Engine Dyno Test Hi Po Casting
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The '65 Hi-Po engine did receive dedicated cylinder heads, but the only real difference between a Hi-Po casting and any other 4V 289 head was the use of screw-in rocker studs (no guide plates) and cast-in spring pockets. From a flow (and power) standpoint, the ports on '65 Hi-Po heads were no different than any other '65-'67 289 casting (221 and 260 heads were smaller). View Related Article
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