Rear Main Seal Leak

Scoot-71

Apprentice
Nov 13, 2018
91
33
Rio WI
It's the Pontiac 265 which has a rope seal.
My bad, I never knew (until now) that Pontiac had a 265 cid engine, live and learn. I did research and found a 2 piece rear main seal for Pontiacs.
 
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Texas82GP

Just-a-worm
Supporting Member
Apr 3, 2015
7,036
113
Spring, Texas
My bad, I never knew (until now) that Pontiac had a 265 cid engine, live and learn. I did research and found a 2 piece rear main seal for Pontiacs.
It's all good. Pontiac's own true malaise era engine.
 
Oct 14, 2008
7,361
113
Melville,Saskatchewan
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jmcghee

n00b
Apr 13, 2020
4
1
I love how people are so fast to spend others money. No need to swap engines for rear seal leak Check with another shop.
 

CopperNick

G-Body Guru
Supporting Member
Feb 20, 2018
908
93
Canada
Try either Ames Performance or Butler Performance. They both specialize in genuine Pontiac parts and speed equipment for the 301-455 platforms. Seem to recall that there is an insert kit that will convert the rope seal to a neoprene or similar version. It is true that the rope seal is a pain in the *ss and has to be installed just so or it will leak. The builder has to be Anal-OCD when doing the job which is why a lot of shops won't go near it; too much time and patience for too little payback.



Nick
 
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Jim Rockford

Master Mechanic
Nov 10, 2007
262
63
Shelby,N.C.
Every 2 piece rear main seals leak. Its guaranteed thats the main reason I dont build any old SBC's , 87 and up are the best 1 piece rear main and roller cams.
 

Jim Rockford

Master Mechanic
Nov 10, 2007
262
63
Shelby,N.C.
U say your using 15w40 motor oil. I hope its not delo 400 or another diesel type oil. Very high detergent and can damage internal engine parts. Get a can of Lucas oil stop leak. Also 20w50 conventional motor oil. Try that. Should at least slow it down.
Please explain why oil would hurt the engine?
 
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