so i gather that i need more flow to make more power than these heads give for my car to run more powerful on the street. Is that much more torque and hp with more head flow? I am pretty new to this game, all info is greatly appreciated. I probaly should state that i have 3.73 rear gears turbo 350 non lockup shift kit by tsi, 488/510 lift cam, 232--242 duration, 1 5/8 headers flowmaster 40 dual exhaust, 770 street avenger card, 4" aircleaner

 

gkull is one of the real experts here, and moterhead knows his stuff as well..... gkull gave his approval to "valley Heads" and i believe this carries weight. so, that being said, VH did tell me the Edelbrock heads were not as great as the advertisements state. and that the Sportsman II heads I have, they can make flow as good or better than just about anything out there...

all your engine is a air pump, and the easer you make the flow of gases in and out the engine the more volume you can run, and the more power you will produce as you go higher in the RPM range... it does not affect TQ as it does HP.... TQ gets you going, HP keeps you going... when I was having problems with my valve train and my lifters were not opening all the way on just 3 valves, my hp dropped ~60hp.... but the low end tq remained somewhat stable.

Now, with the flow being as good as it is, my motor doesn't stop pulling all the way to 6500 rpm... and the faster the engine spins it seems, the more power it seems to produce, where as before it would level off at about 4K... still pull to 6500, but not with an increasingly greater power all the way to 6500.. thats where the heads come in, thats where the hp is built, up top


btw, is your cam flat tappet or retro roller... the rpm roller is more aggressive and has a larger lift than the ft rpm...

 

Do you know your cam specs? 406 ci can use in excess of 210cc and still run fine.

 

my cam is flat tappet. came with the edelbrock rpm performer package, air gap intake seems to be a mild porting or machining on the heads in the cc area. the kit # is 2908 i think.

 

it is an edelbrock performer rpm cam 488/510 with 234-244 duration 107 centerline and 112 lsa.

 

This car pulls good to 6000 rpm the nose never comes down, does not seem to pull as hard after 4500 or 5000 rpm or so but still pulls, but remeber i am a sreeet engie not strip. The torque i have is substancial, lots of it. have to go to a m/t et street radial to keep the car kinda straight off the line, have to feather the acceleration alot up to about 3000 or so rpm before i even think about wot.