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Best way to remove sludge from engine?


I just got through replacing valve stem seals (puffing blue smoke on start up) on a 88’ crusader 454. 12 out of the 16 seals were split down the middle. Due to the oil leaking on top of the valves, I noticed a lot of sludge on the top of the intake valves. Guessing the exhaust valves may be the same. Does anybody have recommendations to clean these up? I’ve read some about Seafoam and Marvel Mystery Oil. Will it take care of itself after run a while? Thanks, Vic

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