bluegrassz

iTrader: (3)

Does anyone know anything about the new Dart heads that Summit is going to be carring. It says thay have 10% more flow over the other dart Iron eagles and have a 5-angle valve job.

Check them out here:Dart Iron Eagle Platinum Cylinder Heads SBC

Orr89RocZ

iTrader: (20)

They seem nice so far. flow alot more than regular Iron eagles and pretty cheap too. 500 each aint bad but for alittle more you could get some aluminum heads.

I guess they would work great on pretty stout small blocks but would need corvette egr to make them legal.

http://users.erols.com/srweiss/tablehdc.htm

Great link for flow data and most every cylinder head. Shows comparison of iron eagle 230 to the 230 platinum and its impressive

bluegrassz

iTrader: (3)

Yeah, that is another problem im having. Should I go aluminum or stay iron? Im only wanting about 425-450 hp at the flywheel. Might stepup to a 383 later. I would even cosider vortecs if they would get me to the hp mark. lol.

Oh yeah, nice link. Just trying to figure out how they get there hp #'s. Is the hp # what the head would support? Or were these heads put on a specific motor and dynoed?

1989GTATransAm

iTrader: (3)

Yes on the HP. What they do is take the intake flow and multiply with a constant that is about 2.05. I don't remember the number exactly. So if you had a head that flowed 250 cfm at .500 lift take the 250 times 2.05 and you come up with 512.5 HP. That is theory of course but gives and indication to compare heads. It is thought that the number around .400 lift is the one to compare with other heads. Allen

StealthElephant

CFM * 2 * Volumetric Efficiency

So if your heads flow 240CFM * 2 = 480HP, but most engines are only 80-85% volumetrically efficient, so 480 * .8 = 384HP, and thats a very generic number, not taking into account midrange flow numbers, not just .5 flow.

MonteMan357

anyone know any more on these heads...are they worth it or just hype? Competition Products sells them assembled for $860

Orr89RocZ

iTrader: (20)

found someone's flowbench of the 215 platinum heads vs motown 220s, this was with 2.08 valve and 4.155 bore
on 2.02 valves and 4.03 bore, numbers generally reduced 5%

the platinums are abit better than the old eagles even with bowl blends. fine out of the box head, but like most all manufacturers, the heads dont quite flow as much as advertised. they do have alot to be gained in porting tho

dart 215
intake
200 139
.300 192
.400 227
.500 246
.600 260
.700 268
.800 264 cfm


exhaust
.200 139
.300 142
.400 168
.500 184
.600 191
.700 192

Motown 220
intake
.200 128
.300 186
.400 219
.500 241
.600 260
.700 268
.800 262

exhaust
.200 113
.300 143
.400 168
.500 182
.600 188
.700 189

12secformula

I don't know about the new ones but I have a set of Aluminum Dart Pro 1 215's. They are advertised to flow 276 out of the box...they flowed 264. They can gain alot w/ a nice port job tho. I just had mine ported and they now flow 297/215...they are not max ported by any means either. The mid lift numbers are also impressive, especially since I got them and had them ported for less than AFR's or Trick Flow's and they flow better too. If I were you guys I would not pay that much for an Iron head, when You can get the Aluminum ones for the same price. If you plan on running them outta the box...I would spend alittle more and get a better flowing head. I am selling mine, so if you guys Know anybody send them my way. lol

shawnc16

My buddy just bought a set, damn those things are heavy but they are nice, ithink its like 8 lbs heavier per head than stock heads.