I use to have to chase threads on Harley engines and transmissions when I was a Harley tech and several times there was a risk of metal or whatever getting into the engine or transmission. I would dip the tap or chaser in grease and the shavings would stick to the grease and come out with the tap.
Using a thread chaser on an Iron head
Rectangular port 188's on a 454. The heads are on the block. I'm concerned about crud and maybe a some metal shavings where they might end up (I am using a true thread chaser kit, not a tap, but I still think some metal may be cut out with the chaser). I see that some of the holes have passages past the threads. I can use grease on the thread chaser but wonder if I'm doing more harm than good. So should I chase the threads in the head or leave them be?
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