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How much vacuum does a 302 ford create?

The amount of vacuum created by a 302 Ford engine depends on several factors, including engine speed and camshaft profile, as well as modifications made to the engine (e.g. ported heads).

As a general guideline, a stock 302 Ford engine typically creates between 15-20 inches of vacuum at idle and around 10-15 inches of vacuum at higher engine speeds.

Modifications to the engine, such as installing a performance camshaft or porting the heads, can increase the amount of vacuum created at idle, while decreasing the amount of vacuum created at higher engine speeds.