Thread: Double hump head ID

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Chevy continued to use 1.94 heads on many mid level engines, even after the lager valves were added on the high horsepower options. In the late '60s they would have tapped holes in the ends of the heads. I don't remember any way to tell from the outside, and I suspect they used the same castings for both valve sizes.

I built some really good running engines with the 1.94 heads, and I doubt you would see much improvement, unless you were building a radical motor.

As a side note, I think the biggest difference was actually in the exhaust valves.