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03-06-2021, 08:12 PM
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#1 |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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Rochester Quadrajet bolt hole size
Does anyone know the size of the bolt that will fit in these holes? I tried the bolts that I have and none of them fit.
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03-06-2021, 08:41 PM
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#2 |
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Senior Member
 
Join Date: Dec 2009
Location: TN.
Posts: 8,408
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Re: Rochester Quadrajet bolt hole size
What's the number on your carb?
The older carbs I think that was #10 x 32 threads? I can check tommorrow. If it a late model it has metric threads. .
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build Last edited by Getter-Done; 03-06-2021 at 08:49 PM. |
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03-06-2021, 09:14 PM
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#3 |
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Registered User
Join Date: Nov 2013
Location: Antioch, Ca.
Posts: 457
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Re: Rochester Quadrajet bolt hole size
Well I went out and grabbed the screw that goes in those holes and it's 12-28 UNF. They are c'sunk oval head screws. I even took a pic of the screw but I can't get it to upload.
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Take Care Troy |
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03-06-2021, 09:35 PM
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#4 |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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Re: Rochester Quadrajet bolt hole size
17080507
2801 DNR What is UNF? Don’t worry about the photos |
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03-06-2021, 09:38 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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Re: Rochester Quadrajet bolt hole size
Thank you guys
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03-06-2021, 11:18 PM
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#6 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 8,408
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Re: Rochester Quadrajet bolt hole size
17080507
170 means 1976 and later. 4th digit (8) means {in the 80's} 5th digit means (0) 1980 6th digit is Califorina only 7th digit is Chevrolet 8th digit is an odd number example (1,3,5,7,9) so it's a manuel trans. Link: https://www.chevyhardcore.com/tech-s...ication-guide/ (UNF stands for Unified Fine Thread) Link to threads : https://journeymans-workshop.uk/unified.php .
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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03-07-2021, 12:28 AM
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#7 |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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Re: Rochester Quadrajet bolt hole size
So does 1976 and later mean it is a late model? So does that mean it is metric?
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03-07-2021, 12:34 AM
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#8 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 8,408
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Re: Rochester Quadrajet bolt hole size
I don't know for sure.
Your's looks like it would be standard screws. The ones that are metric have those torxs screws , But I would check the other screws with a thread pitch gage. Or with a standard screw just to be sure. .
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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