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Cross-Country
Joined: Feb 2023
Posts: 60
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From: plains of SD
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Glad I found this forum - I am currently working on a 1978 f150 and look forward to riding the river with like-minded people ! 
I am hoping someone here can help me with this. I have been playing with the carburetor on my bone stock 1978 f150 Custom with a 351m engine. It is a motorcraft 2150 tag #D7TE-AYA and I was wondering how to find out if the booster is original to the carb. On the bottom of the booster is stamped a large L and then a smaller M2 next to it. I ask because I found an exact copy of this carb (another d7teaya) on ebay so bought it for spare parts, and lo and behold it has a different booster in it, this one has a large A and next to it a smaller 3Y. I can tell looking this booster has smaller air bleed holes on top than the other. Am curious which one is supposed to go with this carb - obviously one of them was swapped. It might make tuning a little easier. Any help would be appreciated !
I am hoping someone here can help me with this. I have been playing with the carburetor on my bone stock 1978 f150 Custom with a 351m engine. It is a motorcraft 2150 tag #D7TE-AYA and I was wondering how to find out if the booster is original to the carb. On the bottom of the booster is stamped a large L and then a smaller M2 next to it. I ask because I found an exact copy of this carb (another d7teaya) on ebay so bought it for spare parts, and lo and behold it has a different booster in it, this one has a large A and next to it a smaller 3Y. I can tell looking this booster has smaller air bleed holes on top than the other. Am curious which one is supposed to go with this carb - obviously one of them was swapped. It might make tuning a little easier. Any help would be appreciated !
Last edited by elbow grease; Feb 18, 2023 at 08:24 PM. Reason: decided to add more info.
Cargo Master
Joined: Nov 2007
Posts: 2,238
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IDK how to tell what's original, but If you don't know the full history, I'd assume at least one of had been rebuilt at some point. There aren't too many 40+ year old, all original carbs that are still running well.
Just cause the boosters look different and have different markings doesn't mean it isn't designed to work. If one is from a rebuild kit, It could even be an "improved" design to overcome flaws in the original design. Smaller air bleeds could mean a slightly bigger squirt of fuel, which really isn't a bad thing. It could make the transition from idle/low throttle to mid/ high throttle smoother.
Just cause the boosters look different and have different markings doesn't mean it isn't designed to work. If one is from a rebuild kit, It could even be an "improved" design to overcome flaws in the original design. Smaller air bleeds could mean a slightly bigger squirt of fuel, which really isn't a bad thing. It could make the transition from idle/low throttle to mid/ high throttle smoother.
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Wildpat01
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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