Altissimo right light on sfc fairing.

[Paul Marx]

Looks like a stteper inlet angle than std small valve heads - for 1971 perhaps it was the precursor to the big valve heads that went onto the SF1 in 1973?

As Marnix writes, all SFCs were big valve. That's where the SF1,2,3 came from.
Paul

 

[CLEMTOG]

start counting fins first, head and block!
CLEM

 

[MarnixSFC]

Oh, I see already a 1971 Bol replica arising!
Ciao, Gert

Replica? Dreaming not forbidden..

Marnix