> 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. _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist