. Just clean it good a razor blade then with a rag with some brake cleaner on it

[zimcocomp]

Hi. I am new to the forum and I have a question about the rear main seal. I have a 1986 silverado with a 350 and it appears to need a rear seal. The problem is, when I try to get an estimate for the job it seems no one is quite sure if it is a one piece or two piece. The one piece is very expensive to replace and the two piece is much less. Anyone know of a sure fire way of telling which it may be?

Thanks

[beastie_3]

run the block casting number.

[Lt.Del]

driver's side oil dipsitck or passenger side dipstick?
I 'believe' that the two piece rear main seals, which do not require removing the transmission, has the dipstick on driver's side.  My '79 is that way.  The 86 and up, dipstick on passenger side, has the expensive-changing one piece. 
Someone please correct me if I am wrong, but I think this is the case generally.

[TexasRed]

I think the 80's started the passenger side dipstick. My '84 two piece is like that and so are the later model ones.

[beastie_3]

Correct on the dipstick year, 79/80, but I think the main seal changed later on.

[screamin86]

I believe the 1pc rm started in 86 maybe 85

[Lt.Del]

86 and up one piece.
I thought the dipstick changed sides then too, but, i guess consensus shows that changed in '80.

[nativetexan]

So I re-did the intake seals, and replaced the nipple for the oil sender with one from the salvage yard and it held for a few weeks. I was under there today and, it is still leaking. oil in all the same spots. I will say it slowed down as it is not dripping, but the oil is there nonetheless. What to do. Not to mention, my current tranny issues, kinda making me wanna throw in the towel and find another one...

[VileZambonie]

degrease it and put dye tracer in it. Use a UV light and yellow glasses and you'll find it. Typical leak spots are

Intake, valve covers, distributor, oil sending unit, oil pan, rear mian seal.

[nativetexan]

Alright, Alright...