Roger, both
the VR1 Conventional and Synthetic 20W-50 Racing Oils are perfectly acceptable
for classic car with flat tappet cams to use from spring through fall
months.
If
you have any additional questions please feel free to reply to this email.
Thank
you once again for contacting Valvoline.
Dave
Valvoline
Product Support
Thank you,
Valvoline Product Support
Ticket Number:
11-386003