"...thinking that they were close to 72 or 75 cc chambers..."
That's a good point. I just looked up about 5 or so head info sites. EVERY one shows #17 heads to have 72cc chambers.
"...My 17's cc'd right at 83.5 cc's. I checked 2 chambers on each head, these heads are untouched..."
So, obviously, those sites must have bad info, at least for the #17 heads.
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