Reply to "4 x Weber 48 IDF (not IDA) conversion"

Maybe everyone is tired of hearing from me on the subject but if a 48IDA gets restrictive on a 351 what will happen with a 44 or 40 IDAnything?

A single plenum manifold for this engine would only need something like 800cfm. That's what the engine can use.

Four 2v Webers are around 2000 to 2400cfm. They lend themselves to IR, not single plenum design.

Apparently only the Australians know how the IDF's run on a Cleveland and apparently thier knowledge is largely 2v, not 4v.

My feeling is that you don't restrict an engine to increas the intake velocity.

The Australians haven't reivented the wheel. They just copied the work that Ford did on thier aluminum high port heads and refined it a bit.

As far as what the new improved IDA is, they have added a third transition hole to the carb.
It can be done to an existing carb.

What it does is theoretically eliminated the flat spot in the rpm range in the 2800 tp 3000 rpm area.

Some people say it is effective. I don't see the diffeence. Some days the flat spot is there, other days it is not.