Offshoreonly.com - The GM/Merc Rectangle port head. Discuss.

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- - The GM/Merc Rectangle port head. Discuss. (https://www.offshoreonly.com/forums/general-q/322168-gm-merc-rectangle-port-head-discuss.html)

ezstriper

01-18-2015 09:56 AM

Have played with these as well, and for most apps 600hp or less, the large oval ports work better, like 781's, with little work and a decent matched intake #'s are impressive...

sutphen 30

01-18-2015 10:03 AM

Quote:

Originally Posted by MILD THUNDER (Post 4251673)

Just screwing around this morning having coffee, playing with my dynosim program. How accurate is it, who knows.

But, I built a typical 502 engine. 9:1 static compression, single plane intake manifold, the ever so common crane 741 camshaft, and a single 950 carb.

Stock GM 188 Heads. = 532HP.

Dart 308 Iron Eagles = 591HP.

AFR 305 CNC chamber =615HP.

Edelbrock Performer RPM Rect =551HP

No other changes made besides the head flow and appropriate valve size. Whether or not the program is accurate, or the data Im entering is, the numbers seem to be in line in what I've seen. Any thoughts?

awesome post,,I'd say it looks really close.

What program is that?I think I know but rather not guess.

sutphen 30

01-18-2015 10:06 AM

Quote:

Originally Posted by ezstriper (Post 4251707)

Have played with these as well, and for most apps 600hp or less, the large oval ports work better, like 781's, with little work and a decent matched intake #'s are impressive...

yup,got ~640hp out of 10.5-1 compr heavily massaged oval ports,ports and combustion chamber.cam was pretty aggressive.

MILD THUNDER

01-18-2015 10:13 AM

Quote:

Originally Posted by sutphen 30 (Post 4251709)

awesome post,,I'd say it looks really close.

What program is that?I think I know but rather not guess.

Its "dyno 5 sim" . Got it from summit or jegs I think for around 100 bucks.

mike tkach

01-18-2015 10:32 AM

joe,you just cost me money,i just ordered one from summit,102 bucks.

sutphen 30

01-18-2015 10:41 AM

Quote:

Originally Posted by mike tkach (Post 4251722)

joe,you just cost me money,i just ordered one from summit,102 bucks.

should have search Amazon,saw it for $53.

abones

01-18-2015 10:45 AM

make sure you get the right version they offer two grades with different options! $50.00 or $102.00. also offer 2 drag racing applications as well. I love mine it works very well!

MILD THUNDER

01-18-2015 11:27 AM

This is the one I have. Sold under comp cams label.

http://www.summitracing.com/oh/parts/cca-181501

http://proracingsim.com/dynosimmainpage.htm

MILD THUNDER

01-18-2015 11:29 AM

I see "desktop dyno 5", for 50 bucks. But, not same one I have.

http://www.summitracing.com/oh/parts...6011/overview/

abones

01-18-2015 11:34 AM

Quote:

Originally Posted by MILD THUNDER (Post 4251748)

I see "desktop dyno 5", for 50 bucks. But, not same one I have.

http://www.summitracing.com/oh/parts...6011/overview/

Thanks Joe, that's what I was trying to get across.

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