MCG Article /// Fast Fish Auto Parts Rear Main Seal

Anyone know if the one piece rear main seal from Fast Fish Auto Parts works well or not? I see the article in the May 2015 Mopar Collector Guide on page 14. It's supposed to work with Mopar 361, 383, 413, & 426 wedge motors as well as the 440's and of course the 426 hemi engines. The article says this one piece setup is supposed to cure the rear main seal ills, but I just want to ask those that really know if this is true or not? If this one piece rear main seal really works, then this would be great, but it would be good if anyone has any practical experience with these, good or bad.

Hmm

https://www.facebook.com/Fastfishautoparts/?__xts__[0]=68.ARCK5bxkvIpVcfRkoheYDure3-VrGyNehnkaeeN7aTRXv0sRE40Wk9nnj-13Vpzqgqst7yv9951LXJ0Y-62DZy6mkfAoWvG3TPufvnc_GCcZmtjHqCTzU4l1P_9aBy4moUGj3oa_gjXj6iYlLw7fpd6_LfcIxKT7U-Mki5cXKBNRPsv1cJLywQPmhoHQ1az8b5zpYJYp7-BezM2lu0K7Q5P403G1rjk5hpZBRnZIIeOk5rGwIUPuzJCIUu_dpHgQRYqMsjjktL1x5eI0WIsyCpO7rvbDgPk


https://www.fastfishautoparts.com/store/p_1204441/big-block-mopar-retainer-and-seal-package-


I had never heard of this before so . I went and look it up.. Interesting

I bought one several years ago, but I was unable to get the seal in to my satisfaction. I was almost like the seal was too large, kind of like 6" of seal to go into a 5 3/4" hole. Still on the shelf in the shop. $60 waste in my opinion.

Brian

there is no way I would try and stretch a rear main seal over the crankshaft flywheel, flexplate, mounting flange
My luck is no where good enough to be able to get away with using a seal like that
I haven't had a rear main seal leak on a BB or gen 2 Hemi motor in a long time

Instructions have YOU cut the seal on a diagonal. Don't know why they don't cut before they send it to you.

Brian

So when it leaks, it's obviously the installers fault.

Most of the engines we build now get that one piece seal. They work great when they work but some engines are so poorly machined from the factory that you have to use a rope seal. The rear main is a constant issue with Mopar big block engines. The factory never fixed that design. Ford and GM engines all got fixed over the years but Mopar never fixed it before the engine went disco.

I'm running the Fast Fish retainer and seal in my 512 build. No leaks so far. Matt Hensley who did my machine work. Had never tried one. Said he liked it and wouldn't have problem using one again.

Yeah we use them with a good quality billet retainer and they work great as long as the block was properly machined. But 50 year old OEM blocks are hit and miss at best.

What happened to superperformace rear main.html#Post2906211Seal post