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- - Engine size (https://camaroforums.com/forum/engine-internal-23/engine-size-65292/)

Shalamara

10-05-2011 03:28 PM

Engine size

Why did GM build 3 motors so close together in size? 302ci, 305ci, and the 307ci

z28pete

10-05-2011 07:04 PM

The engines are similar in displacement, but the internal dimensions are entirely different.
302 4" bore X 3" stroke (Free breathing high revver)
305 3.74" bore X 3.48" stroke (Built to meet pollution control)
307 3.87" bore X 3.25" stroke ( No good reason for it)

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