4 Barrel intake and carb

[19joel65]

I want to re place my 2 barrel intake and carb (autolite 2100) and replace it with a 4 bbl intake.

1) are all the intake venturi holes the same diameter and if so what carb would be the best for this application? I want to use the vehicle as a daily driver for the time being.

 

[2+2GT]

Typically Ford used square-bore 4v on the 289, 302, and 351W. The spreadbore showed up on the 351C in 71. If you stick with the rest of the engine as stock, use a 4100 Autolite 1.08 size.

 

[htwheelz67]

if its stock a weiand 8124 intake and a road demon 525-625 vac sec carb or an edelbrock 500-600 carb, you will get the most hp with the demon but siplicity with the edelbrock.

 

[19joel65]

2+2 GT Thanks for the post.

I purchased an intake for a 289 that has four holes and stated it was correct for HiPo 289. would the 1.08 still work on this intake?

 

[2+2GT]

2+2 GT Thanks for the post.

I purchased an intake for a 289 that has four holes and stated it was correct for HiPo 289. would the 1.08 still work on this intake?

Yes. Oddly enough, the 289HP used the same intake manifold as the 289 4V. You'll need to have the 1" spacer plate under the carb.

 

[19joel65]

2+2 GT Thanks, I feel like I am asking basic questions that I should know but until recently have been out of the Mustang loop. If I can't find a 1.08 can I settle for a 1.12?

 

[runawayabc123]

2+2 GT Thanks, I feel like I am asking basic questions that I should know but until recently have been out of the Mustang loop. If I can't find a 1.08 can I settle for a 1.12?

The answer to this is both YES and NO!

It is yes if it is the mustang carb, the 1.12 intended for a small block.

It is a NO! if it is the emissions friendly carb intended for big blocks.

Some will claim it doesn't matter and other will claim the big block carb just won't run right.

I choose to stay away from the 1.12 and eventually lucked out on buying an engine that was taken apart but included the correct carb and a few other useful parts for me.

 

[2+2GT]

If you are using the stock cam you are better off with the 1.08. If you upgrade the cam, then a 1.12 is in order, but as mentioned, it must be recalibrated for the 289 engine.

 

[D.Hearne]

2+2 GT Thanks for the post.

I purchased an intake for a 289 that has four holes and stated it was correct for HiPo 289. would the 1.08 still work on this intake?

I hope you're not the one who bought that iron 289 4 bbl intake on ebay last week for $200 that the guy listed as a 289 Hi-po unit. If you were then you paid about $150 too much for it. Just me, but a better carb for it would be a Holley 570 SA.

 

[D.Hearne]

but siplicity with the edelbrock.