Hello all,
Need some advice on a new carb replacement for a 1972 Mach 1 CJ. I tried Edelbrock, but their spreadbore dimensions were not correct for my stock manifold. Any suggestions?
Thanks,
ceswert

 

I don't think anyone makes an aftermarket spreadbore carb. So, you can put an
squarebore adaptor plate on, which will raise the carb about 1". I got one on my stock manifold (351C 4v) with an Edelbrock carb, works quite well, MUCH better than the stock Autolite.

Other options are to get a new intake manifold or rebuild the Autolite.

 

Thanks for the good info!

 

No one makes an after market spread bore? SPREAD BORE is actually a trade name that was copyrighted by Holley. I was never a huge fan of the Quadra Junk or it's Holley replacement the "Spread Bore," so I don't know if Holley still makes it or not. I would be surprised if they don't.

Carter made their version called a ThermoQuad. I don't know if they are still available or not.

A little googling on these terms should term up all kinds of info though.

 

Check out Jet Performance, they offer Performance upgraded and custom modified Quadrajet Carbs. Here is a link: http://www.jetchip.com/JET_Carburetors.asp

 

Carter was bought by Edelbrock.
From what I've read on the web, the new Edelbrocks are great carbs right out of the box, so I went with their Performer. I couldn't be happier with it, much more power and drivablity over the rebuilt Autolite, like night and day. It's like a poor man's fuel injection!

Not sure if the new Holleys are good or if they still make the SB.
My last experience with them was back in the early 80's, they're
most likly a different product now (i would hope anyway).

 

The Edelbrock performers are Square-bore, not Spread-bore like a Quadrajet. That wouldn't work for him.

 

I'm using a square bore adaptor on my spreadbore intake, and as said earlier
on this thread, it works fine.

 

yah. i think tyler just over-read this
those adaptors should work perfectly fine.

 

A few years ago you could still buy Carter carburetors while Edelbrock had been making them for a long time. I don't know if Carter is still in business and just sold the rights to the AFB or what.

I'm not really a fan of either one. There are some good features about them, but the problem with them is that the metering pistons and bores wear out. Unless Edelbrock has put in some sort of steel liner and used different material for pistons, then they are still prone to wearing out.

I thought many years ago that it would be a really good idea to line those metering piston bores with some long lasting material. At least the pistons can be easily changed if they wear out.

Unless the wear factor of those metering piston bores has been addressed, I don't consider the AFB, either Carter or Edelbrock, to be worth a bucket full of cold spit. I suppose if you were putting them on a car that you only drove to car shows and such it would be alright, but for long term use, they won't cut it.