Rear main seal

[68Zproject]

On an older thread JohnZ recommended a fel pro 2912 rear main seal.  I noticed there is a 2909 that says its the same seal and is $16 less.  Is there a difference in these two?

[JohnZ]

On an older thread JohnZ recommended a fel pro 2912 rear main seal.  I noticed there is a 2909 that says its the same seal and is $16 less.  Is there a difference in these two?

Yes, there is. The #2900 is a standard silicone seal, and the #2912 is the same seal made from a premium fluoroelastomer material. There's also a #BS-118291 offset double-lip seal for crank journals showing groove wear.

[68Zproject]

Yes, there is. The #2900 is a standard silicone seal, and the #2912 is the same seal made from a premium fluoroelastomer material. There's also a #BS-118291 offset double-lip seal for crank journals showing groove wear.

On the Summit site they show all those which I understand the difference in.  They also show a 2909 seal which is the fluoroelastomer like the 2912 but it is $16 cheaper.  The side by side comparison shows the 2912 fits v8,v6 and l6.  The 2909 is for small block v8.  Do you know if you can use the 2909?

[68Zproject]

How about anyone else?  Do you know if the 2909 Fluoroelastomer seal is the same as the 2912 or can be used in place of it on a 302?

[68Zproject]

Never mind, the description says "small block" and then application say 400 small block.  Are these expensive seals really worth getting or should I just go with the blue 2900 which was in it when I took it apart?

[bc69]

As johnZ stated, if no grove 2912 is a good choice. I installed this one after trying 2 other felpro seals before. It's the material because seal is made identical. I would have gladly paid $16 more first time around.

[68Zproject]

Unfortunately I had to make my order and already ordered the 2900 as that was what was in it to begin with and hadn't leaked in 5 years.