[ddekeyser]

Have narrowed my head selection down to 3, the only difference between them being the intake runner volume.
The part numbers are 12301, 12303, and 12305 by RHS. 180cc, 200cc, and 220cc intake runner volume.
How do I pick what volume I need for my 383? Would like recommendations, but would also like to understand why.

[bondo]

Ayuh,... Basically, the smaller runners are for building torque, down Low...
Bigger runners are for building horsepower Higher in the rpm band...

As usual,...
Much more Info on what, Exactly you're trying to do, in what application is necessary...

[ddekeyser]

Just trying to build a solid, reliable street motor that can go down the track occasionally. They are all the same price too, so thats not an issue. The cam I have is only .440 lift on int and exh, and 266 duration int and exh. Might eventually swap out the cam and maybe throw nitrous on, but that is way down the line.
On the RHS site, they actually say that the 220cc heads are the way to go on 383, but never really say why. They just have a chart for cubic inches.

[zildjian4life218]

whats the power band on your combination? A lot of people are running 170cc vortec heads on 383s so i wouldn't see why the 180cc head would be perfect for ya. Maybe if you were turning some serious rpms then the other heads would be a consideration, but to me the 180cc heads would be perfect. Like bondo said smaller runners build torque, 383s build torque easier due to the longer stroke.

[F-BIRD'88]

Your best choice for your purpose is the 200cc port volume.
If your 383 has a flat top piston choose the 72cc chamber head.
Ditch the cam. Its too small for high perf. Give it or sell it to some one who whats a one step up "RV cam" from a stock cam in a stock motor.

[nick8]

With that cam I hardly think it makes a difference. As stated above, you need a bigger cam.

[ddekeyser]

thanks guys