4.2L headers vs. manifold
Has anyone swapped the 4.2L exhaust manifold for a header? What kind of power increase if any was experienced. I have been told that there is no emissions legal header for the 4.2L but so far have not been able to confirm that. If anyone can help it is appreciated.
'85 CJ-7 - 258 bored .030 w/ mid level cam, 4.0 head, Clifford intake and header, Weber 38, TFI w/ MSD 6, Black Diamond 3" lift, Daystar 1/2" lift shackles, 33x12.5 Goodyear Duratracs with stock 3.31 gears.