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Author Topic: Carb kit question  (Read 3000 times)

Offline Hulkjoegan

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Carb kit question
« on: September 01, 2017, 11:38:20 am »
I'm planning on rebuilding my quadrajet on my 454, how do I find what rebuild kit I need? There's so many out there and I don't know if there's a difference between years. The casting numbers are 17085212 1685 HPA

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1985 Suburban C20 Scottsdale "Bonnie the 'burb"
454 Quadrajet TH400

Offline VileZambonie

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Re: Carb kit question
« Reply #1 on: September 01, 2017, 04:25:51 pm »
You go by the casting number
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Hulkjoegan

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Re: Carb kit question
« Reply #2 on: September 01, 2017, 04:52:13 pm »
regular part stores don't make it too easy to find a specific rebuild kit on their websites. I found one on a specialist website that had all the casting numbers listed. Thanks anyway
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1985 Suburban C20 Scottsdale "Bonnie the 'burb"
454 Quadrajet TH400

Offline blazer74

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Re: Carb kit question
« Reply #3 on: September 01, 2017, 09:52:39 pm »
Problem with some kits they are cheap and rubber parts don't hold up to ethanol. They need to be made of Viton or they will swell up.

I personally use cliffs high performance online for my q jet parts and kits. You can also call and order.
Costs more but worth it imho.

He also has a forum for questions regarding the Q jet. He does like to know that you used his kit when giving advice.

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Offline Henry

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Re: Carb kit question
« Reply #4 on: September 02, 2017, 11:21:11 am »
Hi Hulk:
Sounds like you have the original Rochester M4M series Q-jet for your truck by your casting number. It could be either a M4M, M4ME, or M4MC. The guys at quadrajetparts.com should be able to get you what you need as far as a rebuild kit and whatever other little parts end up needing replacement.
Regards,
Henry
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