Find out if they are complete heads (seals, springs etc ) or not. What type/brand vales, and what size valves? If the heads were machined to accept other then stock springs, and flow numbers would be nice too.
Heads could run from around $500 to near $1,500 depending on how much port work and what parts they have in them.
If your investing in heads, I would suggest looking for larger then stock valves. Typically built heads have 2.02 1.60 valves. I also lean towards using 2 double springs (normally require the pockets machined).
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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