Originally Posted by JavaJeep
I need some advice on building some headers for the 258 cu in straight 6cyl in my 1980 Jeep J20
The firing order is 1-5-3-6-2-4
I want to group the headers into a 3 into 1 system , the question is do I group cyls 1 to 3 and 4 to 6 or group using the firing order or what ?
I think you want the exhaust pulses to be evenly spaced in each group, so two groups, every other pulse would be 1-3-2 and 5-6-4; that's 1-3 and 4-6, like you said.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D