Rebuild or buy a remanufactured Q Jet

I have a Q-Jet on the 455 I imported into the UK.

The question is do I rebuild it or buy a remanufactured unit such as this

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HLY%2D64%2D7035&N=700+4294908256+4294840139+4294890854+4294925239+4294839063+115&autoview=sku

 

rebuild it. Unless your missing parts or the throttle shaft is worn out. Much more cost effective to rebuild, and it is probably an 800cfm on your 455 already.

 

Mark, Hi

Thanks for that.

I didn't realise rebuild kits were so easy to get hold of or so cheap as well.

Found this website http://www.carburetor.ca/carbs/kits/CK066.htm which lists a rebuild kit for my Q-Jet (7044240) at $33.11

If anyone has any tips or advice for how to rebuild and then set up the carb I'm all ears.....well not literally as I do have only two....even though I'm English :TU:

Just found they do a Superkit which makes sense for me as I need to get this right first time. http://www.carburetor.ca/carbs/HTML/SuperKits/index.html

 

According to the info I have the carb must have been replaced on this engine at some time. The engine is a '70 and the carb is a 74 off of a Buick Century 455.

Is there a way of telling if this is a 750cfm or an 800cfm carb?

Cheers

Allan

 

All carbs built after 72- 73 are 850 CFM's. You might want to check this website for kits. www.thecarburetorshop.com

There are plenty of articles on the internet to help you rebuild or modify your Q-jet. Let Google be your friend in need. There's a really good Oldsmobile website that has a great FAQ section. There are also some good books on the Q-jet; I'd recommend the ones by Doug Roe or Cliff Ruggles. See if you can find one of them.

Ed

 

Ed

Thanks for the information, it's appreciated.

I found this website which I'm sure you will know about. Quadrajet

I know many people don't like the Quadrajet due to the belief that it's difficult to set up but from what I've read it is the perfect carb. So I'm sticking with it and will eventually get to grips with it

 

You have tons of info available. I bought my Q-jet parts from Greg Gessler's web site. He is here on this board and has a lot of parts available.

When you get your kit, it will have step by step instructions. Just read and follow them closely. Setting your float level is critical, so watch that.

good luck.

 

Thanks, I'll send Greg a PM today and see what he has.

 

All 455 Q jets were 800 cfm except for the 1970 model year where they were 750 cfm.

 

ooooooooooo..... now my brain is aching.

Cheers Flyn

 

For a street build there will not be much, if any, difference given the same set up with rods etc. Most, if not all, 350 Buicks were 750 CFM -- Qjets too. (I am unsure about the late 70s up until the 81 model year when they ceased production.)

 

All Rochester carbs when rebuilt should have the base plate re-bushed. You can buy the kit and do it yourself but someone who knows what they are doing would be better. This is the single biggest problem with a Qjet. When fixed it is better than new and will never where out but many guys who rebuild a carb still have problems this is why. They did not do it. You also need to put epoxy on well plugs as they often leak.

 

I used the rebushing kit from tin indian performance to rebush my 68 Quadrajet for a 350. I had great results. FYI