351 cam in a 302?
#7
#9
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
1-5-4-2-6-3-7-8
and here's the 351
1-3-7-2-6-5-4-8
you see the 1st, 4th, 5th and 8th cylinder fired are the same
1-x-x-2-6-x-x-8
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.