Swapping a Buick 90° V6 into your Full Size Jeep? These Novak headers are a smart upgrade that help unlock performance while simplifying installation. Designed to work with the 225, 231, and 252 CID Buick V6 engines, they’ve been proven in countless Jeep conversions—from early Wagoneers to custom J-Truck builds.

Each set starts with 3/8" thick laser-cut manifold flanges featuring Novak’s unique face-ground port-seal surface. This patented design eliminates the need for gaskets when installed with high-temp RTV, delivering a cleaner, more reliable seal. The 1-1/2" primaries and 2-1/2" three-bolt collectors provide solid flow without taking up excess space, and the medium-length design (12"–13") offers flexibility in tight FSJ engine bays.

Two finish options are available: bare steel for DIY coatings or Novak’s aluminized ceramic coating for superior corrosion resistance and reduced under-hood temps.

What’s Included:

• Left and right headers
• Header flange bolts
• Collector flange rings
• Collector flanges

Compatible Engines

The Buick 90 Degree V6 engine of 225, 231 and 252 cid with BOP (Buick, Oldsmobile, Pontiac) bellhousing pattern are compatible with these headers. Later 60 degree pattern bellhousing front and rear wheel drive versions are NOT compatible with the headers.

Compatible Jeeps

Our Buick V6 headers fit very well in most applications. Pre-1972 Jeeps which use the Ross bellcrank steering conglomeration won't be compatible with these headers in most situations. A Saginaw steering conversion is recommended, and for more reasons than just exhaust clearance. However, because of the variety of methods used in these steering and some engine conversions, Novak cannot guarantee that our Buick V6 headers will work for your situation.

Installation Tips:

For best results, Novak recommends installing these headers using a high-temperature RTV sealant such as Ultra Black®—no gasket required. This method has consistently provided an excellent seal. That said, some builders have also achieved good results using OEM-style multi-layer steel (MLS) gaskets.

Collector gaskets and bolts are not included. For optimal sealing and to prevent blowouts at the collector flange, we recommend using solid copper gaskets.

Detailed installation instructions are included with the kit.

Exhaust Routing Options:
Thanks to their short, block-hugging design, these headers give you several clean routing options for your exhaust system:

• Route one pipe under the oil pan (just in front of the sump), merging into the opposite side and running rearward—typically on the side opposite the transfer case drop.
• Same as above, but routed under the bellhousing slope instead.
• Or, route both pipes behind the transfer case, allowing the tailpipe to exit on either the driver or passenger side.