Iron or Alum Heads?
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Iron or Alum Heads?

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    Default Iron or Alum Heads?

    Well The alum heads i want are 2300.00 and a set of fully ported irons are under 1000.00 but i want to run 11.5 to 12.0 comp ratio to get the 650-700 hp out of my bbf.....is anyone running irons on pump gas or maybe with additive with that comp ratio?

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    Senior Member W.O.T's Avatar
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    im running iron merlins on my bbc lookin for more ponies and less weight with aluminum heads. maybe darts or brodix if the budget permits. alot less weight with the aluminums.
    Last edited by W.O.T; 04-10-2008 at 12:59 AM.

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    Quote Originally Posted by 81bahner View Post
    Well The alum heads i want are 2300.00 and a set of fully ported irons are under 1000.00 but i want to run 11.5 to 12.0 comp ratio to get the 650-700 hp out of my bbf.....is anyone running irons on pump gas or maybe with additive with that comp ratio?
    If your running it in your Bahner iron heads will work just fine. aluminum is really nice but I don't think you need it for that boat. If your running pump gas you might want to lower the comp. a little. Keep us updated on what you decide.

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    Well i know the alum's will be lighter and make some power diffrence, but i have allways had hi comp engines with alum heads just wondering if running 12.1 and under is safe with pump gas on irons.....

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    Quote Originally Posted by gone4weekend View Post
    If your running it in your Bahner iron heads will work just fine. aluminum is really nice but I don't think you need it for that boat. If your running pump gas you might want to lower the comp. a little. Keep us updated on what you decide.

    Thanks......and why do u say it would be ok in a Bahner?

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    Quote Originally Posted by 81bahner View Post
    Thanks......and why do u say it would be ok in a Bahner?
    Nothing wrong with a Bahner. was just making sure you were not talking about a weekend racer ( cp, daytona, ect) then I'd go alum. and such.

    Bahner works great Ford's make good torque and jet love that. Iron heads work fine as long as your not trying to get max HP out of the motor. (race)

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    Quote Originally Posted by gone4weekend View Post
    Nothing wrong with a Bahner. was just making sure you were not talking about a weekend racer ( cp, daytona, ect) then I'd go alum. and such.

    Bahner works great Ford's make good torque and jet love that. Iron heads work fine as long as your not trying to get max HP out of the motor. (race)

    Nope just trying to get a dependable (somewhat) 70 -75 MPH boat i want 650 hp idealy......

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    If you are aiming for 12-1 CR and pump gas you had better REALLY know what you are doing and have experiance doing this type of build. Alluminum heads will be tough enough to do, iron heads next to impossible because of the lower thermal loss with iron. Not saying it is impossible, but damn close.
    If you are looking to build a max effort (high CR) pump gas engine alluminum heads will help, chamber and piston design will be critical along with proper cam shaft and ignition.
    For the everyday guy I would suggest 11-1 max for alluminum and 10-1 for iron. Even using these limits the above mentioned combustion chamber, piston crown design, camshaft and quality (crank trigger preffered) ignition system are still big factors.

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    I agree with Warp, 12:1 is asking for too much on 91/92 octane premium unless absolutely everything is perfectly happy. You're very likely to see either melted parts, or 100LL fuel in your future.
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    Default alum vs iron

    Someone once told me (round a bout) that iron heads are better for a lake boat as aluminum heads and an iron block expand and contract differently, that over time of heating it up and cooling it down eventually will lead to problems with everything (valvetrain) staying lined up, problems with valve lash needing to be continually readjusted, and I forgot the rest that he said. Thoughts?

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    Resident Ford Nut Sleeper CP's Avatar
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    For the most part I agree with Warp Speed on this.

    Personally I wouldn't try to exceed 11:1 on pump gas with cast iron heads. You can do it, but I think with the load your boat will be putting on that engine you're going to have to turn your timing way down and that will take away some of the power you're trying to build.

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    Seriously off center slowride's Avatar
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    I'm building a 545 and have decided to use iron heads and stay around 10:1. It's a river boat, and I don't want the headaches associated with corrosion in aluminum. I'll give up a few horses but still be able to run pump gas and it'll live a long and happy life.






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    Quote Originally Posted by slowride View Post
    I'm building a 545 and have decided to use iron heads and stay around 10:1. It's a river boat, and I don't want the headaches associated with corrosion in aluminum. I'll give up a few horses but still be able to run pump gas and it'll live a long and happy life.
    Iron heads will be better for a lake "pump gas freindly" engine. It will retain the heat in the heads and make for better combustion in the chamber. You lose on the weight savings but make up for it on the total package if your building that way. I think Paul "lakes only" could get more in depth on this topic.

    Is this stroker going to go in the circus boat? That would be a REAL sleeper then..

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    Quote Originally Posted by Futs View Post
    I think Paul "lakes only" could get more in depth on this topic. ..

    You took the words right out of my mouth
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