Not everyone is a machinist or has a Bridgeport mill.... just saying.
True! I don't have a Bridgeport, and while I do have both a couple of mills and several lathes, non have CNC controls.
And I am a "machinist by necessity".
I sublet quite a bit of machine work. Try to weigh my skills and my time required against the cost of a professional machine shop. Just ordered today 25 brass fittings for a French Stromberg (3 used per engine) on a racing Talbot-Lago. The machinist will make 25 at $10. each. I can make 1 in about 3 hours. So 3 come to 9 hours of my time that can be spent much more productively.
Sometimes, it might be best to find a good machine shop, and have the work done professionally.
I don't agree 100 percent with Jerry that it is all eye-candy (maybe 95 percent
)
GUESSING that if an enthusiast would dyno their two carb setup against a well-functioning single carb optimized for the engine (not a Rochester B), they would find they actually LOSE performance. If done right, with a really good calibration, and synchronization, possible to gain 5~8 percent. Anyone gaining 10 percent should start looking for a job as a carburetor specialist for one of the race teams in a series that still uses carburetors.
What generally happens, is the enthusiast compares their new 2 carb set up against their worn-out Rochester and the new set up is much improved.
The above is why I am 95 percent in agreement with Jerry; gains ARE possible, but unlikely against a good single carb.
BUT, if the set up IS going to be eye candy:
To me (everyone has their own standards), slotting the carburetor throttle body (as some do), or using an adapter just screams "rat rod", NOT eye candy. Machine work on the manifold, while maybe not within the realm of the average enthusiast, gives a much more eye-pleasing set up.
But if one DOES wish to use adapters, the method I presented in my first post is an inexpensive way to do so. The old cast iron adapters are difficult to find, and quite expensive. The newer cast stuff, made out of some metal that I don't recognize, and am unable to machine (it crumbles) in my opinion should be avoided.
And for those that do want performance to go along with the eye candy, consider three carbs; OR design and fabricate a different cylinder head with a different port arrangement, set up for 2 carbs.
Jon.
