Join Date: Jan 2004
Location: Winston Salem, NC
Re: SBC 400 build
2-bolt 400s are stronger than 4-bolt so go that route for sure. If you get a good 400 block they can take a pounding. I would not build a 434 with a factory block though.
My thoughts are, if you have a 383 already spend some money on it. Get some head work done (or a new set), cam, intake, whatever. It will be a bunch cheaper than building a 400 from scratch.
A good converter can pick you up as much as a good set of heads some times....
69 Camaro, 3450lbs., 400, Cal Tracs, Coan 10", TH400, 3.50 gear, no trailer
D1SC blow thru, pump gas, 9:1, ~10 PSI,
1.325 60', 5.988 @ 115.4