Flow Comparison Between Factory 428 Cobra Jet Heads and Edelbrock FE Heads

The flow data shown at right shows a comparison between out of the box Edelbrock heads and factory Ford 428 Cobra Jet heads. The Cobra Jet heads have been given a minor bowl clean-up, but are otherwise stock. Both sets of heads use identical valve sizes, and were both tested with a clay radius on the intake port and a 1 3/4" pipe on the exhaust port. Test data was taken on a SuperFlow SF-600 flow bench.

From a flow perspective, it appears that the intake ports are very close to the same, even though the Edelbrock heads use a medium riser port size and the Cobra Jet ports use a low-riser port. On the exhaust, the Edelbrock heads show an advantage at the higher lift numbers. From this data it is clear that the Edelbrock heads would be a good substitute for factory Cobra Jet heads, and would offer the advantage of aluminum construction as well.

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