Greetings,

I am coming to the final stages of my 383 rebuild and was just wondering if anyone could give me an idea of a realistic power output range since I may not have access to a dyno. Here are the stats:
67' 383 block bored .60 over and milled
Factory forged 383 crank and rods
KB flat-top pistons with valve reliefs
67' factory 516 closed chamber heads short-ported and polished with stainless steel over-sized valves. Milled and gasket-fitted for a comp ratio of 9.9-1
Roller rockers.
double roller timing set
Comp flat tappet 280 Magnum cam
Edelbrock Performer RPM intake with 650 Thunder carb
Hedman headers
I think that's everything. Any thoughts or ideas would be appreciated.

 

DD -

Impossible to say with any certainty. Things like header primary diameter, type of exhaust configuration post header and what you have hanging off the engine all factor in. (also didn't mention cam lift)

The 650 carb may not he your best choice, but people do go that low with good results (there's more to a carb than just cfm).

Gut reaction, if everything is tweaked, 400 - 425 HP at the flywheel, maybe 100 less at the rear wheels, but don't take those numbers too seriously.

Archer

 

here's an important question: what rpm range is your cam? 2000-5500?

 

The cam is 280 duration, 480 lift at 2500+ RPM.

 

650 will be just fine imo...

 

i would guess around 400-425 at the flywheel