FORUM
Sales / Scratch & Dent
Conversion JK Headers
for
GM Gen III & Gen IV Engines
Kit contents:
- Headers, left & right
- Header flange bolts
- Collector flange rings
- Collector flanges
The GM LS V8 engine are prime engines for JK Jeeps. Designing exhaust headers to fit just right into a JK wasn't a cake walk, but the result is spot on.
The header starts with a generous, 3/8" thick manifold flange. A patented port-seal surface is face ground at the mounting face of the engine head such that they can be used without a gasket (see installation notes below for more information). Headers feature 1-3/4" primary tubes with a 3" three-bolt style collector.
Coated or Natural Steel
The basic header is offered in natural steel, which the customer can optionally finish in a variety of hi-temp enamels or other finishes that will offer rust protection and good appearance. However, the best thermal and corrosion protection for your headers is our aluminized ceramic coating. This finish offers the added benefit of lower under-hood temperatures and the highest level of protection to the header.
California Compliance
These headers are not California CARB approved.
Compatible Engines
These headers are compatible with Gen III & IV GM V8 engines, this includes both the LS and Vortec engines starting with the LS1 in 1997. The truck Vortec series started in 1999. If your exhaust ports are paired in the center these will NOT fit and you likely have a Gen I or II engine needing these headers.
Compatible Jeeps
These headers are designed specifically for conversions in the JK Jeep chassis.
While still a block-hugging design, the JK requires a header that is swept back more to route the primary pipe more rearward.
Installation Requirements
Recommended installation to the engine is high temperature RTV such as Ultra Black® without a gasket. We have found this works exceptionally well. Some have used the original equipment type MLS (multi-layer steel) gaskets with good success. Collector gaskets and bolts are not included with the headers. We recommend using solid copper gaskets to avoid blowouts at that joint. Instructions are provided with the headers.
The short, block-hugging design allows the installer to have the exhaust routed in one of the following three popular ways:
- One circuit under the oil pan, just in front of the sump merging into the opposite circuit which is typically run rearward on the side of the Jeep opposite that of the drop of its transfer case.
- As above, but under the bellhousing slope.
- As above, but behind the transfer case. Then, the exhaust tailpipe can exit the Jeep on either the driver's or passenger's side.
