The motor complete isn't worth much and majority of people who mod these cars wont touch the heads on these vehicles, so they don't carry much value. I'd say $20-40 more then the cams themselves go for.
Personally i would only want a set of ZE heads with matching ZE cams. Reason being that they are worn in together. When you start blindly swapping cams and not checking the journal clearances is when you wind up with cams which seize & break.
From a money stand point selling the cams & heads separate they are worth more.
You cant get an Inline 6 cyl head rebuilt for less than 700-900...(atleast locally arround my area done in quality shops) why people sell rebuilt DE or ZE heads for 300 for a pair is beyond me. They are worth 300 per head with cams if rebuilt low mileage & used.
As BShark said expect anywhere from 200-250 in used non rebuilt JDM mileage state. If with cams ask for 400 ish
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