| I bought a set of heads barrels and pistons from a bike that had it's bottom end destroyed after only 1500 miles.
My original plan was to swap the heads completely after a bit of re-working, however they're not a straight swap between the later 748 and the earlier, so I stripped it for rockers. I had to replace all of mine at 16K (in Feb), and paid less than £200 for the heads etc so it made sense to me, and the heads came from a very late model 748. The rockers that came out of the new heads looked exactly as they should with no signs of imminent failure, and that's as good as I can expect for £200.
Whilst it was stripped I had the whole top end refurbished, which I couldn't have afforded had I needed to replace all the rockers at full price.
MBP do an exchange service for replating at $45 each, and you're probably looking at a 4 week turnaround since they have to cross the atlantic twice. I think MegaCycle charge around $80 per rocker but they grind down and build up with a harder material, again delivery time's the issues
On a personal note, I always feel DukeDemon's prices are a little too rich for used parts.  | 
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