whats the angle of the bolt hole on the newer heads
 

I need to have beveled washers made for the inner intake bolts on my HSR and I need to know the 2 angles.

the bolt angle is 72*. so flat bottom and 72* top side.

thank you. i was 99% sure it was 72 but I wanted more proof. I ll be having some angle washers made up this week. my dad is a machinist so its not a big deal for him to make a few for me.