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#1
07-24-2014, 11:50 AM
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Carburetor base plate, shim plate, re-installing ???
I don’t remember how the carburetor base plate (or gasket) and shim plate were installed. As I recall, the gasket sets on top of the manifold, then the shim plate, then the carb. The PY magazine (catalog 12C, page 82) states the best install is two gaskets with the shim plate in between even though this is not stock.
Please advise.
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1967 GTO, hard top, 400 Block, Butler Performance Build, EFI Holley Sniper, Tremec 5-Speed, Moser 373 Rear, 4 Wheel Disc Brakes |
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#2
07-24-2014, 05:34 PM
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On my 69 Gto I was told to ditch the shim plate and just use the gasket. On my 66 I just used the black gasket like the one shown in your pic underneath the shim plate. I have the Carter AFB carb on mine, don't know if that makes any difference or not. I'm sure someone will eventually chime in with the right answer. Not sure what's needed if using a Holley carb.
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1966 GTO Vert automatic. 1969 CR Judge Ram Air III 4sp Pattern Car. 1969 GTO standard 350HP TH-400. 2006 GTO Phantom Black 6spd. 1972 Formula 455HO Ram Air. 1976 LE Trans Am 50th Anniversary Edition with T top. 1976 Formula 350. 1977 Grand Prix Model J 350. 1978 Trans am 400 Pontiac. 1979 Trans am 403 Olds. 1968 Olds 442. 1971 TR6. |
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#3
07-24-2014, 06:56 PM
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On my '67, with it's one-year-only exhaust passage on the intake under the carb, I did the sandwich install: gasket, plate, gasket. Works perfectly.
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Jeff 
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#4
07-24-2014, 07:18 PM
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On my '67 OHC Sprint, the carb gasket had a cutout passage open to the heat riser below, the stainless plate installed on top of the gasket, the passage therefore heating the stainless plate and the entire carb base.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#5
07-25-2014, 05:06 AM
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Quote:
Do you know if this plate was used on the 69 GTO with the base 400 engine and Rochester carb, or was it only used on the 67 GTO? I was told the 69 didn't use the plate. Not sure why it was on the car if that's the case. This was a one owner car and the plate looked as if it had been installed for a long time. Thanks.
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1966 GTO Vert automatic. 1969 CR Judge Ram Air III 4sp Pattern Car. 1969 GTO standard 350HP TH-400. 2006 GTO Phantom Black 6spd. 1972 Formula 455HO Ram Air. 1976 LE Trans Am 50th Anniversary Edition with T top. 1976 Formula 350. 1977 Grand Prix Model J 350. 1978 Trans am 400 Pontiac. 1979 Trans am 403 Olds. 1968 Olds 442. 1971 TR6. |
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#6
07-25-2014, 07:16 AM
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The metal shim was 67 only as was the channel running from the exhaust crossover, as well. I believe because the channel could get clogged over time was likely why it was discontinued. That and if the shim was forgotten the carb can be damaged.
If the intake is off of the car the two holes on the carb mating surface can be tapped and pipe plugs can be used to block the channel. Sent from my iPhone using Tapatalk |
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#7
07-25-2014, 12:08 PM
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In any case, i noticed i would create vacuum leaks when i did R&R on the carb with that stainless plate. Always thought it was a dumb idea.
George
__________________
"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#8
07-25-2014, 09:04 PM
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66 used the gasket only... as far as I know. It's all I'm using... no plate between 2 gaskets. Just the single gasket and no problems.
__________________
 Gary Get in, ShuT Up, Hang On! Member of the Baltimore Built Brotherhood MY GTO built 4th Week of March 1966 "Crusin' Is Not A Crime" Keep yer stick on the ice. |
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#9
07-25-2014, 09:18 PM
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Quote:
We have winner! |
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