another 383 build up Q

Well, I would start with makeing sure that the block and internals are good, then if they are bore it .030 and use 11.5:1 pistons, get them as light as possiable with light weight pins. Make all of the rotating parts as light as possiable as the 383 is going to have the hardest time makeing 600 HP due to bore and stroke size. A larger bore will make power much more easily. Then use a cam with a 256-264 duration with a 103-113 centerlines. I would use the new Max Wedge heads from Mopar as they are a compact or closed chamber type.
Use a set of hedders that have a 2" primary 44" long. Use the stock size valves that the heads come with as the ports are very efficent and don't need any larger valves. Then I would top it off with a Indy Intake manifold as they have one that will bolt up. Part # 400-2. Then I would use a 2" spacer for a 4150 to 4500 carb and run a 1050 #9375 carb.. Use 1.6 roller rockers and titanium retainers. Now if the machine work is done correctly this combination should get you in the 610-620 range NA and utilizing factory parts. ( rods, crank, block, and heads)
If forced induction then 4340 crank and rods will be the order, along with a aftermarket block. Then 700-800 HP can be achieved.


BJR Racing