Join Date: Jun 2012
Location: Tasmania, Australia
Drives: 2004 Carnival, 2.5L KV6 / GV6 / K5 engine
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Can't say for sure on the Kia 3.5L, but some years ago a friend had the timing go out on a Nissan and had broken valves & dented pistons. He had it back together before I had a chance to see the damage myself so can't comment on the depth, but he said he just replaced the valves, cleaned up the piston tops to check for fractures & cracks, and just dressed out some of the sharper edges with a Dremel to avoid any chance of hotspots. Would be 5 years ago, and I know the thing was still going 18 months ago.
Others wiser that I may care to opine, but given the work to change them, may be worth just running with the indentations & see how it goes.
Edit: Spoke to him this evening and he recalls the depth being mostly about 1mm or so, maybe close to 2mm in places. Its still going strong, was 7 years ago (yikes).
Last edited by PeterBlue; 11-12-2012 at 02:25 AM.