I used one of the VITON seals on my rebuild and no leaks.
Viton ® Main Seals-With the mandated removal of asbestos from the factory type rope seals, increased leakage has become commonplace. To address this problem BOP Engineering has designed a rear main seal for the traditional Pontiac V-8’s. These seals are not a retrofit from some other engine, but designed from a clean slate using state of the art technology and the best materials. Testing has shown a significant reduction in drag over the factory rope seal, and no leaks! Available in both 3 main size 301 - 400 engines and small journal aftermarket blocks, and for 3 1/4" main size 421 - 455 engines and large journal aftermarket blocks
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