Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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so, if the 351 firing order is better, can you put a 351w cam in a 289/302 and just run the 351 firing order?
as what 69RunningHorse says.
here's the theory
you have four cycles: intake, compression, work and exhaust.
through those cycles the camshaft only turns once, but the crankshaft twice.
so the piston is fully up when engine ignites but again when it just pushed out the burned mixture through exhaust valve.
When you fire is regulated by firing order. the valves are regulated by the camshaft.
here's the 289 firing order
and here's the 351
you see the 1st, 4th, 5th and 8th cylinder fired are the same
and the 5-4 and 3-7 order is just interchanged.
No change on crankshaft, just the valve opening is turned at 180 degrees on cam on those 4 cylinders. firing order changed, job done.
302ci, Edelbrock RPM heads, xe268h, 650 speed demon, Hooker Long Tube headers and Flowmaster 40s
Quick Performance Racing 9" rear, Moser axles, 3.5:1 trac-loc from FRPP and T5 transmission.
CSRP disc brakes front and FRPP discs back. http://www.gascc.ie
yeah the main benefit is not having the 1-5 part of the firing order as it stresses the front of the crank (or so i've heard). since the blocks are weak where the main caps screw into them its wise to not have two power strokes on the same journal 1 after the other. (in theory)
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