408 6pack setup

[MR4V]

RGL408, my Duster has a similar combo. Cam is Mopar Purple 528 with OOB Eddies, Edelbrock STR 12 cross ram with 450dp hooleys, compression is unknown as I didn't build the engine, torque converter is 10" 3500, running 3.91 8 3/4 with 28" tyres.

Made 320rwhp at 5400 on the same Dyno, revlimet is set at 6000.
I know your tuner well and he knows his stuff, my limiting factory is the OOB heads, the cam and the cross ram. Did Marty show you my Duster run?

 

[moper]

If it was me I'd get the Promax jet plates for the secondaries.

 

[jimbo17]

RGL! I have a 410 small block in my Valiant Charger! It made 355 RWHP on the dyno. It has only a baby 228/232 hydraulic roller cam in it but it easily spins to 6000rpm. It has done 11.7 @117mph and that was before I put bigger valves in the edelbrock head (2.05) That 355 hp was made with only 28 deg timming in it as I had not checked it before the dyno and we ran out of time. Just found out after I took it home then changed it to 34 deg and it felt like it really woke the motor up. I think 6 deg will make a significant gain in dyno numbers.By the way oit runs a tremec T600 5 speed box.

 

[rumblefish360]

I wouldn't sixpack anything that I wanted peak performance from. Bottom line is buy a good 4 barrel intake matched to heads with a quality 750DP and tuning will be a breeze. I find sixpacks to be a factory gimmick. Power was so low back then they could have a shitty tune but no one cared be cause they had a "SIX PACK". I don't know of a single car owner looking for max performance running a sixpack setup. My $.02

I agree! Then again, the 6 pack being a dual plane isn't going to give a great peak performance vs. a single plane any better than another "dual plane" would. The performance sought with a dual plane is t a max effort set up ever and never will be. Not saying you can not have a great performing engine with a dual plane. Just a whole lot better street, street strip performer with a better torque curve for driving the street.