Spent more than a little time crunching these very numbers. YMMV
I have a couple quotes in the $1600 range for the head work as well as the actual cost when I had the 930 engine rebuilt. This includes r&r the heads, new guides, seals and exhaust valves. Intake valves are "if needed" and I think around $500. It also assumes reusing the springs, etc.
"Assembly" stuff like ramps, gaskets, return tubes, etc should be < $300.
Conventional wisdom says if the heads are off, replace the studs, r&r the rods and replace the bolts.
I end up around $4k with all the above, all DIY except the headwork and rods.
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Greg DuPertuis
When in doubt, always mount a scratch monkey.
Leesburg, VA
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