1972 Mach 1 Carb Replacement
10-16-2008, 07:57 PM
#1
1st Gear Member
Thread Starter
Join Date: May 2007
Location: CA
Posts: 69
1972 Mach 1 Carb Replacement
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
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
10-17-2008, 12:04 AM
#2
2nd Gear Member
Join Date: Sep 2008
Location: The garage (near SF bay- Calif)
Posts: 469
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.
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.
10-17-2008, 08:41 AM
#4
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Join Date: Aug 2006
Location: North East Texas on the Red River
Posts: 886
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.
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.
10-17-2008, 08:45 AM
#5
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Join Date: Mar 2006
Location: Apison, TN
Posts: 971
Check out Jet Performance, they offer Performance upgraded and custom modified Quadrajet Carbs. Here is a link: http://www.jetchip.com/JET_Carburetors.asp
10-17-2008, 09:06 AM
#6
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Join Date: Sep 2008
Location: The garage (near SF bay- Calif)
Posts: 469
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).
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).
Last edited by 1971mach1; 10-17-2008 at 09:19 AM.
10-18-2008, 01:25 AM
#8
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Posts: 469
10-22-2008, 06:03 AM
#10
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Join Date: Aug 2006
Location: North East Texas on the Red River
Posts: 886
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.
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.