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The 915 heads look original so they wouldn't have the hardened seats in them right ? the 906's look like they have had some work done to them recently how can I tell if they have hardened seats in them ? 10 years ago I would have just taken the motor that's on the stand now painted it and ran the crap out of it but I just can't do it now.. Did I grow up ?



The added cost of putting seats in the 915's is minimal in the big picture of the rebuild. The 906 is an open chamber head , not the perfect choice especially since you have the 915's .

Are you going to be putting 20k miles a year on the car ?