The GM/Merc Rectangle port head. Discuss.
01-17-2015, 06:00 PM
#11
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For whatever it is worth we used the stock heads for a reason. We targeted 580-610 hp for the race motors. Which we have 600. Everything we use is off the shelf and easy to get . Its easy to keep a couple sets of spare heads around ready to go. I do realize that we are at the max those heads will put out w/o a blower and that's fine. They idle perfect and run great, I would not change a thing unless I thought I needed more hp.
01-17-2015, 07:59 PM
#12
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[QUOTE=sutphen 30;4251341]yeah,stan wiess has some good info.heres a print out
http://users.erols.com/srweiss/table...hevy_Big_Block
[ATTACH=CONFIG]535800[/ATTACH]
http://users.erols.com/srweiss/table...hevy_Big_Block
[ATTACH=CONFIG]535800[/ATTACH]
01-17-2015, 10:51 PM
#13
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iTrader: (4)
[QUOTE=Rookie;4251520]
Thanks a great website. I've been pouring over the data on there for the past few weeks trying to figure stuff out on my new builds.
yeah,stan wiess has some good info.heres a print out
http://users.erols.com/srweiss/table...hevy_Big_Block
[ATTACH=CONFIG]535800[/ATTACH]
http://users.erols.com/srweiss/table...hevy_Big_Block
[ATTACH=CONFIG]535800[/ATTACH]
01-18-2015, 08:52 AM
#14
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?
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?
Last edited by MILD THUNDER; 01-18-2015 at 09:36 AM.
01-18-2015, 09:24 AM
#17
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if that program is correct,and i would say it is in line, the iron eagle head is the best bang for the buck.i still like the afr cnc,d chaimber 305 and i think in reality it would do a little better espically in a marine application because we can run them a lot cooler than in a car.
