Old 09-17-2022, 10:53 PM
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Mark Simiele Mark Simiele is offline
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Default NOS? 1967 resonators on eBay

I have never seen original full size tail pipes with resonators . Are they? They appear welded on one part and I always was told none of these exhausts were ever welded at least on the A body cars. If so quite different than the design of the 69 GTO versions that are on my Gardener exhaust.


69 GTO convertible Warwick blue w/parchment, 400 4bbl auto trans, #'s matching, frame off resto w/ 36 options and more coming.

67 Bonneville 428 convertible one of one Verdoro green w/parchment, documented GM brass hat parade car with every option for 67, non running MAJOR future project.
Old 09-17-2022, 11:25 PM
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muscle_collector muscle_collector is offline
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my dads 68 428HO bonneville came with them.

Old 09-18-2022, 10:56 AM
6d7gto 6d7gto is offline
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The sound from these resonators makes the Pontiac sound so sweet! I had them on a 1966 GTO back in the day. Best sound of any muscle car in my opinion. I also liked the sound of the Roadrunners. Not sure if the 1967 GTO came with resonators from the factory or not.

Old 09-18-2022, 06:44 PM
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That looks correct

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Old 09-18-2022, 06:47 PM
gto4ben gto4ben is offline
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67 GTO cars had resonators on the factory automatic cars. If I read the 67 GTO Assembly Manual correctly. it says Resonators "EXC. H.O. ENG W/MT & 242 W/MT. I still have one of my original Oldberg version from my 67 w/THM.
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Old 09-19-2022, 07:52 AM
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Jeff Hamlin Jeff Hamlin is offline
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
Old 09-19-2022, 10:17 AM
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David Brown David Brown is offline
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My 70 Bonneville has resonators. At one point with a new exhaust I tried without and hated the harsh sound. Installed resonators and as previously stated, sweet sound!

Old 09-19-2022, 11:27 AM
gto4ben gto4ben is offline
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The master parts list did have HT (Hydramatic Transmission) after the GTO for 67, suggesting the manual transmiision GTOs would not have them.

BTW, Thanks for uploading the parts list. It helped solve a mystery. I have these CDDC resonators dated H3E and H4C. I originally thought they were for a GTO but the outlet pipe was 1.75" dia. The list shows P/8 cars used the smaller pipe. Anyone need resonators for a full size?
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Old 09-21-2022, 08:25 AM
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Resonators were standard issue on almost all full-size Pontiacs in that era. Many A bodies had them too but it varied by year, trans and engines (68 tuning pipes for example) and typically only on dual exhaust. Even first gen Firebirds had resonators when equipped with dual exhaust (although in that case they are ahead of the muffler).

Back to full-size cars there were several versions in the 65-70 generation: wagons had a unique set up with the resonators being mounted diagonally on the axle crossover, the long wheelbase cars have longer resonators than the standard wheelbase cars. There were a few different diameter tailpipes associated to them; single exhaust and HO cars typically had 2.25” and non HO cars had either 2” or in some cases 1.75”.

69 GP’s had them except with 428 HO, 69 GTO and LeMans-Tempest had them except for manual trans GTO and single exhaust

My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - TA Hardtop)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
Old 10-04-2022, 06:39 PM
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Default Factory Resonators - Tempest Series

All 1966 (automatic and manual transmission) GTO’s came with resonators.

All 1967 automatic GTO’s came with the resonators.
Manual shift ‘67 GTO did not come with the resonators.

1) 65 GTO Survivor. 43,440 Original Miles. “Factory” Mayfair Maize Paint with Black Pinstripe, Black Cordova Top, Black Interior, OEM Numbers Matching Powertrain. Purchased from the Lady that bought it new. Baltimore Built (11A).
2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
Old 12-17-2022, 08:17 PM
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compsur compsur is offline
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P & T with resonators are a must have in any restoration. Over the years...I kept purchasing them, but the wrong ones!! .... now have 2x 9798281, 1 x 9797127 which fit 52/66 but need ones for 62's. Also have 5 x 9784753 that I have no idea what model they fit to. If your interested in any let me know.

1967 Bonneville Sport Coupe (Plum Mist), Org. paint, Org. 38K miles
1967 Bonneville Convertible (Montego Cream, Cal Car, 105K miles
1967 Executive Wagon (Plum Mist), Org. paint, Org 35K miles
1981 Bonneville Brougham Coupe (Black) Moonroof, Org. 11K miles

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