Quote:
Originally posted by Eric Parham:
Bill, not to confuse the issue, but I believe that the 4-cyl ALFAs truly are DOHC. DOHC is not defined by the number of valves, but rather by the number of cams operating any valve for a given cylinder. That is, if one cam operates the only intake valve, but a different cam operates the only exhaust valve in that same cylinder, then it truly is a DOHC irrespective of only 2 valves per cyl.
The differentiation between SOHC and DOHC becomes very important in IT (where only stock spec cams are permitted), since various tolerances can be used to advantge in most DOHC cases to obtain better valve overlap, which is not possible with a SOHC.