[68gt500]

@Sizzler

The motor is a PI so it had the small valves. Since the chambers were about the same size (don´t recall exactly about 72-73 cc) I didn´t change anything else.
Even the rocker arm alignment was ok, so no shims were needed.

I kind of expected more power by going fom the small 2.03/1.56 to 2.09/1.66 sized valves. But power wasn´t really the issue.