Hello all,If I want to install a 57-58 style Holley carb on my 56 292 4bbl   do I also have to change the manifold?I know I have to replace distributor.What else is required as far as changing?Any input appreciated.Thanks Mark

  

Hey Mark;;  Casco has an adaptor that will allow you to install the new style carb to the older smaller manifold..  Hope this helps!!   God Bless

Eddie

Lake Forest, Ca. 92630

You must have the "9425-A" four barrel manifold that fits the teapot? Look for a "9425-B" version (57 and later) that has the Holley 4150/4160 mounting pattern. Lately they've been selling for big bucks on e-bay - maybe someone on the site can fix you up for less.

The four throttle bore holes in this "B" manifold will fit a Holley 390 cfm carb directly - but if you use a 600 cfm - you will either have to have the deck milled flat and the four holes bored out to match the bigger carb - or use a phenolic spacer / adapter to space it up a bit and smooth the air entry into the smaller holes.

You can also get an adapter/spacer from Speedway to fit on your "A" manifold - I don't have the part number at hand - but its a decent way to get the newer style carb on your old style manifold (without big bucks).  

 
 Steve Metzger       Tucson, Arizona

I'm with Steve on this one, go with the 57 & up B manifold and later distributor and see a REAL improvement in power and fuel milage. Just using an adaptor on the a manifold for a later carb wil be only a little better than the teapot because you will lose some of your cfms thru the adaptor thus keeping the engine from it's full potential.

-Gary Burnette-

Hi Steve,What is the difference between the 4150 and 4160?You mention 390cfm and 600cfm carbs.I thought the 57 carb was a 4160 only?I am not familiar with the differences in the 57-up carb/manifold setup.I am just looking to replace this problem setup I have now.Not looking for highest performance.Is there a suggested combination for good everyday use?Any input appreciated.Thanks Mark

  

Mark:

Do you have the teapot fixed except for the off idle stumble?  Maybe a swap to a later distributor will help that problem.  You're going to swap it anyway when you swap carbs, so maybe try that first.

John

John - "The Hoosier Hurricane"

The base plates of the Holley 4150/4160 carbs are basically the same layout - bore size at the throttle changes as the cfm rating increases - but the four screws that clamp it down on the manifold are in the same place.

"In general" the Holley 4150 carbs have both a primary and a secondary metering block with removable jets (sandwiched between the fuel bowls and the main body) - and the 4160 is a "cheaper" version of the carb that uses a "metering plate" for the secondary fuel control rather than a "metering block".

The cheapest easist simplest one to find is the "1850" vacuum secondary version (this "list number will be stamped on the front of the choke housing). It is rated at 600 cfm - a bit big for our applications - but not too big so long as the vacuum secondaries are kept under control.

 
 Steve Metzger       Tucson, Arizona

Strikes me that a mid 60's to 70's Autolite for a 289/302 would also work well. Many of those carbs on the earlier SBF were in the 450 to 500 cfm range. You should use a late model distributor (57 up) when you do this. If done well, you'll end up with better fuel mileage AND performance. Not a bad deal!

Frank/Rebop

Bristol, In ( by Elkhart) 

Guys,



I'm a bit curious re: the comments about 57-up distributors delivering better millage? My teapot/Loadomatic setup 292 gets mpg in low 20s, and I drive like a maniac. I thought the main advantage of the later dist. (aside from carb. options) was mainly the ease of re-curving for performance?

Is it the ability to run higher initial timing (and limit total advance) that gets you better mileage? Would it make up for the expected lower economy of a bigger carb?

6 VOLTS/POS. GRD. NW INDIANA

I have a 390 CFM carb and adapter for sale if you need one. I just took it off m ine to install trips. eadgpdhome@msn.com

55Birdman  Hickory NC