I agree with the over estimates on HP without more data, specifically head flow numbers and type of exhaust, especially engine number 1. Our std. 598 cubic inch engine with fully ported heads and at 9.2 to 1 compression is a 750 HP engine at 5400.

Rod

The heads on engine #1 are Dart Pro 1 aluminum heads with bronze guides. This is the only info I have on these heads.

if you have the money go with the KE 675,they are expensive for a reason,carillo rods,callies cranks,quality valve gear ,one year warranty and there efi so you wont have to tune like a carb motor.Engine #1 hp is rated at 5900rpm,that is to many rpm for a 4.5" stroke to be reliable over time,also the bravo is not going to like those rpm.

4.5" stroke at 5900rpm will not like it very long!
I like the blower motor idea better-smoother idle, less tinkering, better fuel economy, option to go more hp later!

Both of these combinations have good and bad points. Neither really have enough oil capacity for 600+ci engines. We like to see at least 14 qts. The stroke on these combinations are so great that in smaller pans, the crank sloshes around in the oil creating turbulance and more heat. 10.5/1 compression is entirely too high for a marine pleasure engine. Both are using good components, except the Mercury ignition, MSD only. 725 is realistic, 825 is optimistic, but w/ 10.5/1 it is possible. Our 600 ci naturally aspirated engine makes about 750 at 5500. Our 600 ci EFI makes 700 at 5000 RPM and increases to about 750 at 5500 depending on cam selection. Both come w/ 6 month warranties and are custom painted w/ House of Kolor paint. Feel free to give me a call if you have any questions, as I am more than happy to help you.

Steve
504-415-6681

Either package looks good, depending on what you want. If your heart is set on N/A engines, and one of these two engine builders there are a few things to look at.

- Which has a better name (resale value)
- Which one will be easier to get to WHEN you have a problem
- Which works better with your boat builder, or rigger
(you don't need problems later, and people pointing fingers at the other)
- Who do you feel more comfortable with
- Which will taylor the package to what YOU want and need (HP, pump gas, engine color, accesories etc)

I personally like # 1. I like the aluminum heads but also the dart intake on # 2.. The ignition on # 1 is better. The aluminum heads will allow you to run more compression on the same type octane plus you can fix aluminum. What about the rotating assembly?
All personal preferences

I have had issues with the Iron Eagles. Currently run Pro 1 and have had no issues. It would depnd on the builder in this case, my .02

Hope it's not a problem bringing this back to the top, but I had a thought you might use.

Which builder has been building the package the longest and will give you the list of people who bought the package a year or more ago so you can call for satisfaction?

Otherwise, warranties talk and the others can walk.

Option #1 is my choice!! Then again I am running 13.2:1 compression so 10.5 is low to me. If the proper cam profile is picked you could run 10.5:1 on pump gas (93 octane). In order to get 6000 RPM performance in the 825 HP range a solid roller cam is likely required as well as good flowing heads. I know for a fact if the cam gets to aggresive it will cause tons of valvetrain problems and those are expensive.