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Old 04-26-2017, 01:40 PM   #1
BUBBAS IGNITION
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Default BIG BOY FLAT HEAD THE 337 (butt change) n

We call this a "butt change" , the 337 doesnt have mechanical advance and this is the fix for having full mechanical advance...

http://www.bubbasignition.com/butt-change--.html
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Old 04-26-2017, 01:58 PM   #2
Pilot31135
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

That's pretty cool. I bought a lincoln distributor and got rid of the 885fg governed carb and governed distributor. Wished I'd have bought one of your Butt conversions.


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Old 04-26-2017, 02:09 PM   #3
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

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Originally Posted by Pilot31135 View Post
That's pretty cool. I bought a lincoln distributor and got rid of the 885fg governed carb and governed distributor. Wished I'd have bought one of your Butt conversions.


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Old 04-27-2017, 09:19 AM   #4
Capitan Insano
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

I make aluminum finned heads for those
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Old 04-27-2017, 09:26 AM   #5
19Fordy
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

Capitan, If possible post a photo of the heads you make - top and bottom.
Would be neat to see.
I commend you for making them.
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Old 04-27-2017, 12:28 PM   #6
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

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I believe Capitan is H&H Flatheads. Here is a link to the 337 heads http://www.flatheads-forever.com/web...product_id=276.
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Old 04-27-2017, 02:43 PM   #7
Bruce Lancaster
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

Obscure factoid: The first year Lincoln 337 had an Autolite distributor with proper centrifugal advance and vac can. '50 and up got the worthless Holly distributor.
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Old 04-27-2017, 03:34 PM   #8
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

Yes check out my web site I have them on my online shopping cart
www.flatheads-forever.com
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Old 04-28-2017, 05:54 PM   #9
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

I saw those heads and the two intakes. They look awesome. Can't do it now, gotta finish the F-8 then maybe then...[emoji1591]


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Old 04-28-2017, 07:20 PM   #10
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

Nice looking combustion chamber. Looks like you can use a power tip plug. What is the CR on a stock engine.
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Old 04-29-2017, 04:19 PM   #11
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Default Re: BIG BOY FLAT HEAD THE 337 (butt change) n

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Nice looking combustion chamber. Looks like you can use a power tip plug. What is the CR on a stock engine.


A whopping 6.8 to 1! Here is a little better view of the lincoln distributor.



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