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#1
05-30-2003, 11:50 AM
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I just replace the 400 engine in my 69 GTO with a 455 from a 70 Bonneville. I only have the original carb off the 400. Somewheres along the line I remember the 455 carbs were 850 CFM vs. 800 CFM for 400's ....is that correct or was that only Buicks and Oldsmobiles?
Do I need a 455 carb? Can I re-jet the 400 carb? What are your suggesstions. Just looking for superior street drivability. It has a Nunzi street cam with 6X heads and 3:23 gears.... |
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#2
05-30-2003, 11:50 AM
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I just replace the 400 engine in my 69 GTO with a 455 from a 70 Bonneville. I only have the original carb off the 400. Somewheres along the line I remember the 455 carbs were 850 CFM vs. 800 CFM for 400's ....is that correct or was that only Buicks and Oldsmobiles?
Do I need a 455 carb? Can I re-jet the 400 carb? What are your suggesstions. Just looking for superior street drivability. It has a Nunzi street cam with 6X heads and 3:23 gears.... |
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#3
05-30-2003, 12:54 PM
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What is the number on the carb you have?
All 455 carbs (except the 1971 HO and RA; and the 1973, 1974 SD) through the 1974 year were the same size as the 400 carbs with slightly different calibrations. Jon. Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#4
06-06-2003, 12:22 PM
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Rubber, go to this website www.dapa.org (Dallas Area Pontiac Association), click on the technical articles and read the articles on rejetting Q-Jets, and other articles on Q-Jets.
Good Luck, Elmer |
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#5
07-01-2003, 11:24 PM
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[deleted]
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Bought: 1970 Le Mans Sport Convertible (second owner,) Palladium silver, 350/2bbl (sigh) with Comp Cams 268H grind (installed by previous owner), TH350 Trans. Mods: Front suspension: Global West negative roll tubular upper arms, Del-a-lum bushings, Koni shocks, 12" disc brake conversion, 1.1" front sway bar, Rear suspension: Global West tubular control arms, springs, sway bar. Exhaust: Flowmaster 2.5" American Thunder system. Mostly complete: Firewall-forward engine compartment restoration |
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#6
07-01-2003, 11:26 PM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Elmer:
Rubber, go to this website http://www.dapa.org (Dallas Area Pontiac Association), click on the technical articles and read the articles on rejetting Q-Jets, and other articles on Q-Jets. Good Luck, Elmer<HR></BLOCKQUOTE> I was unable to locate the info you mentioned, is it in the "Members Only" section? If so, I can't get to it (not being a member...) Can you provide a direct link? Thanks!
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Bought: 1970 Le Mans Sport Convertible (second owner,) Palladium silver, 350/2bbl (sigh) with Comp Cams 268H grind (installed by previous owner), TH350 Trans. Mods: Front suspension: Global West negative roll tubular upper arms, Del-a-lum bushings, Koni shocks, 12" disc brake conversion, 1.1" front sway bar, Rear suspension: Global West tubular control arms, springs, sway bar. Exhaust: Flowmaster 2.5" American Thunder system. Mostly complete: Firewall-forward engine compartment restoration |
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