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| | | | Joined: Apr 2009 Posts: 232 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 232 | Does anybody know what year the spacing on the carb mounting flange changed from 2-9/16 to 2-7/8 ? I need 2 new carbs for my offy dual manifold and they are the larger ones. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | 1954 up had the wider spacing. The 216 had the narrow one & the 235 had the wider one.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | What size engine are you working with? Unless you have a very large-displacement engine like an overbored 235 or a 261, it's very likely you'll experience severe over-carburetion with two of the same size carb that was designed to function right in a single application. Why not get the stud spacing modified to the narrower dimension, and install two 216 carbs like the Carter YF, etc.? You will still have a net gain in total volume capability at full throttle, without so many of the issues with flat spots and other problems associated with having too much carburetor for your engine.
Jerry
Last edited by Hotrod Lincoln; 01/09/2010 10:17 PM.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | 1950 and upwards 235s and all 261s had the wider spacing.
All 216s and 1941-1949 235s had narrower spacing.
| | | | | Joined: Apr 2009 Posts: 232 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 232 | thanks guys The motor is .060 over and slightly higher compression after the head and block were surface milled to true them up. The puzzleing part is these same carbs worked OK on the old tired stock 53 motor that came out.I've tried NAPA , Advance auto my local parts guy and no luck Chevy classic is also out and has no cores currently.One of the carbs I had must have been from the 216 because you can see that someone elongated the holes to match the stud spacing on the manifod. The bore size is the same. | | | | | Joined: Dec 2005 Posts: 547 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 547 | Not to steal the thread or anything, but what is involved in modifying a 235 intake, to narrow the stud spacing, for 216 carbs?
58' 3200 235 3-speed/OD
| | | | | Joined: Apr 2009 Posts: 232 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 232 | check with "Hotrod Lincoln" on this forum | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | I like to drill the stud holes out and tap them to accept a 5/8" Heli-Coil, then install a threaded plug with LocTite to fill the enlarged hole. Then I drill and tap the plugs to accept the carburetor mounting studs on a closer center-to-center spacing. If I want to go back to the wider spacing, it's a simple matter to break the LocTite loose with heat, pull the offset-hole bushing out, and replace it with one that's threaded on center. Best of both worlds!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | Another method is to have a good welder fill the holes and redrill and retap for the proper dimension.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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