just a reminder fes are very different re the rear seal it is integral with the rear main cap,this makes for far better support for pan gasget. also the ys with the alum rear seal career,s at best a ropey solution as they are attached in such a marginal way poor support for the rear pan gasket.and most of the rear gasket is hanging in the  breeze. the retailing bots are visible  You are correct regarding the seal its self.

https://bestgasket.com/

  

Is there a website for Best Seals?  I've hit a dead end on finding those rear main oil seals.
Alan

I have had 100% good success with these modern split seals with the "nail" expanders. Been about 6 years since finishing my 64 292 block  with modified 312 crank and all is still dry.


64F100 57FAIRLANE500

Our moderator, Ted, has a section on his Eaton Balancing link from here, on proper installation of rear engine seals. Re the Chrysler seal retro fit, that was as I understand it a stop  gap method when 312 seals were unobtainium. That's not the case now, as Best Seals has two current seal methods for Y-Blocks including 312 " engines.  Check it out. Following directions carefully is apparently the key..


Paul

I don't have any problems with oil leaks, I've built these engines for over 40 years, the real seal is the same setup as an FE Ford or Chrysler, it just comes down to good building practices, the real seal I use is a felpro for the little engines and the chrysler seal for the 312 (felpro), I never use felpro head gaskets (water stains down the sides of the block).

Y Blocks are prone to leaks.  They leaked oil 60 years ago and they leak oil today. I'm convinced you could coat one of these engines in epoxy and it would still leak. That said, my bottom oil pump plate bolts were loose. My rear seal is OK for now, but I'm not getting cocky.  If you want a car that doesn't leak oil, buy a Tesla. 

oil leak  at oil pump. i have chased this rear seal ,valley cover oil pump leak situation,especially my 292 in 49 mere truck.
i now am surer that the issue is the rear of the oil pan. with a drip oil leak out of rear of pan is blown onto the oil pump,makeing 1 think it is the issue.after laying a oil pan on a bare block with rear seal holder in place  it becomes obvious that henry screwed up big time on such a easy improvement could have eliminated  the ability to mark her spot. the rear seal bracket hangs out from the gasket aria to a point the pan gasket is only hang on by a small margin.. the seal retaining bolts are visible. i am in the process of extending the pan contact at rear,also making plastic covers to go over the bolt heads the gasket has a decent contact,as well as a plate that goes over the bolt holes and presses more support to that aria of the pan to block. actually the studs and nuts attached to seal bracket at not much good as they squeeze the gasket  at a era that has poor contact.  i have suspected valley cover leaks oil pump leaks, rear seal in my case it is the oil panther leaks at the rear,more so with truck and third rear sump pans

Ditto 





54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Noted.  Thanks.  Right now the leak is very small.  When the new gasket comes I'll take a closer look.