EQ 23 SB Chevy Heads- Home porting costs for CNC results.

[Dusty]

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[1989GTA]

Interesting article. Are you at liberty to give out the cam specs for the tests. I would be interested in the first test at Speed O Motive with the DV cam and the last test that you ran. Thanks.

[132K]

i like what i have seen thus far from the EQ heads, but im really not sure as to where they came up with the pinch point right near the intake port entrance, i have yet to see this on any other small block head. would you or possibly DV know exactly why or how they came up with this seemingly uique feature? am i missing something? please, do tell.

also, do you or DV have any experience with the dart platinum iron eagle heads with 49cc chambers? they seem to be the only comparison to the EQ 50cc heads that i have found. any insight? thanks.

[GMH326ci]

what if any are the advantages of using an alloy head if say both iron and alloy head were exactly the same? can alloy head make more power?

[Dusty]

Originally Posted by GMH326ci

what if any are the advantages of using an alloy head if say both iron and alloy head were exactly the same? can alloy head make more power?

I am curious about that too haven't ever tested it. However you should be able to get away with more compression on an aluminum head. These eq heads have such a tight little chamber so an aluminum copy would probably have minimal gains. Any rebuttals??

[Dusty]

Originally Posted by 132K

i like what i have seen thus far from the EQ heads, but im really not sure as to where they came up with the pinch point right near the intake port entrance, i have yet to see this on any other small block head. would you or possibly DV know exactly why or how they came up with this seemingly uique feature? am i missing something? please, do tell.

also, do you or DV have any experience with the dart platinum iron eagle heads with 49cc chambers? they seem to be the only comparison to the EQ 50cc heads that i have found. any insight? thanks.

That "pinch point" is for pushrod clearance and has been exaggerated by the way the head has been sectioned (think optical illusion). It is similar to other heads and when we fully work over a set of heads its something we blend out.

[automotivebreath]

Originally Posted by Dusty

I am curious about that too haven't ever tested it. However you should be able
to get away with more compression on an aluminum head. These eq heads
have such a tight little chamber so an aluminum copy would probably have
minimal gains. Any rebuttals??

I run both the Iron and aluminum versions. I really haven't seen any advantage
allowing more compression with aluminum.


Great article Dusty, great heads also. Did you alter the short turn any to
achieve these flow numbers? Also did you reshape the chamber wall across
from the intake port short turn?

[132K]

With regards to the iron vs. aluminum heads and power output. I've been coating combustion chambers, pistons, valves, etc, and i see little difference when the metal is insulated from the combustion process. The aluminum will undoubtedly carry away more heat, but in drag racing applications the weight advantage seems to be the only real advantage over iron.

[bowtie421regal85]

this is a very interesting article. i was wondering whether you or dave could help me with a question? i have a stroker small block 400. it has a 3.875 stroke 4340 eagle forged crank shaft, 6"eagle h beam rod, and JE forged 13.3/1 40 over pistons. i beleive it comes out to 422.7 ci. the block has splayed billet caps

but my question is would the 50cc combustion chambered 235cc version work? or would that raise the compression to much? or would i have to change the pistons? if so since my rotating assembly is already balanced would i be better off getting bigger combustion chambers? with the bigger combustion chambers would the heads flow as good? i have a set of the old dart pro 1 230's but want to get a better head if this is the eq head is not the best option to accomplish this any suggestions we be greatly appreciated. i have just came gfn i have already seen some information packed writings you and dave rock!! any help the two of you could give me would be great keep up the good work.




sorry to write so many questions but also i have a stock suspension buick regal this motor is going in and th400 tranny,coan converter 5000 stahl,it has a 8.5 grand national rear end with a posi unit 4.56 gear and 28 by 13.50 quick time pro tire, hoping to get the car down to 3100# could you recommend a cam for the eq heads? if you don't recommend these heads for me. how about if i have the pro 1's ported? what cam would you recommend? i know this is a lot of ?, but if you could help m,e out i would appreciate it every cam place recommends something way diffrent from the next it's frustrating, and picking a head is tough the eq's sound innovative if i was togo with them would they bennefit from a 2.10 intake valve. so if you can point me in the right direction for the best 23* head and cam.

it would be a big help thanks

[Dusty]

Originally Posted by automotivebreath

Great article Dusty, great heads also. Did you alter the short turn any to
achieve these flow numbers? Also did you reshape the chamber wall across
from the intake port short turn?

A little little reshaping of the chamber wall mostly making it steeper, matching it to the gasket. In the port I only trimmed down the guide bosses and put a coarse finish on the port floor (carb motor).