The H-O seal is a Caddy seal and is marginally effective. BOP is making a new seal specifically for the Pontiac. Unfortunately we started with the 3" main which we will be shipping next week. The 3 1/4 will be awhile yet. Here are a couple of links to the seal and a testimonial of one of our prototype testers.
http://www.bopengineering.com/pontiac_acc4.htm http://www.krepower.com/newpro1.htm
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Wade Congdon - BOP Engineering
www.bopengineering.com
"If you can turn left you're going too slow"
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Wade Congdon
BOP Engineering
Hi-Performance Specialty Parts for Buick, Olds, and Pontiac
www.bopengineering.com