2 things. 1) see FAQs section on fuel economy. I have a few mods on my 89 n/a, and with a/c on I get 15 city....20 hwy. A/C off I get 17-22.
2) I work at a shop here in Calif. Head gasket/valve job would cost you, the customer, $1800. Better make sure to do ALL the small stuff too. Like...hoses, flush system, vacuum lines, clean EVERYTHING while its off, belts, idler bearing?,water pump, etc......
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