460 Carb Question
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Senior User
Joined: Jan 2003
Posts: 192
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From: Gilbert, Arizona (Phoenix
460 Carb Question
I have a 76 F150 2wd with a 460 and automatic. When I purchased it a couple of weeks ago, it had a Holley double pumper carb installed. I'm sure that's not from the factory. However, it had 2 spacers underneath the carb. I'm wondering if that is correct or did the person that put the carb on (don't know who that is) add the extra spacer for some reason related to the double pumper.
This beast sure needs a lot of gas. I've got a 600 CFM Holley with vacuum secondaries on there now, but have already experienced vapor lock once. Considering going back to the Double Pumper, but wanted to know if I should put the 2 spacers back under the carb, or just go with one? Any suggestions?
This beast sure needs a lot of gas. I've got a 600 CFM Holley with vacuum secondaries on there now, but have already experienced vapor lock once. Considering going back to the Double Pumper, but wanted to know if I should put the 2 spacers back under the carb, or just go with one? Any suggestions?
Elder User
Joined: Feb 2003
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From: Boise, ID
460 Carb Question
I suppose it's possible that the two spacers were on there to help prevent vapor lock. The only other reason I can think of for putting on two spacers (aside from performance enhancement) would be to gain clearance for the accelerator pump housings. If it has 50cc pumps on it then sometimes you have clearance problems on the intake.
How thick are the spacers? Are they alumnium or plastic?
One more reason I just thought of for having the two spacers would be if one of the spacers didn't have holes big enough for the throttle plates.
How thick are the spacers? Are they alumnium or plastic?
One more reason I just thought of for having the two spacers would be if one of the spacers didn't have holes big enough for the throttle plates.
Posting Guru
Joined: Jul 2002
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From: Paola, KS
460 Carb Question
My dads 76 f-250 has a spreadbore manifold on it and the stock motorcraft spreadbore carb, so it could be that the bottom spacer is actually an adapter to bolt the square-bore carb to the spreadbore manifold.
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Senior User
Joined: Jan 2003
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From: Gilbert, Arizona (Phoenix
460 Carb Question
I'm starting to believe that the reason for the 2 spacers was to accomodate the Holley. If my research is correct, this Holley was designed for a GM product. One of the spacers looks like it is an adapter to line up the bores on the bottom of the carb to match my stock intake. Thats why I want to find out the right carb. According to Brian460, sounds like it was a Motorcraft. Any idea what model I should be looking for?
Posting Guru
Joined: Jul 2002
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From: Paola, KS
460 Carb Question
I can find out what model it is and post in a couple of days if needed. Although I would reccommend keeping the adapter and just using an Edelbrock 600cfm carb. The Motorcraft spreadbore are not all that great.
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Senior User
Joined: Jan 2003
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From: Gilbert, Arizona (Phoenix
460 Carb Question
I've heard good things about Carter carbs - are they similar to the Edlebrocks? One old-timer mechanic said the motorcraft may not be as good a performing carb, but if I just want something to install and then never have to bother with it again - go with the stock motorcraft. He said if I wanted something to improve performance, go with a carter as they work well and are easy to work on if you want to make changes.
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Senior User
Joined: Jan 2003
Posts: 192
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From: Gilbert, Arizona (Phoenix
460 Carb Question
I picked up a used 625 CFM Carter AFB today. It has GM linkage, which I believe means it doesn't have the kickdown lever. I'm hoping I can buy the missing linkage or fab something myself. I'll try it out tomorrow.
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Joined: Jul 2002
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From: Paola, KS
460 Carb Question
You will need the Ford and Chrysler throttle lever adapter #1483 and possibly the throttle cable kit #1495 use this link to look
<http://www.edelbrock.com/automotive/index.html>
<http://www.edelbrock.com/automotive/index.html>