Quote:
Originally Posted by micondie
I have used cam timing bushings on small block chevy's. The range of adjustment is usually +-5 degrees. Any more than that will run the risk of piston/valve interference. I am unfamiliar with the Ford but if it has a pin to locate the cam gear this is a simple mod. If it has a keyway you could try an offset key. I don't know if these are available but they shouldn't be too hard to machine.. I have been thinking of trying a cam advance on my van since I think that lowering the torque curve would lower the required throttle opening for equivalent acceleration and reduce fuel consumption. As for changing the rockers, I remember reading about someone just changing either the intake or the exhaust rockers but I can't remember the reasoning behind it but I think that this would be worth some further research. The rocker change would increase the lift but NOT the duration which is what you would want for increased torque.
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Changing rockers will increase open duration on the valve, as well as lift.
Comp lists valve opening and duration for 1.5, 1.6, and 1.7 rockers for their cams, each number shows progressive increases.
Clearly, it won't affect the cam's duration, but it does effect the number of degrees that the valve is open/closed.
I can't remember ATM if it has a pin or a key, but, IIRC, it's interference fit w/ the cam shaft. I believe someone makes adjustable cam gears for them, though.
Unfortunately, since there is no chain, there is no way to change gear sizes to use gears from some other application, either, without retrofitting a chain tensioner and a better oiling system for it.
PS - The gears are made of fiber. Thank you, Ford.
