D-Port Head Valve Upgrade - Big-Valve Performance on a Small Budget

Small-valve D-port heads don't have to stay that way forever—we show you how to turn them into big-valve heads without breaking the bankBig-cube performance is very popular with hobbyists, and for Pontiacs that usually includes a 400 or 455ci engine. When attempting to extract maximum performance from such combinations, many owners opt for aftermarket high-flow cast-aluminum cylinder heads. And while that can raise the cost of an already-expensive rebuild by a couple thousand dollars, it can easily translate into 500 hp or more.


Photo Gallery: D-Port Head Valve Upgrade - How to Modify Small-Valve Heads to Increase Flow - High Performance Pontiac Magazine

Photo Gallery: D-Port Head Valve Upgrade - How to Modify Small-Valve Heads to Increase Flow - High Performance Pontiac Magazine


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