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#1
09-06-2015, 01:53 PM
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Carburetor Advice
I am upgrading the 463 in my 63 Tempest with an original wenzler tunnel ram, solid roller, and 310 ported Kauffman Dports. Engine builder wants bigger carbs than the early 60s Buick AFB's I had on my Offy and I agree I need to upgrade. Suggestion is two 750cfm carbs. Anyone have experience and suggestions which models I should go with?
I want to stay within the NSS requirements of an AFB styled carb. Thanks!
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A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed. 1966 GTO Hardtop - PS 14.84 @ 97mph |
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#2
09-06-2015, 01:56 PM
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max wedge carbs.Check with john 61-63.He built me a set for my bathtub intake.Tom
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#3
09-06-2015, 03:52 PM
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I am running a set of Carter Competition Series 9755S 750cfm on mine.
Mods include, removing choke and milling off choke horn. Hi Flow Edelbrock Needle and Seat Assemblies. Fuel pressure needs to stay at 5.5PSI as it is very easy to over power the Needle and Seats in these. I am running the original Wenzler on a 440inch, Eheads that flow around 335 CFM, Small Solid Roller. I have tried the 600's and could not get enough fuel through them. The 750's were good for 3 tenths.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
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#4
09-06-2015, 05:20 PM
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Avoid the Edelbrock versions. They seem to make fuel disappear fast when they sit.
Mopar max wedge (recalibrated) are a great choice but usually pricey. Carters original "Competition Series" 4761 or 4762(chokeless and calibrated for dual quad apps ) are a great starting point as are the 9755 carbs Mike Davis suggested. A note on choke horn removal... depending on air filter base or scoop pan, and how air gets directed, can impact how bleeds behave. I have a 4761 minus choke tower that could stand to have primary throttle shaft bushed and know where a 9755 is that is probably for sale(seems good condition and missing choke plate and choke linkage) My other 4761 may still be at a friends place. It was NOS never used till he borrowed it.(I have his Holley for ransom) I'll check up on it. Too bad you cant run Holleys... a pair of 750's mech or vac secondaries would work well. |
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#5
09-06-2015, 05:29 PM
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750 Edelbrock's would be my suggestion. I ran them for 15 year on a bathtub and now a guts ram. My current engine dynoed 924 hp with them. I changed to the 800 cfm Edlebrocks and didn't gain any E.T.
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#6
09-06-2015, 06:23 PM
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As Joes says the E carbs race well.They have issues with street driven cars.Tom
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#7
09-07-2015, 07:46 AM
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Quote:
Second choice would be: 4759s - 625 CFM with manual choke 4760s - 750 CFM with manual choke 4762s - 750 CFM with no choke Jon.
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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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#8
09-07-2015, 05:08 PM
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800 Edelbrocks
Quote:
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#9
09-07-2015, 05:39 PM
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I remember that testing Joe.
750 carbs dialed in ran great. Swap to the (new at the time) 800s and no change in et on the track. If I remember right the testing had to be at Norwalk years ago. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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