I'm gonna be pulling the motor in the next 3 months, i currently have a bad misfire and may need heads. I found a set of used stage 2 ported heads with stock valves, springs and cams for cheap. He says they're in good condition but he didn't use them, ported his original heads instead. Unknown mileage. I asked how many spark plug threads be said he doesnt know but they all have timeserts. It would be an amazing deal, but it worries me they're priced this low and still for sale, i worry maybe serts are bad, guides or seals are bad, why would he buy them then port his own instead? Would you take the chance?