Quote:
Originally Posted by TRADERMIKE 2012
Can someone give me their best guess about my Engines HP: I have a very strong 4 Bolt Main Armersteel Crank and it is very clean inside the Engine. I have a mild build on a 1967 Pontiac 428 ci HO "YK" code Tri-Power Intake that is up jetted, new "041" Cam, new Hydraulic Johnson Lifters, new Chrome Moly Pushrods, new 7/16 Rocker Studs, new Oil Pump, new 6 AL MSD Ignition with a rebuilt Electronic Distributor, Functional Air Induction and a new Timing Gear that has been Advanced to 109 C/L .
Coated Headers inside and out plus their wrapped. Exhaust travels through 3" Collectors to about 2" pipes and 2.5" Exhaust exiting through the Rear Diffuser (No Mufflers). Engine sits in a 1979 Pontiac TA that weighs about 4000 lbs. Has 3.23 Gears in the Rear End Posi- traction 4 Wheel Disc. Brakes. TH 400 Trans. is in front of the Gear Vendors Unit. Commanded by the B+M Shifter with the button on the Grip for the GV. Starting with the 376 HP from the Factory, I would be satisfied to be getting one HP per Cube?
I have never had it Dynode, but I have had it up to 130 MPH on the old Cam when it was worn. I know this current Cam "041" is designed for even more top end. So, at this time, I don't have the speed rated Tires to even try to surpass 130 MPH.
Also, I just remembered I have installed a Hughes HD Torque Converter and have yet to try It, as I am finishing up this project that I have found myself grossly intertwined in doing. The answer should be in terms of 1967 ratings please.
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What kind of work has been done to your heads? If stock d-port I'd expect similar performance but if ported to roundport flows then you could safely say you would have similar performance to such.
There was a figure posted that one cfm of intake head flow was good for two horsepower (actually it is closer to a 1.9:1 ratio) so if you have everything right a stock 208 cfm intake port can support 416HP. Since power comes from heads if you flow at 250cfm you can potentially make 500hp.