cool carb trick?
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Junior User
Joined: Dec 2010
Posts: 77
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From: rapid city, sd
cool carb trick?
ok i just heard this from my parts guy. he was saying that i might be able to try this with my truck. since im looking for 4bbl parts and whatnot for my 84 f-250 w/ 460. since all performance stuff for the 460 was relly expensive he said i should try to find carb jets from a 2bbl BB that was in a motorhome since they should be 1000cfm jets or something like that like. and told me that you can do that with mopar. so... does anybody know if this can be done, and if so what years would i be looking for. or if any one has better info let me know. thanks
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Hey, Beast, click User CP in the upper LH corner and then fill out the rest of your profile so
we can see where you're at, would ya?
About carb jets, go to a speed shop and talk to the guys there, you'll get MUCH better
information than you will at a consumer-oriented auto parts store.
we can see where you're at, would ya?
About carb jets, go to a speed shop and talk to the guys there, you'll get MUCH better
information than you will at a consumer-oriented auto parts store.
Thread Starter
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Junior User
Joined: Dec 2010
Posts: 77
Likes: 0
From: rapid city, sd
so about what year(s) would i be able to find that 4bbl that should fit onto my 84 then? and changing the jets wouldnt give me alot but it would be better than the thing gives me now... just checking on cheap possible power boosters thats all.
Laughing Gas
Joined: Feb 2010
Posts: 781
Likes: 8
From: Sanford, NC
The jets in a carb only meter an amount of fuel into the carb airstream. From the factory
theay are calibrated to achieve a mixture that is good for drivability and economy.
Performance engines that flow a lot more air use jets that produce a richer
fuel air ratio because they run at WOT more often. Putting larger jets in the 4bbl of a
stock truck will usually only cause terrible fuel milage and very little if any improvement
in performance. If you want attempt to play with jets don't go more than 1 or 2 sizes
larger than stock and drive it awhile and measure the difference it makes.
theay are calibrated to achieve a mixture that is good for drivability and economy.
Performance engines that flow a lot more air use jets that produce a richer
fuel air ratio because they run at WOT more often. Putting larger jets in the 4bbl of a
stock truck will usually only cause terrible fuel milage and very little if any improvement
in performance. If you want attempt to play with jets don't go more than 1 or 2 sizes
larger than stock and drive it awhile and measure the difference it makes.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Holley recommends one jet size for every 2,000 feet in elevation above sea
level, Rapid City is at 3200 feet, exactly between 1 & 2 jet sizes.
Jets are cheap, you can take out your old ones (to see their sizes) and
compare to the sea level specs for your carb, then go to your local speed
shop if you wanna change 'em.
I didn't think Rapid City would *have* such a thing as a Speed Shop but
google says they do! The Speed Center at 105 N. Cambell St.
A+ Quality Metal Hood Scoops by the Speed Center
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Elder User
Joined: Apr 2009
Posts: 922
Likes: 1
From: San Diego
After thinking more on your post.
What is wrong with your current setup? Do you have an aftermarket intake? Stock intakes weigh a ton and are not as "hi flow" as aftermarket ones. Not to mention you would need a different intake for that guys idea of putting a 2bbl on a 460.
4bbl Holley's can be found on heavy duty fords (F250, F350) as well as heavy duty cargo vans and motorhomes up until 1986. Some 351W's even came with them. I have one (from a 351W) that I sourced at the jy, I am going to rebuild it and see how it works on my 400.
There are other things that should be done to a 460 before fooling with the carb. Straight up timing chain, making sure all the emissions stuff is working as advertised would be a good starting point.
Then I would go with getting a Holley 4160 for about 300 bones which is not expensive and is easier than finding a jy model and rebuilding it and tuning it for your truck.
What is wrong with your current setup? Do you have an aftermarket intake? Stock intakes weigh a ton and are not as "hi flow" as aftermarket ones. Not to mention you would need a different intake for that guys idea of putting a 2bbl on a 460.
4bbl Holley's can be found on heavy duty fords (F250, F350) as well as heavy duty cargo vans and motorhomes up until 1986. Some 351W's even came with them. I have one (from a 351W) that I sourced at the jy, I am going to rebuild it and see how it works on my 400.
There are other things that should be done to a 460 before fooling with the carb. Straight up timing chain, making sure all the emissions stuff is working as advertised would be a good starting point.
Then I would go with getting a Holley 4160 for about 300 bones which is not expensive and is easier than finding a jy model and rebuilding it and tuning it for your truck.
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Joined: Jan 2001
Posts: 56,980
Likes: 2,735
From: Virginia
If you have a factory Holley carb, stick with "Holley" jets. They have the same thread pitch and will fit, and you have many many choices for jets, since Holley is big in the aftermarket. The Mopar guys probably do jet swapping and drilling because they use a oddball stock carb where jets are not readily available. The stock Motorcraft carbs would be an example of this where jets are hard to come by.
460 hop-up parts are not expensive by the way. No more than any other engine.
460 hop-up parts are not expensive by the way. No more than any other engine.
Thread Starter
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Junior User
Joined: Dec 2010
Posts: 77
Likes: 0
From: rapid city, sd
After thinking more on your post.
What is wrong with your current setup? Do you have an aftermarket intake? Stock intakes weigh a ton and are not as "hi flow" as aftermarket ones. Not to mention you would need a different intake for that guys idea of putting a 2bbl on a 460.
4bbl Holley's can be found on heavy duty fords (F250, F350) as well as heavy duty cargo vans and motorhomes up until 1986. Some 351W's even came with them. I have one (from a 351W) that I sourced at the jy, I am going to rebuild it and see how it works on my 400.
There are other things that should be done to a 460 before fooling with the carb. Straight up timing chain, making sure all the emissions stuff is working as advertised would be a good starting point.
Then I would go with getting a Holley 4160 for about 300 bones which is not expensive and is easier than finding a jy model and rebuilding it and tuning it for your truck.
What is wrong with your current setup? Do you have an aftermarket intake? Stock intakes weigh a ton and are not as "hi flow" as aftermarket ones. Not to mention you would need a different intake for that guys idea of putting a 2bbl on a 460.
4bbl Holley's can be found on heavy duty fords (F250, F350) as well as heavy duty cargo vans and motorhomes up until 1986. Some 351W's even came with them. I have one (from a 351W) that I sourced at the jy, I am going to rebuild it and see how it works on my 400.
There are other things that should be done to a 460 before fooling with the carb. Straight up timing chain, making sure all the emissions stuff is working as advertised would be a good starting point.
Then I would go with getting a Holley 4160 for about 300 bones which is not expensive and is easier than finding a jy model and rebuilding it and tuning it for your truck.
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