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impco 425 to spread bore

Nuts

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Joined
Sep 15, 2011
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1,361
Location
Middletown Ohio
Is there a factory or aftermarket throttle plate assembly for a spread bTore intake that a 425 mixer will bolt to? Right now I have two adapters and the throttle plate under the mixers and it looks like I'm running a tunnel ram. I'd like to get them as low as possible. The wood block isn't one of the adapters I'm talking about!
 

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I have a spread bore to 425 adaptor and spread bore base plate i will sell ya $50 i just bumped it in the for sale
 
altfuel1991 said:
Do you have a dual carb manifold that takes spreadbore base plates? I didn't know they existed.
pretty sure thats what this is, or maybe I'm backwards on my terminology???
 

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The Carter base plates have a slightly narrower bolt pattern than the Holley pattern. A spreadbore throttle plate has small front butterflies and huge rear ones and the bolt pattern is wider than both of the others.
 
:dunno: I did not know that. Thanks for the info :dblthumb: Despite not knowing what the hell I had I got the mixers to bolt to the intake with throttle plates lol
 
This is mine with 1" adaptor carter to holley with holley base
 

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I presidentail solutioned mine and made two 3/8" thick adapters that lets the throttle plates bolt to the intake. I'll post up a picture when I get home sunday.
 

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