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An 81SC with 170k miles and never had a top end build, I should think there are several others that would back me up on the opinion that at a minimum, the exhaust valve guides are toast. Probably a terrible analogy, but I think that your focus on the CIS at this point is akin to an automobile crash patient with a broken neck and a broken arm---and you are looking at the arm first. Realize this advice is coming from someone that bought an 82SC at a price point that IF it had unknown head stud problems (had great compression numbers but didn't remove the lower valve covers and inspect studs) I still had money in the budget to spend another 10k and not be upside down in the market. I threw the dice. I lost. Spent the 10k on the engine. I'm ok with it. Question to you, would you be comfortable, with the little you know about the car right now, to have more than 30k in it?
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