Carb spacers?
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Junior User
Joined: Jan 2006
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Carb spacers?
Im looking for the best carb spacer to run on my 400. Cant decide if i should go 1 inch or 2? Open or 4 hole? It will see mostly street and strip. Its a 2wd F-150 with a built 400. Any suggetions will be great.
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
I would use the tallest spacer that I could get under my hood, and I would use a 4 hole style. The 4 hole spacer helps to reduce turbulence in the carb venturi, which provides a better throttle response.
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
to add...any spacer that does not completely seperate the primary and secondary flow in a dual plane intake will hurt perfomance significantly. It attempts to turn a dual plane into a single.
Elder User
Joined: Jan 2004
Posts: 867
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From: Eastern Pa
The only way to know for sure is to install the manifold and carb and then use the cowl as a reference point and see how much room you have. There is no formula, it's measure as best you can and trial and error.
Posting Guru
Joined: Jul 2007
Posts: 1,355
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Im currently using a 2" single plane spacer with a dual plane intake in my 351m, I have a single plane intake but what would be worse for my mild low comp ratio 351m:
1. to use the single plane intake with the sigle plane spacers
2. keep using the dual plane with single plane spacers
???
1. to use the single plane intake with the sigle plane spacers
2. keep using the dual plane with single plane spacers
???
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Originally Posted by hollenjoe
Im currently using a 2" single plane spacer with a dual plane intake in my 351m, I have a single plane intake but what would be worse for my mild low comp ratio 351m:
1. to use the single plane intake with the sigle plane spacers
2. keep using the dual plane with single plane spacers
???
1. to use the single plane intake with the sigle plane spacers
2. keep using the dual plane with single plane spacers
???
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