Iron Heads
 

What are the best iron heads for an HP500 (carb) motor ? We lost one last weekend and it's time to rebuild both. These motor have 950 hrs on them if the blocks are good then we will reuse them but the heads must go.


Thanks
Joby:drink:

Wow! what kind of motor work (maintenance) did you do to get 950 hrs out of them?

Dart Iron eagles. Call Mark precision Marine he can help you out.

Yep- the Iron Eagle's are about the best. If you meant OEM, the 990 casting is about it. The 088 is good too- probably what was on your motor.

950 hours on a pair of Merc HP500's is pretty good---I'm sure they're gettin' pretty tired. Also, if you're looking to do a cam change/upgrade call RMBuilder/Bob Madara of Marine Kinetics in N.Y. He will get you the correct profile that will work the best for your application and what you want to do with the boat. 585-654-8583

Talk to Jim Valako about his Iron Eagles. He ports them to flow as good as a set of AFR's. They're good for a hundred hp or more over the GM heads.

http://hometown.aol.com/valakoracehe...raceheads.html

JimV's ported Dart IE heads were a big part of my 800+ HP results

I have Iron Eagles on my modified 500's..........

heads
 

I got 2 sets of GM 990 iron heads if any one wants them

Heads
 

I have a great et of 088 heads. ported and new Crower springs. Iconel valves 1.94 and 2.25 valves. I built them for a 700+ HP blower motor and then went aluminum. A perfect bolt on $1000.
$1,000.00
Bob

As you know - been thru this real recently.

The IE heads are real good. But supposed to be better ane the Edelbrock heads. PLUS they are like 70lbs lighter and build good HP. I have talked to lots of folks that have them and no issues thus far.

Have you pulled the motor out and/or torn it down yet?

Does this all apply to the dart alum heads?

About the best thing you can say for the Edelbrocks is that they're lighter. Nice price too.

Hand porting a cylinder head is not the most economical way to make power. It's on par with and sometimes more expensive than CNC. And the result is only as good as the person doing the work. There's much more to it than making the holes bigger.

But done right, the results can be impressive.

While you guys are talking heads what do you think about Pro Toplines? I just had to replace one of mine due to a few cracks.:(

They were a great head a few years ago. Head technology moves fairly fast Plus, they were bought out by RHS a while back.

Amsoil every 20 hrs and valve springs every 200.:drink:

Yes they are tired we lost 7 mph over the winter.:mad: And yes Bob is on my list of people to call. :cool:

We are looking at a lot of parts Edelbrock, Dart (Alum. Iron ) World ( Merlin II ) and AFR's . So many parts so many inputs. We just want to make the right choices ,I DO NOT want to do this twice. We run mostly in salt water so will aluminium hold up for another 12 years as the past heads have ?

Thanks again for all the help. :ernaehrung004:

Joby



To many parts to little MONEY!!!

Not yet , But when it came apart it did not sound good. The temp went to 165 and oil pressure went to 10 before we shut it down. We were running @ 4500 when the temp started to go up.:eek: I should have been watching the gages a little closer. :mad:

You'll need to either buy them hard anodized or have them done. They'll live well as long as you are diligent with your flushing and your salt-away application. Aluminum will allow you to run a bit more timing which will make more horsepower- simply due to their greater ability to migrate heat out of the combustion chamber, thus holding off detonation.

Don't get the Merlins. They are obsolete compared to all of the new offerings out there. Given the same care, iron will last longer.

what is the cost of the dart iron eagle, and how much more hp over stock 2000 hp 500 heads as i also am going to repower this winter mine have 430 hrs but still run strong.

Cast iron or Alum heads are similar in cost. The stock IE vs. std alum should deliver similar power results (close to same air flow). Alum is lighter and the cast iron is more durable.
If you plan on new springs, valves, retainers, etc, budget $2,500-4,000 per engine. A really good HP value would be to budget an extra $500-800 an engine and get someone like JimV and to do some mild port work. Jim could also help you with the intake and valve train selection.

Ttt :cool:

I think most agree that the best out of box iron head would be the Dart Iron eagles.

1. You need to know the goals of these builds. (HP TQ RPM, achievable within budget if one applies)

2. This is where you need to start talking with head and cam guys. like RMbuilder and JimV. If your not going to port the heads then RM could tell you which cam will work best with the heads you choose to meet your goals. If you choose to have the heads HAND ported you can tell JimV or any other GOOD porter the given cam specs and they can port the heads to FLOW THEIR BEST at the supplied lifts to get the most out of your cam and heads. Just because the CNC heads flow great at 0.720" doesn't mean it flows great at 0.610" where max lift of your cam is. This is where the hand porter can keep the velocity up with increased flow.

JMO

You are on the right track....it is a system. Both good sourses for info and both can do the work. Consider calling both to discuss your goals and budget.

Ttt

Iron eagles for sale
 

There are 2 sets of iron eagles in the swap section with lots of money just spent on them. They look like a great deal.

2 sets: Dart Iron Eagle Heads: 15100010 Intk: 308cc/Cham.: 119cc / Int/Exh: 2.25/1.88. Manley Valves, Isky Springs, $2246 per set invested 18 hours ago. Sell for $1200 a set or $2200 for both. + Shipping. Or Pick up! I'll take PayPal but perfer $$$ Return for refund if not happy!

[email protected] or 336-644-0666
Attached Thumbnails

I also have one spare set of Sonny Leonard ported Dart IE 308 with 105 CC chambers. You would need to use these heads with flat top pistons. Used Inconnel and titanium valves available.