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

Posted by TxGoat On 2023/10/31 9:23:00

If you want more power, raise compression. Adding a 4 bbl won't add much, if any, and any gain would be at high engine speeds at wide open throttle. You can probably get more power for less effort by maximizing what you have as far as tuning, clean air filter, make sure exhaust is unobstructed by dents, sticking heat valve, etc. Any needless weight aboard will reduce performance. Dragging brakes, excessively thick oil, and excessively low tire pressure will tax performance and fuel economy.
Bumping compression and seeing to the above points will improve performance, handling and fuel economy at low cost.

Packard did a good job of designing the intake, cam, and carburetor on the straight 8s to maximize useful torque, economy, and driveability. I'd be leery of making any basic design changes.