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

Last edited by Cab_Burge; 06/14/19 02:06 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)