Hi Everyone, So I was giving this some thought today just for fun and I thought I would ask the experts if the following is possible and if so, would it do anything? What if one were to put a set of 4 valve heads/cams from a 308 QV engine on a 2 valve carbed engine, resulting in a carbed engine with 4 valves? I'm thinking that the improved flow with the right jetting would produce a chunk more horsepower. Is this possible? Will the heads fit? (I have no idea where you could get the heads or how much they would cost, but...) Birdman
Or you could just put carbs on a QV motor. My experience shows that if you want 4 valves per, then it is best to just get a whole motor.
The answers are No, No, No, and No. The QV heads won't fit, as the stud patterns are a bit different. And, carbs won't fit against the QV head w/o a custom manifold. Check the archives, as someone made a manifold to adapt carbs to the later heads.
Modena Engineering(Frank Capo) made carb manifolds for 3.0 and 3.2 qv engines. Most were used to adapt the TWM FI Throttle bodies (see ric rainbolt's page for pictures). I have a set of 40 DCNFs on my 3.2 qv - conversion documented in this and old board, now in 6 parts. Fchatter Paul Sloan is putting IDFs on a 308 qv now. Conversion from Kjet to Webers very popular with 2.7 - 3.0 911s. I think there is a qv in Oz with Webers, but only third hand. hth! best rt