On the SD Performance website, Dave recommends checking had bolt thread length, especially if heads have been milled. If there are not enough threads on a head bolt (saying that IF the smooth shank of the bolt sticks out past the head surface OR is real close) you will need washers. Of course this needs to be done with head off the engine... IF it were mine, I'd take the heads back off and check them!!!
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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