Welcome! Now go to the Pontiac portion of this website and start a thread on your car, there. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]
Here's a couple of my projects:
https://www.yenko.net/ubbthreads/ubbthrea...-tre#Post539528
https://www.yenko.net/ubbthreads/ubbt...eux#Post487291
and the monster thread of them all:
https://www.yenko.net/ubbthreads/ubbt...ta-new-project
I would not get high compression pistons. The low compression Pontiac round port engines do not respond like a other engines (Chevies in particular) where raising the compression makes more power. 455HOs and SD455s don't like them and don't respond well to them at all. You'll just make it slower and addicted to racing gas. If you peruse the second thread above, you will see that the 455HO I had, had those domed 10-1/2 to 1 forged pistons installed and preignited like a monster - to the point where it left visible wear on the rod bearings and the timing could not be retarded back far enough to stop the knocking. And it was actually faster after I rebuilt the engine and installed forged 8.4 to 1 pistons.
A proper blueprinting of the engine will get you where you want to be. Everyone who has thrown a set of headers on a round port car ends up complaining about the leaking gaskets/flanges and winds up going back to the manifolds which were some of <span style="text-decoration: underline">the</span> best flowing cast iron manifolds ever produced. The best bang for the buck is getting a true dual exhaust setup with an x-pipe and without the crossover muffler. Also, getting the carb tuned properly will amaze you. The jets and metering rods need to be richened up by at least 10% to offset the 10% ethanol in today's fuels. There is a good 20 horsepower in that carb just waiting to be unleashed with the proper settings.