>The issue that Mr. Berg is worried about is the ability to >over-rev and "float" single springs when you install dual carbs. >"Floating" refers to a condition in which a engine is turning such >high RPM that the spring tension provided by a single spring is unable >to completely close and seat the valves in the head. Keep the revs >reasonable (under 5000 rpm) and you should never experience >"floating". > My Haynes book states that the 1600 dual port engine has a rev limit of 4400 rpm and that 65 mph is the top speed. Under these conditions you could use HD singles, but I have NEVER been able to hold to these limits in a bus. Certainly not on California/west coast roads with a loaded bus. I float dual spring valves, or at least have broken them. Maybe I have a personal problem? :) I don't think you can sense valve float as readily as Mr. Carrington believes. What is the rev limit on a dual spring type IV? Sincerely, Eugene '71
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