If maximum authenticity is the desired goal, the solution is to simply reuse the parts that were on the car or replace them. Direct-replacement components or kits that are readily available for most first-generation Mustang models. In our case, we wanted to do a bit better because we had upgraded the engine to achieve higher performance. These engine modifications would be pointless unless we used a freer-flowing exhaust system that’s commensurate with our resulting airflow increase. We did not want to use headers, both for durability and aesthetic reasons, so we decided to use the higher-flow cast-iron exhaust manifolds that were standard equipment on high-performance K-code models of the 289-ci engine. The factory rated these at a similar power level to what we believe our engine would produce and thus we felt the use of these freer-flowing exhaust manifolds would be best for the goals we had in mind.
This Tech Tip is From the Full Book, HOW TO RESTORE YOUR MUSTANG 1964 1/2-1973. For a comprehensive guide on this entire subject you can visit this link:
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We would surely have opted for headers had we wanted to achieve a higher level of power/performance and not been as concerned with keeping a factory appearance. Many different types of headers are available for those who choose that option. Our choice did require a bit of luck since the 289 K-code engine was no longer offered in 1968 Mustangs. Fortunately, it was still available in the similar 1967 body style, which allowed us to piece together a system that would work. In the photos, I show the components we decided on and further explain their features and rationale. I also touch on a couple of other performance tips you might want to consider implementing in your restoration.
Written by Frank Bohanan and Republished with Permission of CarTech Inc