Originally Posted by Cab_Burge
I've spent hours writing down different firing orders based on which two pistons are at TDC at the same time, when you do the 4/7 swap all you have accomplished is to move the problem from the driver side rear block to the front passenger side of the block, correct work
1843
6572 Standard Mopar V8 and early Chevy V8 firing order.
The 7-4 swap =1873
6542 shruggy
if you change it to:
1543
6872 you then change the two cylinders firing in line from each other to the passenger side two rear cylinders, correct work scope whiney
I'm done for tonight on this but a custom built crankshaft could remedy the issues, correct devil whistling


It's not so much that you are moving 5 and 7 from firing next to each other. It's better to have 2 and 4 fire next to each other, as the cooling of the front cylinders is better. Again, that is about the least of why it's done.

Changing the FO moves the firing pulses and the engine should be noticeably smoother. The 4 cylinder swap firing order AFAIK came on early Cadillacs and they are butter smooth.

IIRC there are 8 possible firing orders for a V8. The 4 cylinder swap is the best but it's damn hard to get cam cores for a Chrysler with that swap.

Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston