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.
Just to confirm osburn, a buddy of mine was tearing his hair out looking for an emissions-legal header for his '81 CJ. Borla was the only fabricator that had one that would pass smog. He didn't see a lot of improvement, but that's not necessarily a good example as his Jeep ran like crap anyway...
'94 YJ Sahara Hardtop
4.0L / AX-15 / Stock NP231 / Stock D30 (open) / D60 (35-spline, Detroit locker, Moser axles) / rear disc brakes / 4.56 gears / Advanced Adapters SYE & CV Shaft / 33" BFG MT-KM's / Thorley Header / Magnaflow Muffler / BesTop Flares
|Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)|
|Thread||Thread Starter||Jeep Forums||Replies||Last Post|
|Where to buy APN headers?||pitbullguiller||Engines & Drivetrain||1||12-24-2009 08:04 AM|
|Need help for headers???????????||jeep81||Street Jeep Forum||17||01-13-2008 08:31 PM|
|Headers 4 350||xtremes2221||Engines & Drivetrain||2||12-04-2003 09:36 AM|
|What size bolts do I use for the Exhaust Manifold/Headers||Mwrangler29||Engines & Drivetrain||1||02-28-2002 04:47 PM|
|Water heated intake manifold vs. old CJ manifold with no smog holes (For YJ)||Brendan||Engines & Drivetrain||0||01-24-2002 02:09 PM|