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I have this exact same problem, and it started as soon as the winter blend gas went away.
the RVP of winter blend gasoline is higher that that of summer to aid in vaporization, winter blend would be much more likely to have vapor locking and boiling problems.
just curious how many if any of the guys having these types of problems are running some type of insulator under the carb?
I have a 1" wood spacer under the carb.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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