DevilsAddvocate

What edelbrock heads are these? The performer RPMs?

WhiteLightnin83

yes the performer rpm aluminum heads.

DevilsAddvocate

If i had to guess id say low 400 horses.

DevilsAddvocate

You can always throw it into desktop dyno, im too lazy right now tho. Ill do it 4 ya l8r and tell u what it comes up with.

WhiteLightnin83

ok, that would be awesome if you could do it, i'm in school at the moment and i'll be on here till about 3:10 so if you could do it b4 that then that'd be great otherwise i'll just run to my grandparents house later tonight to see whatcha came up with. thats cool that you think it'll be in the 400's though.

DevilsAddvocate

What size headers? Threw Mufflers Or Open?

DevilsAddvocate

Small Tube Headers with Mufflers it says it puts out

433 horses @ 6000rpm
452 torque @ 5000rpm

Large Tube Headers with Mufflers


487 horses @ 6000rpm

452 torque @ 5000rpm

Small Tube Headers Open Exhaust

482 horses @ 5500rpm

472 torque @ 5000rpm

Large Tube Headers Open Exhaust

470 horses @ 6000rpm

473 torque @ 5000rpm

Thats with a cam spec of .488/.510 lift
duration of 232/242 (closest i could find) and a lsa of 112

I hope those #s are right, they just look kinda high to me so i dont wanna get ur hopes up. Then again hey ya never know might be right. My guess would be low 400s tho hp wise, torque might be up where it says but hp imma have to say lower 400s. One way to find out, build it and put her on a dyno. Good luck.

DevilsAddvocate

Woops i did it wrong , messed up on the test diameter of the valves hehe. Sorry 4 gettin ur hopes up but i told ya. Here is what i got after the corrections. This seems a lot more accurate to what i was thinking.

Small Tube Headers/Mufflers
399hp @ 5500rpm
428ft-lbs @ 4000rpm and 4500rpm

Small Tube Headers/Open
422hp @ 5500rpm
446ft-lbs @ 4000 and 4500rpm

Large Tube Headers/Mufflers
408hp @ 5500rpm
432ft-lbs @4500rpm

Large Tube Headers/Open
429hp @ 5500rpm
444ft-lbs @ 4500rpm

That looks accurate to me. I honestly do not know how accurate desktop dyno is compared to real life. Ive heard mixed oppinions maybe somebody can actually tell me if theyve dynoed it and desktop dynoed it and came close to the same #s that would be awsome. Hope that helps pal looks right to me tho.

WhiteLightnin83

awesome, thanks alot again devils. well i guess that'll have to do for now on hp know any little easy mods i could do to get a little more hp/tq here and there? and am i gonna need traction bars for my 83 z28 running those numbers?

WhiteLightnin83

just a few other questions since you seem to know ur stuff pretty well... well when i get these heads i'm lookin at having like $1000 dollars to spend on them, maybe a little bit more so i was wondering if you thought any other set of heads would be better for my application,they'd have to be 64cc aluminum heads and already be assembled to just bolt right onto the motor when i got them but i was curious to know if you thought any other set of heads would be better for about the same price as the edelbrocks... and my other question is what size drive shaft do i need for my car do you know? with the turbo 400 tranny. i just found out last night that my drive shaft won't work with the 400 tranny since i had a turbo 350 in it before this. i'm not sure but i think the 350 was a short shaft so i'm wondering if thats the same length as the 400 or not. i know i have to cut the end off the 350 drive shaft and weld to a 400 end so it'll fit in the tranny and fit in my U-joints but i'm curious to know if it needs to be lengthed or shortened at all while i'm doing it... if you aren't sure its fine but i figured i'd ask anyways since you seem to have a pretty good idea of whats goin on with all the questions i'm askin ya. thanks again for everything so far.

DevilsAddvocate

How much the heads going to cost you to begin with?

WhiteLightnin83

they're priced at $1,019.00. i was also looking at some dart pro aluminum heads. could you explain some differences to me about the heads, i know nothing about them. like the differences between intake runner sizes and valve and spring sizes. i'm wondering what are effects of the different sizes of these becuase i don't really know anything about them and i'm looking for a good set of aluminum heads to match up with my motor and i don't really know what to shop for. i don't want to spend more than like $1200 on a set though if at all possible.

DevilsAddvocate

You want to find a head that flows the cfm requirments that your motor will need with the smallest intake port size. Lets say you find a head that flows 250cfm with 220cc intake ports, then ya find another that flows 248cfm with 200cc intake ports. You would want the head with the 200cc intake port, since they flow damn near the same yet the intake runner is 20ccs smaller. This means the air/fuel mixture will be traveling through it at a much higher velocity in turn usually a real noticable increase in torque. Lets say you blow through a straw. You can barely get any air through but if you put ur hand at the other end you notice the air is traveling through it at a very high rate of speed. Now blow through a toilet paper roll. You can get a lot of air through but put ur hand over the other end and its moving at a much slower pace than the straw. Now lets say you have a straw that will flow just as much air as the toilet paper roll but still come out the same speed as the small straw. Thats the best way i can describe it lol. So find out how much you need ur heads to flow. Then find the head that will suit those flow #s with the smallest size ports. Also when looking at head flow charts. Do not look at how much it flows at .700" of lift if your cam is only making .500" since it will never see those flow #s. Also choose one with the best mid lift flow #s, max flow is important, but mid lift is more (like .300"-.400") since the valve will see that lift twice, once opening and once closing, instead of max flow which will only see the lift once in general. Do you have your intake manifold yet? If not, if i were you i would look into those NEW vortec heads that came out. They have one with a 206cc chamber i believe, donno what it flows but its probably a **** load. Donno how much it costs neither but you can find out im sure. They have two new ones tho, one is still at the 170cc size (could use it but i wouldnt), the other is at the 206cc size (would get it it if i were you). Hope that helps some.

WhiteLightnin83

ok awesome, that helps alot then. thanks for the help again... you know someday i just might be a motor head and i'll be able to leave you alone!