More swap bad news

[slow91fj90]

Well I had a oil leak coming from rear of pan. I new when I put the motor together I should have used a 1 piece rubber oil pan gasket in stead of the multi piece I used. Well I replace last night with a good one and still have a pretty good leak. Looks like it might be my rear main seal. Gonna pull the converter shield and have a better look. Damn I need a cold one

 

[Explorer]

You're not alone. Got the same leak, hoping I screwed up the one piece gasket.

 

[01JLH]

Guys, Make sure you look at the back of the heads and see if oil is coming from the valve covers before you work too hard at rear main seals and pan gaskets. They are notorious for valve cover leaks and they look just like pan gaskets or rear main seals on bottom.

 

[blubuckaroo]

I've seen more one piece pan gaskets leak than with the multi piece cork. One problem is that there are a couple different one piece gaskets available. One for 302s and the other for 5.0s.

 

[KRAWLER]

Agreed, check the valve cover gaskets. Mine leaked like a sip. Replaced rear main seal. Still leaked. It was running out of the valve cover gasket the whole time.

 

[Explorer]

Looked mine over real good. Valve covers are fine, looks like pan gasket is leaking about 10" from the rear on drivers side and running to the rear. Sure hope thats the source, can't imagine it running up hill. Anyone ever stud the pan instead of bolts? With the body lift I've got plenty of room to drop pan.

 

[Broncobowsher]

I have botched intake installs before. Oil pours down the back of the block (looks like a rear main leak) when you drive it. That gasket at the back of the valley where the intake has a gap to the block. I even screwed that one up with straight RTV. Impossible to see and leaky. I have found reasons to put the intake on an engine out of the truck just so I can see that I have that spot sealed right.