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#1
08-19-2021, 04:45 PM
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Carburetor Bolt HELP!
I lost the mounting bolts to my 1977 Rochester Quadrajet carburetor, bolting onto a 77 Pontiac engine. I know there are two lengths. Does anyone know the dimensions, hardness, of these 4 bolts? Were there washers? Any help would be greatly appreciated. Thanks
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#2
08-20-2021, 06:06 AM
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5/16" - 18 x 1-1/8" long
5/16" - 18 x 3-3/4" long |
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#3
08-20-2021, 10:03 AM
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To add to the above information, no washers on the bolts. Number 2 hardness should be plenty sufficient, although I think GM used 5 hardness, which is overkill. The bolts only need to pull the gasket snug to seal the gasket surfaces, they're not holding the engine in the car. Many people have a tendency to overtighten Q Jet bolts.
Choke up on the wrench handle you use to tighten them because overtightening just deforms the top body of the Q jet. Tighten in a crisscross sequence instead of doing front to rear sequence. That's all I have to add, hope it helps..... 
__________________
Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#4
08-21-2021, 07:51 AM
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Hey, Thanks so much for the information. You guys are the best. Respectfully P
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