Headers for the Chevrolet 4.3L V6 are difficult to make successful. After years of trying a handful of designs for various Jeep conversions, we're convinced that the best headers for these engines aren't headers at all, but factory style cast manifolds.
Many successful Jeep conversions have used the following manifolds.
Driver's side: GM #10093091, as found on 1989-1994 Astro / Safari and full-size van models. This manifold can be purchased from your preferred parts retailer under the Dorman #674-385.
Passenger's side: GM #12550122, as found on 1996-2005 S10, S15 and full-size van models. This manifold can be purchased from your preferred retailer under the Dorman #674-516.
For engines based on the Chevrolet 90 degree V6 family including 200 cid introduced in 1978, 229 introduced in 1980, and last and most successful the 262 otherwise known as the venerable 4.3L Vortec V6 through Gen IV.
Fits most conversion Jeeps, excepting XJ / MJ models.