I had my 14 bolt heads machined down to 28cc combustion chambers, valves lapped valves, guides and springs measured and new valve stem seals installed for $220 per head. that was at a local machine shop here in perth.
I got the cc chambers reduced as the head where going on a low comp 4.6 short motor. I discussed why i needed the heads machined down with the engine builder and his response was "just turbo it" I love the way he thinks......![]()


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