1970 Trans Am Project

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Now on to the distributor...

The MSD Pro Billet distributor comes with several different colored bushings. The default bushing installed is blue and stops total advance at 21 degrees. It also has a black bushing that can be installed that limits the advance to 18 degrees, a silver bushing for 25 or a red bushing for 28. Uggggg, which one should I use????



There are also different Springs I can install that control how quick the total timing comes in. At what RPM should the total timing come in? The default Springs bring in total timing at 5500 rpm but that seems way too high for a Pontiac. The kit includes Springs to change it from anywhere between 2000 to 5000.

I would go with the default bushing. That way you can run 15 degree init timing and have 36 degrees total. Engine could prob take more, but if you're running it long and hard (road race) better to be safe than sorry.

As for the brake lines, going from 1/4" to 3/16 should not make any dif in pedal feel. The master pushes the same volume of fluid regardless of brake line ID. The smaller ID would be more resistant to sponginess however if you're fluid wasn't 100% fresh. I guess you can make the opposite argument for resistance to boiling, but the brake fluid doesn't circulate very well. I run the motul 600 in my viper. There are more expensive fluids, but for the money it works really well. Change it every time to change your motor oil if you're tracking hard. I don't see a down side to the 3/16" lines.

Nice build! I like your brake setup. Maybe one day I'll try those hats/rotors, but I'll use Brembo brakes off the gen 1/2 viper instead. The 13" rotor fits inside factory 17" wheels so it should work.