Are the 383 and 440 rear oil seals the same?

[Kern Dog]

Looking on the Rock Auto site, it lists the Fel Pro 40240 rear seal kit as the same for both series of engines. I thought the B series had smaller main bearings. I guess they shared rod journal sizes and rear mains too ?

 

[Kern Dog]

Hmm......
https://www.summitracing.com/parts/fel-bs40240
I don't know how I forgot this....That the slant six used the same rear oil seal retainer!

 

[Dajkzo]

Yes it is. The bearing surface for the seal is not contiguous with the rear main journal. . A bigger question is, which seal kit is the best????

 

[Durandal25]

Yup, it is sir

 

[Darter6]

Yes the Slant shared the same as the Big Blocks. Tough little buggars !
The extra seal pieces in the seal kit are for the Slant and not used in the Big Blocks.

 

[gooser]

i would use the fel-pro viton rear main seal #2947

 

[66Satellite47]

Main seal the same size, not he main bearing size.