1 or 2 piece rear main seal with supercharged motor?

F

fox3streetracer

Member

Jul 6, 2003

195

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16

ocala,fl

Dec 2, 2007

#1

• Dec 2, 2007

• #1

i am building currently a 410w with a 1974 351 block with 2-peice style seal.this engine is going to see roughly 10-12 psi boost from a vortech.was wondering if it would be worth machining the block for a 1 peice rear main seal,or if a double lipped 2-peice seal will seal as good as the 1 peice under boost?

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Dec 3, 2007

#2

• Dec 3, 2007

• #2

The 2 pc rubber seal shouldn't be an issue, installed correctly I find they tend to leak a lot less then the 1 pc at times.

If your going to run a vacuum pump I would machine it for a 1 pc seal, and use a double lipped 1 pc.

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

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99

Arkansas

Dec 3, 2007

#3

• Dec 3, 2007

• #3

Rick - Are the "double" lipped one piece different than a typical one piece rear main seal (one lip right?)

I am curious if a double lipped one piece would be good for someone wanting to change out their rear main seal.

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Dec 3, 2007

#4

• Dec 3, 2007

• #4

5spd GT said:

Rick - Are the "double" lipped one piece different than a typical one piece rear main seal (one lip right?)

I am curious if a double lipped one piece would be good for someone wanting to change out their rear main seal.

Click to expand...

Yes they are different....