Merge collectors

[Billy Nees]

Originally Posted by Darrin Christen

Interesting read. What would be the tell tale signs that a engine may be over scavenging? Anything noticeable in the tune up that would be an indicator of this condition?

Pretty much an over-simplification but the car won't be responsive to timing or jet changes.
If the combo can handle it, open up the exhaust lash and make a run.