Normally twin cams are used with 4-valve heads, 2 Intake & 2 Exhaust valves per cylinder. This allows for much smaller valves, springs & retainers which means much lighter valvetrain that is more stable at Hi RPMs = Higher RPM capability.
KoTT said:what is the difference? why would you want two camshafts in a car?
you mena like a Ford mod motor? Or the Northstar?sqzbox said:Can you imagine the lobe count on a 4 valve system V-engine? I think it would br virtualy imposible. One thing about overhead cams though, They eliminate valve lifters and are quick to change.