I have a 2bbl carb on my 2.8 in my pinto. The tag on the carb reads d7ye-aa. Looking at Rockauto I find listings for several carb kits. One has the same d7ya-aa as my carb. Another carb kit has d7ye-ba. My local parts has the d7ye-ba in stock and can't get the -aa. What would the difference be?
@19Walt93
PS: I bought the -ba kit but haven't opened it yet.
I've seen a lot of guys get in trouble with part numbers that were close but not the same. Breaking it down, the "D" identifies the 70's, "D7" indicates 77, the "Y" I believe means the part isn't model specific- a Pinto/Mustang II part would have an "F" in the 3rd spot, an LTD would have an "A", etc. Not sure what an "A" or an "E" in the 4th spot means. A part number has 3 segments- prefix D7FZ identifies a part first used on a 77 Pinto- then the base number "9510" for example is a carb- then the suffix which identifies the individual part. On a carb kit the difference is likely calibration, maybe a richer or leaner power valve (Ford would call it an economiser valve). If you can see the gaskets and other parts and they look right I think you're OK using it. A Motorcraft kit that's in the ball park is apt to be closer to the correct calibration than any aftermarket kit would be.
Want some free HP and gas mileage? Recurve the centrifugal advance. My 77 Mustang 302 distributor wasn't fully advanced at 4500 rpms, getting the advance all in made a world of difference. Cars in the Jimmy Carter years didn't work any better than the economy did and we had inflation in the high teens.
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