Pontiac Rear Main seal

We are happy to introduce our new and improved 3" Viton ® Pontiac Rear Main Seals as well as our 3.25" Viton ® Pontiac Rear Mains seals.   Why the redesign you ask?  Most of the changes made to the seal were cosmetic - plain and simple!  Excess flash has been removed from the seals and other areas of the molding process "tightened up".    See below....

TIP-RM300 installed ni a stock Pontiac rear main cap

TIP-RM300 logo on seal - clearly defined sealing lip

TIP-RM300 outer diameter of seal

Helix continues to the edge of
sealing lip to match with other seal for a perfect seal.   Seal ends are properly trimmed and have the correct cap shape / form.

Molded sealing lip flash line is
above and away from sealing lip.  No uneven flash on lip and clearly labeled Tin Indian Performance RM300

OD of seal is very clean
with no offset between halves.  NO  flash present

 Unlike other seals are seals made in the USA (not  some foreign country) AND we have such confidence in our product, we will never try to sell you a revamped rear main rope seal.  You won't EVER see us selling a rope seal, period!  Our seals are clearly labeled with TIN INDIAN PERFORMANCE  and both the RM300 and  the RM325 seals.  We are so confident in our seals that we put our company name right on them; not some other company name or no labeling at all. Our seals are color coded as well.  The purple seal is our 3" Viton ® Pontiac rear main seal and our black seal is our 3.25" Viton ® Pontiac rear main seal.  Our seals are made and designed by Pontiac Engine Builders and are the clear choice when you want the absolute best in oil control when rebuilding your Pontiac engine.  We are consistently lookinf to improve and deliver the best quality possible in our gaskets and seals.

Pontiac 3" Viton Rear Main Seal

Pontiac 3" Viton ® Rear Main Seal

These Tin Indian Performance Gasket & Seal Pontiac rear main seals are specifically designed for the Pontiac block.  Seals fit both stock and aftermarket MR-1 Pontiac blocks.  Seals are made of Viton and are far superior to the factory rope seal.  They are the single most reliable way to control oil in a Pontiac engine.  

TIP-RM300
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Pontiac 3.25" Viton Rear Main Seal

Pontiac 3.25" Viton ® Rear Main Seal

These Tin Indian Performance Gasket & Seal Pontiac rear main seals are specifically designed for the Pontiac block.  Seals fit both stock and aftermarket MR-1 Pontiac blocks.  Seals are made of Viton and are far superior to the factory rope seal.  They are the single most reliable way to control oil in a Pontiac engine.  

TIP-RM325
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Home of the fastest Viton ® Pontiac Rear Main seals on the planet!

Jeff Kauffman 6.62 @ 209 with a Tin Indian Performance Viton Rear Main Seal!

Kauffman Racing Equipment uses Tin Indian Performance Viton ® rear main seals in their 2000+ Horsepower Blown Injected Alky engines as well as their pump gas street engine builds!

Which Pontiac rear main seal do I need?

At Tin Indian Performance, we sell / advertise our seals according to the main journal size of the appropriate engine that uses them. 

 

Pontiac engines / blocks that have 3 inch mains are 326 / 350 / 389 /  400.  Keep in mind that when I say this, it means the cid of the original block casting.  Pontiac engines / blocks that have 3.25 inch mains are the 428 and 455 blocks.  The most common main journal size for aftermarket blocks is 3"; however,  3.25" mains are also available as well.  Now for those who are into measuring things and have the crankshaft available to them, the 3 inch main blocks have a crank sealing surface of approximately 3.188 inches.  This would require the TIP-RM300 seal    The 3.25 inch main bearing cranks have a sealing surface of 3.436 which would use the TIP-RM325.

 

So when ordering your seal, know what main bearing journal size you have.  If it is a 3" main you will need a TIP-RM300.  If it's a 3.25" rear main journal, then it is a TIP-RM325.