X head chambers?

krazykuda said
I've had 340/360 heads measure from 69-72 cc...

You don't know if there was any machining done to them before you get them, so you have to measure each head to find out...
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The J heads were cc'd to 67cc's and had a mild porting job. The X heads are untouched, as-removed with a whole lotta miles on them. I have not measured the X heads.