[bhieb]

Originally Posted by tempest1964

Here is a thread on a 428 with a tri-power. A 428 is basically a 421 that is .030 over. Anyway, might be worth a look: https://forums.maxperformanceinc.com...&highlight=428

Hi tempest1964,

Thanks for this link. Very interesting build and surprisingly good dyno performance results!

Apparently the key to this build was the SD "Stump puller" cam. I've been told there have been a lot of advances in camshaft tech over the last few years, so I wonder if there are any newer cam grinds for Pontiacs out there?

Brad