DO NOT blast them. any type of blasting material get get stuck in the oil dripper assembly and not be able to be removed easily. The grit WILL come loose when the engine is running, without doubt...
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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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