rear main seal

[Anonymous]

how do i know which rear main seal i am to use? it has been well over three years since i have had my motor apart and i cant remember if it had a rope style or a plastic rear main seal. well i am now at the point of assembling the short block and dont know which to use. will either work? is one better than the other? the motor is a 1966 200.
i have had it bored .040, 10-10 the crank, balanced and i have flat top pistons and arp rod bolts installed. not sure which cam i am going to run yet but would like to hit 5000 rpm without too much concern. dual rooler timing set from you know who 8) and a 75 head. plan to buy header for it, also from same guy. will also run a t-5. this setup will be in a 66 falcon.
i hope to be done with this PROJECT in the next few years. yes i said years
i hope to post some pics one of these days.
thanks, rob

 

[I66coupe]

I have just installed a neoprene seal from FelPro in my '66 200. I have not yet run the engine and won't be for while. I know that doesn't help but I wanted to let you know that there is a small steel pin in the bearing cap that has to ground down if you change to the neoprene seal. Its there to hold the rope seal in place and is not needed for the new one.

I used a small Dremel tool to grind it away.

So far, thats all I know.

 

[MustangSix]

You can tap that pin out with a punch.

I always use the neoprene seals. Less drag and I have always had good luck containg the oil with those. Can't say the same about the rope seals.

Offset the ends from the main cap parting line and use just a very thin smear of silicone on the end of the seal.

 

[I66coupe]

Jack, I didn't offset the ends. I installed it flush to the block. Am I doomed?

 

[MustangSix]

DOOM!

No, you should be ok. I just do that so that the parting lines are not lined up. Seems to reduce the chance of seepage.

 

[addo]

I can't remember whether it's 1/32 or 3/32 inch offset, but the later MoFoCo manuals here said to do the offset thing. A dab of Permatex (kept well on the outside) is popular, too.

 

[Anonymous]

thanks guys

 

[Anonymous]

I don't think you can put them in offset. Just make them as flush as possible. Alittle sticking up will help with sealing. Make sure you apply sealant only to the tip of the real ends that will be touching when you replace the bearing cap that retaines the seal

 

[I66coupe]

My instructions with the seal said to not use anything on the seal ends.

DOOM!

Oh, well. If it leaks, I'll yank it back out.