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Pro tip: pull the injector before you trust a compression test on a 6.7 Cummins
Had a truck in my bay on 8 Mile with a miss and low power, and I almost sold the guy a head gasket job based on a 280 psi reading on cylinder 4. Pulled the injector first on a hunch and found the copper washer chewed to nothing, letting all that compression leak past into the fuel rail. New washer and a reseat, and it fired up clean with 385 psi. If you get one low hole on these motors, pull the injector before you pull the head, what's your go to check order?
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