I was looking into what cylinders need pairing to make a set 0f 180 headers for an LS V8 engine.
When looking the pairings shown below.
LS firing order 1-8-7-2-6-5-4-3
Passenger (L) side = 1 3 5 7. Driver side (R) 2 4 6 8
1-8-7-2-6-5-4-3
L-R-L-R-R-L-R-L
for a 4-1 header I get.
1-7-6-4...