[Barry_R]

Single plane 4150 flange

A/F was monitored in both cases via the O2 sensors in the exhaust.

Timing was identical - the FAST system was still plugged in and running ignition and some data could still be retrieved to back up the dyno - obviously not fuel.

The Weber deal would indeed be different. Most if not all carbed Weber deals suffer from inadequate airflow - no shared volume from the non-existant plenum. Ford's abbreviated Boss 302 IR effort used two Dominators. Anything that adds airflow in an IR package will show a gain - but the gain is because of the additional air and not the management system.