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Ford 9N, 2N & 8N Discussion Forum
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Carb swap

Author  [Modern View]
Tom Jubilee

01-29-2014 17:46:22

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Question to y'all..Can a NAA carb be put on a 631 and still work?

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01-30-2014 06:12:30

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 Re: Carb swap in reply to Tom Jubilee, 01-29-2014 17:46:22  
as old said.

if it bolts up.. yeah.. 'probably' fine.

here are the issues you have to look at.

there are 2 5/16 and 2 3/8 spaced studs on carbs.

you have original manifolds made for each size.. and then universal manifolds made for both.

Some have even takent he small manifold and filed out the ears to put the large carb on.

as long as the engine in the 631 ( 134ci ) has not been swapped for a 172 CI with associated manifolds and such.. IE.. should be fine if it bolts.

And yeah. you can run a 172 on a 134 carb and be derated..

find out what carb you have.. and that will tell you the mount size. match up that mount spacing, and then get a carb in that mount spacing for the CI of your engine. which, again, if original.. is 134ci.

and yeah. I have seen lots of stuff swapped.

I have a 950 wearing the small manifold of a 134ci engine..a naa and it's wearing it's carb too! ( it's what i had on hand.. and the 950's carb was shot and manifold broke... )

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Ultradog MN

01-29-2014 18:39:29

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 Re: Carb swap in reply to Tom Jubilee, 01-29-2014 17:46:22  
Same 134 ci engine so I assume it would.

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01-29-2014 18:38:59

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 Re: Carb swap in reply to Tom Jubilee, 01-29-2014 17:46:22  
If I remember right the carb on the NAA is a smaller mount so it will not bolt up unless you have the universal manifold. The NAA uses the TSX428 and the 601/631 uses the TSX692 This if going by a catalog I have that list carbs. It also lists a number of others for the 600/601s. If it will bolt up yes it would work since both engines if I remember right are the 134

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