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EduardoG=> Can someone explain what they are, and assuming they are a
=> good thing, can they be retrofitted to a '67?
They go up between the pushrod tubes and the cylinders, replacing the
stock flat tin, to shape airflow more tightly around the bottoms of the
cylinders. I've yet to see anyone show them to be harmful, and many
report good results, so many that they are pretty much standard on
rebuilds here in Arizona. They'll fit your '67 (and any other year) just
fine. Wire them onto the cylinders after you've set the jugs and before
you put on the heads. Buy black, not chrome.
Steven Ayres, Prescott AZ
'66 KGhia 1600 (awaiting a new crank)