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Offenhauser and holley 390 orientation

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brianbronc

Offenhauser and holley 390 orientation

Got the intake on. Does the holley 390 have the electric choke facing firewall or fan? Or facing the fender?

Gary Lewis

Re: Offenhauser and holley 390 orientation

Administrator

I don't know, but I'd think that the throttle linkage, and potentially the linkage to the transmission, would be the decision maker.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

85lebaront2

Re: Offenhauser and holley 390 orientation

Administrator

In reply to this post by brianbronc

First, if the manifold is the dual port style, the primaries should feed the smaller passages. Other than that, I always preferred the primaries outboard on an in-line engine.

We had a boy that worked for us at Preston Carburetion. He had a Chevy pickup with a 250 ci 6. He got a wild hair, bought a two 4 barrel intake and wanted some carburetors for it. I handed him two Stromberg 4 barrels from early 50s Buicks. They actually ran pretty good sideways on the engine.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

brianbronc

Re: Offenhauser and holley 390 orientation

This post was updated on .

Sorry.. it is the Offy Dual port intake

How to tell the smaller passages on the intake. ??

85lebaront2

Re: Offenhauser and holley 390 orientation

Administrator

If you look at the head face of the intake, unless they have changed since I had one on my 260, the ports are roughly 1/3 - 2/3 with a divider across them. On the V8 ones the primary barrels connected to the smaller passages. Here is a picture of one with a Holley (unknown size) on it, note the primary barrels are outboard.

Bill AKA "LOBO" Profile

brianbronc

Re: Offenhauser and holley 390 orientation

in that orientation... my throttle linkage hits the intake...

85pig

Re: Offenhauser and holley 390 orientation

Are you using a spacer?

The Offy "C" intake runs the carb in the "standard" direction. With it my linkage is fine with a 1" spacer; not sure if the linkage would drag the top of the intake without it. Interesting info.

1985 F150 4X4 300 I6 4-Speed
1970 Torino Cobra "Twister Special" 429CJ 4-Speed
1965 Mercury Comet Caliente Convertible 331 5-Speed

brianbronc

Re: Offenhauser and holley 390 orientation

no spacer, but will get one and try

85lebaront2

Re: Offenhauser and holley 390 orientation

Administrator

In reply to this post by brianbronc

That is probably because Holley decided a number of years ago to put "universal" (Chevrolet style) throttle levers on their carbs. The "Powerglide" tail hangs down in the way on an in-line engine.

Bill AKA "LOBO" Profile

85pig

Re: Offenhauser and holley 390 orientation

It's not just Holley; just checked my Edelbrock AVS, and without a spacer, it drags a runner too - as well as possibly hits that manifold bolt.

1985 F150 4X4 300 I6 4-Speed
1970 Torino Cobra "Twister Special" 429CJ 4-Speed
1965 Mercury Comet Caliente Convertible 331 5-Speed

James191145

Re: Offenhauser and holley 390 orientation

In reply to this post by brianbronc

The carb is oriented where electric choke is facing radiator and throttle lever towards firewall. This orientation is for the 6019DP manifold.

"Brother Charles" 1984 F-250 6.9IDI 4x4 BWT19
"Lacy" 1984 F-250 6.9IDI 4x4 ZF5
"Tommy" 1985 F-250 4x4 300ci ZF5

85lebaront2

Re: Offenhauser and holley 390 orientation

Administrator

In reply to this post by 85pig

Same thing, the "Powerglide tail". A spacer will solve it.

Bill AKA "LOBO" Profile

85lebaront2

Re: Offenhauser and holley 390 orientation

Administrator

In reply to this post by James191145

The only question I would have is which side of the manifold feeds the larger portion of the intake ports?

Bill AKA "LOBO" Profile

brianbronc

Re: Offenhauser and holley 390 orientation

In reply to this post by James191145

previous in this post it was mentioned that the throttle linkage faces the radiator...?

James191145

Re: Offenhauser and holley 390 orientation

On the c series , it is a single plane manifold. Doesnt matter which orientation on that one. The dual plane requires throttle toward firewall.

"Brother Charles" 1984 F-250 6.9IDI 4x4 BWT19
"Lacy" 1984 F-250 6.9IDI 4x4 ZF5
"Tommy" 1985 F-250 4x4 300ci ZF5