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You cannot buy them unassembled. If you want to build anything really healthy you are going to have to buy new springs , retainers and locks. I did not want to waste money on parts I would never use.....That is why I did not buy them.

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This is the answer you get from the people that don't own a pair and just want to stir up crap.
Do a search on the heads and you will find hundreds of opinions.
I own a pair of the first that was made.I have beat the snot out of them for 1 season. I gained .2 to .35 in the 1/8th mile over a pair of very good ported 915s.No other changes just the heads.I had to use roller springs so the stock retainers and springs had to be replaced but there was nothing wrong with them.

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