Ray,
If you're using a factory 1275 cam, I have a hard time believing
that the duration is sufficient to cause a lot of 'hunting' of the carbs
at idle. It sounds simply like your interconnecting throttle linkage is
maladjusted, or you've a vaccuum leak. There is the offhand chance that the
throttle plates were installed with the beveled edges facing the wrong
direction, but I don't really know how much of an effect this would have.
I really enjoyed the wide-band improvement of my 4-cyl spit after
I went one size bigger on the SU's, and I bet you'd find the same
result. The only problem I had was that I never got the needle size /
jet adjustment setting just right. You may have to do a good amount of
fiddling to get a different carb setup to supply the expected air/fuel
ratio throughout the rpm and load range. In this respect, it's always
amazed me that people expect a simple spring/mass/damper/pneumatic
carburettor system to accurately meet the non-linear mixture needs of an
engine. I don't yet have however a simple, bolt-on, self mapping
electronic fuel injection system to sell you.
Good luck to you and the green one, for as he himself says,
"It's not easy being green"
Greg Meboe meboe@wsuaix.csc.wsu.edu
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