Pontiac Block are the exact same physical size from 350-455.
So there is no such thing as a small block/Big Block Pontiac.
There are now a few aftermarket blocks out now....
Indian Adventures....which is an Iron Block....can be taken out over 600ci.
All Pontiac/Butler Performance has just released an Alumnium Block.....which is US$4700...and is on my shopping list.
A traditional Pontiac block/crank really can't handle over 900HP....which is why I'm looking at the Aluminum block....and Billet crank.
Mine is a 455 stroked out to 474ci.....It should have about 600-650HP at the flywheel....just waiting to get it on the dyno when I sort out the little problems.
Pontiac performance parts are harder to come by...and are always alot more expensive than Chev/Ford.....
And in Australia...there is not too many High performance Pontiac powered cars out here...most go the Chev route as it is easier and cheaper to get performance stuff.
I like to be a little different.
You can check out
Butler PerformanceWhich is where I buy all my stuff from.
My corvette....is only a mouse.....very very mild at 160HP at the wheels.
Gas