Re: WTB 4bbl intake manifold for a 23 series 327

Posted by TxGoat On 2023/11/1 11:02:58

Improvements in the automatic transmission may have contributed to better MPG on the later cars. A tighter torque converter and better shift schedule can make a substantial difference.
With most old vehicles, raising compression gives the most bang for the buck, giving improvements in both power and economy.

There are many things on older cars that can sap performance. Many of these issues can be addressed at little or no expense, or modest expense. For instance, as radial tires were becoming popular, it was widely asserted that radial tires had about 10% lower rolling resistance than comparable bias ply tires. The benefits of that on performance and economy are obvious.

Most old cars are not in an optimum state of tune, including the engine, driveline, suspension, brakes, etc.Many such cars could pick up a 10% improvement in performance simply by giving all systems a good going over .