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Let's just say that most people would have been perfectly happy with the original outcomes... Just not me. I can tell the difference in cars that I work on while other car guys swear everything's flawless all along.
Mmm...no, let's not just say that, for it's not so. To be blunt, you are not the only one who knows/cares enough to detect the difference between an engine that runs acceptably and one that runs perfectly. And, I daresay you're very likely not the most exacting and picky on this board. So let's please take a couple of steps back from this "I'm right and the rest of the world just doesn't care enough to know better" kind of attitude here, thanks.
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I didn't find that the needle lift ramp related to year, not engine.
OK, well...never stop learning, eh!
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The mechanical-lift/tin-top BBDs were officially called "solid fuel" BBDs, and were phased in for 1977 on
all BBD applications, slant-6 and V8. The previous design is known as the "air bleed" BBD.
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And no, my experience is NOT limited to just the one super six that I owned. I used to have a big boxful of carbs, owned and worked on an array of 318's for others, too.
OK, fair enough. Maybe the particular V8 carburetors you had access to didn't work well on the particular slant-6s you were working with. Or maybe you were running low on carburetor mojo. Or maybe the stars weren't lined up in your favour. I don't aim to turn this into a pickiness pissing contest, but you are conversing with someone who has on more than one occasion removed utterly, perfectly good starter motors because he preferred the way a differently-built example of the same type of starter motor
sounded while cranking the engine. With that in mind, are you
really confident saying I'm insufficiently picky and observant to mean it when I say I've put 273 and 318 carburetors with very minimal mods on 225s and had them run as perfectly as a carbureted slant-6 can run...?
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the reading materials I used to have on the carbs and their tuning instructions. They lead me to these conclusions...
Yep, once they started putting BBDs on 225s in North America in '76, the factory literature was very specific about not swapping 225 and 318 versions of the BBD because of different calibration, venturi size, and air horn/choke plate size. But just a few years prior, factory info (Direct Connection slant-6 info bulletin) specifically
recommended installing the BBD from a 273 or 318 on the slant-6 for a power boost. What made the difference? Federal exhaust emission certification regulations were very much more comprehensive in 1976 than they were in 1966 or 1970. By 1976, emisssion control warranty legislation was on the books, making the automaker responsible for the emissions compliance of a vehicle for a long period of time and miles after its construction. The regulations are written such that the automaker can be held legally responsible and heavily fined for modifying
or endorsing the modification of a roadgoing vehicle in any manner that could potentially cause it not to comply with the emissions requirements under which it was Federally certified.
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Too many people who were born on third base actually believe they've hit a triple.
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