Cross Plane 180 headers for GM LS V8

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SUMMARY

This discussion focuses on the optimal pairing of cylinders for creating 180-degree headers for GM LS V8 engines. The LS firing order is 1-8-7-2-6-5-4-3, with the left side (passenger) consisting of cylinders 1, 3, 5, and 7, and the right side (driver) consisting of cylinders 2, 4, 6, and 8. The proposed configurations include a 4-1 header arrangement of 1-7-6-4 and 8-2-5-3, as well as a 4-2-1 setup. The discussion raises questions about the effectiveness of these pairings in terms of resonance scavenging and the resulting exhaust note.

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ninjasta
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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
8-2-5-3
AND for 4-2-1 180 - Was thinking the 1st pair would be short headers.
1-7
y-pipe > Left Out
6-4

8-2
y-pipe > Right Out
5-3

However I noticed that if I just paired the cylinder ports (inner,outer) as follows I can 4 * 180 pairs as follows
180 pairs into 4 pipes (Twin * 4)
1-7 > out A/L
5-3 > out A/R
6-4 > out B/R
8-2 > out B/L
My question would the above arrangement still take advantage of resonance scavenging whilst avoiding the need for headers which link pair from opposite sides at expense of running 4 separate outlets at the rear (I quite like the idea of 4 outlets).
What effect would it have on the exhaust note - would sound like 180 headers or some thing different from either a crossplane or flat-plane v8?
 
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The biggest issue is where the header collectors will fit and still leave you with optimum length and non-pinched turns.
 

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