> > And then there are the exceptions like an aftermarket cam in Ford
> > 351 Windsor will change the firing order.
> Is that right? - surely a different crank (eg: a flat plane crank)
> would change the firing order, but an aftermarket cam can only change
> the valve timing.

When the marker on the crank says TDC, you have a situation where 
there are 2 pistons at the top of the stroke, 2 at the bottom, 2 coming up 
and 2 going down as dictated by the crank.
A piston at the top could either be firing or finishing the exhaust stroke. 
A piston going down could be either on the intake stroke or the power 
stroke. It is the cam that determines which is intake and which is power.
Then you get the boat guys who change the cam to make the motor run 
backwards. 

Steve.
 


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