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| | | | Joined: Jul 2000 Posts: 19 New Guy | | New Guy Joined: Jul 2000 Posts: 19 | ...on a 235 sacrilege? With the cost of fuel and the lousy efficiency of the Rottenchester, I'm considering the swap.
I'm looking to keep the manual choke, so which 94 would I need? And does the 3-bolt Holley just slip right on my manifold, or is there a hoop I need to jump through?
Thanks for helping an old idiot who only knows enough to like his 55.1 3100.
Last edited by Kermit; 07/26/2012 7:28 PM.
| | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | You'll need an adapter to mate the Holley to the Chevy manifold. The most common 3-bolt Holley carb was used on a 239 cubic inch flathead V-8, so the calibration should be pretty close. It will have a 15/16" venturi diameter. Watch out for the slightly larger carb that was used on the 55 Ford 272 engine- - - -it has 1 1/16" venturis, and it will definitely create a flat spot on acceleration.
Jerry
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| | | | | Joined: Apr 2001 Posts: 268 Shop Shark | | Shop Shark Joined: Apr 2001 Posts: 268 | You might look into a Holly 660A1 They were on the 52-53 GMC, may be later 302s. That is what my 53 GMC 454-30 has on it.
It is a 3 bolt flange setting on some kind of adapter.
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1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The GMC Holley has the large venturi like the 55/56 Ford had and it will stumble during acceleration. The 239 Ford is about the correct size but it will be designed for the Load a Matic distributor which means it will have port vacuum. You can either run a distributor with no vacuum control or you can convert the port vacuum to manifold vacuum. | | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | The Holley 1bbl carb was used on several Ford engines through the years. Ones from either the 200 or 250 inline six work with a bit of adaptor and linkage mods. Steer clear of the ones with the clear glass on the float chamber as they tended to leak. They are a very squat carb so used them where height clearence was an issue. I can't remember if the 240 had a one bbl but none of them gave much carb problem.
Evan
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Why not use a 68 up Roch. Monojet. It will be a simple swap & they have good fuel metering & can be taylored to the engine.
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