the dyno report is in for my 390 and it is not what i wanted it shows peak torque at 2000 rpm at 466 and peak hp at 4500 at 268

 

Refresh our memory, what are the details of the engine? This was and engine dyno or chassis dyno?

-Scouder

 

Well if he has a C6, I could see it knocking the HP down that far..on a chassis dyno!! whats the rule of thumb? dana 60 and a C6 25 to 30%... That 80Hp to add to his what..268..so thats 348 @ the Flywheel...

 

here are the details 390 standard bore ported c8ae-h heads edelbrock streetmaster intake with demon carb 750 cfm i think. cam specs are int lift .600 exh lift .750 lobe center 116.5 valve overlap 22 int duration 254.0 exh duration 256. set 12 btc

 

Is that a roller cam? Are those the .050" duration specs? Also, that 12BTC is for the ignition timing, not cam advance, right?

Sorry for all the questions, I just think we need a little more information.

 

Holy crap! What kind of cam is that? What rockers do you have? If those are .050 numbers on the cam then I think we found the culprit. Are you sure it's .750 on the exhaust? I'm running a 511 with 12:1 and BIG heads and my cam is on the edge of being too much with a .262 duration @ .050, and I only run .695 Gross lift on both valves!

We definately would like more info on this one.

-Scouder

 

yeah the shop that ground it ground it to those specs and the cam is 12btc and i am runnuing roller rockers at least it makes good torque

 

You mean you advanced the cam 12 degrees? Well that's what's doing it. Set the timing straight up on the cam and I think you'll have the problem solved!

 

did we ever determine if these were chassis rear wheel numbers or engine dyno numbers or more Desktop Dyno numbers?

everything looks a little wierd....Cam advanced 12 BTDC!!!!!

 

Don't know if it was chassis, or engine. The engine itself looks to have a decent match of parts, but that cam is something else. It seems to be all over the map. A TON of lift on the exhaust, WIDE lsa, and I don't know if those are .050 numbers on duration, so it's either way to much or way to little duration for those heads and intake.

-Scouder

 

i like the torque though at 466 pounds at it was a engine dyno

 

I think that's a good torque number, especially at 2000rpm. It would probably make even more torque at higher RPMS if the cam wasn't so odd. Not to mention the HP, should step up a good bit.

Do you have a Dyno graph? How about air/fuel graph?