When selecting a SR cam for a Pontiac block, first thing, Install Megga Brace. Not the KRE one.
When you look at a potential cam subtract the advertised duration from the @ .050 duration. You do not want anything less than 32 for a stock block.
Better yet, 34-36.
A cam lobe I KNOW will run forever in a stock 455 is one based off the old UD .4179 lobe.
I spoke with Tim G at Bullet and this was the biggest cam I was comfortable running. I know some guys get away with a more aggressive cam in a stock block. Not worth the risk IMO.
If you called Tim at Bullet and had him work up a cam using that .4179 lobe based off the rest of your combo I know it will get you below 10.50s with your High Ports Its known for being gentle. Guys run it in sbcs and with their lightweight valve train they can do it with really low spring pressure.
High spring pressure and a aggressive lobe it what kills stock Pontiac blocks.
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