Wow, what an extremely impressive engine. 113 horsepower per litre at only 6700rpm. For a two valve engine designed in the sixties this is phenomenal.
It is interesting to compare some other 2 valve engines from race and rally cars of the same era.
Lancia Stratos - 107hp/l @7800rpm (Group 4 rally car)
Porsche 911sc - 96hp/l @7600rpm (Group 4 rally car)
Ferrari 308gtb - 103hp/l @8000rpm (Group 4 rally car)
Datsun 160J - 95hp/l @7600rpm (Group 4 rally car)
Repco Brabham 740 - 115hp/l @8200rpm (1967 F1 engine)
Outperforming the nissan works team by nearly 20hp/l at almost 1000 revs less...
