BBC Merlin Cast Iron Heads?
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BBC Merlin Cast Iron Heads?

  1. #1
    Gone in a Flash! Speed of Heat's Avatar
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    Default BBC Merlin Cast Iron Heads?

    Any comments pro or con on a set of Merlin Heads "Grumpy Bill Jenkins Series". Rectangle port. 310 cc intake runner. 2.25 intake valves. 1.88 exhaust valves.-This would be for a N/A 496 pump gas cruiser deal.-Cruising, skiing and occasional speed runs.
    Remember that the Ark was built by amateurs and the Titanic was built by professionals.

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    Not a thing wrong with those on a 496. Just be sure you where a back brace when you lift one.
    Chris Straub
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    3HP is an A$$ Whooping!!! JW

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    gn7
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    People actually pick those up? I usually let Mongo do it, or use the cherry picker! I had a bolt fall out of a Wieand Hi Ram, down the port, and well you know! First hit, it was in quench area and pushed the bolt thru the TRW in one blow and never phased the head. Those things are stout.



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    steelcomp was here
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    They are stout! And heavy! They'll make plenty of power, but they have to to haul themselves around.
    Nothing wrong with them except the weight.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Just another Wannabe Wannabe's Avatar
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    Check the seats. The very first run of those did not have enough interference and they came loose.
    If they are not the ones with problems, run them. My favorite heads by far! Well, O.K. My favorites are the 92 and 94 casting Merlins, but you get the idea.

  8. #6
    cfm
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    They are an okay head.

    If you have not purchased them yet and need/want cast iron heads I'd look at the RHS and Dart iron Eagle heads for some more performance.

    BTW: The Summit Brand cast iron BBC heads are supposedly from Dart too. According to rag mags just like Iron Eagle's but may have cheaper hardware.

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    Quote Originally Posted by cfm View Post
    RHS .
    You defineately don't want these heads.
    Chris Straub
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  10. #8
    cfm
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    More facts please.

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    Quote Originally Posted by cfm View Post
    More facts please.
    You know my number.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    steelcomp was here
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    Quote Originally Posted by Wannabe View Post
    Check the seats. The very first run of those did not have enough interference and they came loose.
    If they are not the ones with problems, run them. My favorite heads by far! Well, O.K. My favorites are the 92 and 94 casting Merlins, but you get the idea.
    I didn't know there were inserts in cast iron heads, or why there would be in a new head.

    AFA mechanics, I'd be sceptical of running any assembled head out of the box. They ALL need inspecting at minimum.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    cfm
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    Quote Originally Posted by cstraub View Post
    You know my number.
    Yes......But Why not share the info here? Are the old issues still present in the newer heads ? What exactly is up with them ? ie: The RHS's.

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    Quote Originally Posted by cfm View Post
    Yes......But Why not share the info here? Are the old issues still present in the newer heads ? What exactly is up with them ? ie: The RHS's.
    423 854 0007. . .if you don't have it anymore.
    Chris Straub
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    3HP is an A$$ Whooping!!! JW

  15. #13
    gn7
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    Quote Originally Posted by steelcomp View Post
    I didn't know there were inserts in cast iron heads, or why there would be in a new head.
    There aren't, Ole Wannabe is a little confused today. Possibly not reading the posts all the way thru



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    Quote Originally Posted by gn7 View Post
    There aren't, Ole Wannabe is a little confused today. Possibly not reading the posts all the way thru
    The merlins come with hardened exhaust seats. Insert type. They can be hard to see, they blend in ok if you don't look relatively close. Intake is just cast iron material, no "insert" or "seat".
    Wags
    They would be in there because it easier to throw in an insert than to induction harden a seat to take 250# of seat pressure.
    Last edited by wagspe208; 02-04-2009 at 07:24 PM.

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