Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

ROCHESTER QUAD ..................

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Old Jun 6, 2001 | 03:25 PM
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ROCHESTER QUAD ..................

REBUILD KIT CAME WITH 2 BASE GASKETS,


ONE IS 1/4 INCH THICK OPEN IN THE MIDDLE

AND THE OTHER IS 1/16 INCH THICK AND SECTIONED OFF IN THE MIDDLE FOR THE PRI. AND SEC. PORTS

WHICH ONE SHOULD BE USED ???

[This message has been edited by TACH001 (edited June 06, 2001).]

[This message has been edited by TACH001 (edited June 06, 2001).]
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Old Jun 6, 2001 | 04:43 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
In general, when doing a carb kit, use the piece that looks like the one you took off.

Personally, I like that thick one.

------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. 0.030 over 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlock header mufflers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, LT MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1/95.5 @ 5800' Bandimere.
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Old Jun 6, 2001 | 04:51 PM
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well with the thin one it is a direct drop right in to the correct port,

as for the thick gasket it would cross mix and the side with higher vaccum would run more powerful then the other

i am seeing the whole idea wrong or am i just nuts ?
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Old Jun 7, 2001 | 04:54 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The thick, open gasket actually helps even the two banks out. Its main advantage is better heat isolation between manifold & carb.

You didn't say which type is currently being used, but the thick is the most common I've seen.
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Old Jun 8, 2001 | 01:26 AM
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well i was using the thick gasket, but i put the thin one on and it seems to run much better
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