edelbrock e street heads

wondering if anyone could tell me how much increase in torque and hp with the aluminum heads over stock 906 heads. my motor is a 440 with hughes cam, aluminum intake, 850 demon, and headers. i have plenty of compression based on my cylinder pressures 195-200 in all holes. i had to really tinker with timing to keep pre det at bay. just wanting opinions on performance improvments with swap. also changing ch4b for a rpm intake. thanks

if you have that much cylinder pressure with 906's the e-streets may make matters worse on detonation. you may pick up close to 1.5 points in compression.

the 906's were shaved 60 thousanths

Is the Hughes can installed allready?
What are the specs of the current cam and the Hughes cam?

rumblefish360 said:

Is the Hughes can installed allready?
What are the specs of the current cam and the Hughes cam?

Click to expand...

yes its in the motor now, 515 intake 536 exhaust... 230, 238 @50

Depends on what combustion chambers they have 75cc & 84cc IIRC
depends on compression height of you pistons & head gasket thicknesses...
the ports in the BBM E-Streets are "basically the same configuration" as the RPM's too...
291cfm int./217cfm @ 0.600" gross lift, good to max 0.600" gross lift OTB
{278/206 @ 0.500" gross lift} 2.14" & 1.81" SST valves, better flow, lighter etc.

many more factors to accurately predict Hp/Tq #'s

a 906 head would have to be really well ported, to come near that range,
it's in the realm of possibility thou...

the aluminum heads are about 60#'s lighter, if nothing else
the alum. will help dissipate some heat faster too...

Ball park "Maybe if everything is set up correctly",
possibly 50-70 hp over a stock port/valve size iron 906,
depends on what's been done to the 906's, the cam, quench, compression,
the header size & length, the total combo etc.

some people hate alum. heads & will always down talk them too, just do your research...

I'd suggest talking to a professional about what your plans are...

We have a great guy here IQ52, he may chime in....
Give his opinions...

0.060" off the 906's, probably be about near or close to the same compression...
depend on what the cc size is now...

maybe go to Comp Cams & download the CamQuest program
it may have a cam close to yours & you can put all the info/details
heads flow etc. in the program of you build & get a decent idea of
Hp/Tq #'s possibly, the What IF's...

thanks for the great info. the 906's are stock except for the milling. 50 to 70 hp increase would be considerable to me. i have read where it would be smart to let good machinist to check them out of box. the guy i would use said i needed to find out stem height and spring pressures for cam. to your point about compression, i was told with 75 cc version they would be very close same considering i go with same gasket thickness. we would cc 906's when we pull them

found some OOTB e-head intake flow numbers: .1- 62
.2-122
.3-183
.4-230
.5-262

Check out Edelbrock's web site it has tentative flow #'s

click on the appr. head they are listed own below

http://www.edelbrock.com/automotive/mc/cylinder-heads/chrysler/