The single carb tunnel ram may not be the best performer, but it is doubtful that this is the sole reason that your engine will not run under 3000 rpm.
You did say that you changed to this manifold and tried both a 750 carb and the 850 demon, and this 750 carb worked on the first manifold.
So, since you changed intakes; I would go back and double check that you got your ignition timing back where it was before, and check the intake manifold for vacuum leaks.
Brian
I had a single carb tunnel ram on an old boat and seem to remember that it had a couple of large plugs in the plenum. Just want to make sure that you don't have some huge vacuum leak somewhere.
Brian
Posting Permissions
Reply With Quote