40plyguy Posted June 22, 2017 Report Share Posted June 22, 2017 Wondering what the plug located in the head in the combustion chamber of #6 cyl is for? Quote Link to comment Share on other sites More sharing options...
Silverdome Posted June 22, 2017 Report Share Posted June 22, 2017 To find top dead center and/or stroke length. Quote Link to comment Share on other sites More sharing options...
Hubler13f Posted June 22, 2017 Report Share Posted June 22, 2017 I pulled that plug the other day to find TDC and found it to be filled with carbon build up or something, I carefully replaced it trying not to dislodge whatever is blocking it, I didn't see anything out of the ordinary while the head was off, but mine is definitely blocked. Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 22, 2017 Report Share Posted June 22, 2017 If the head is off it is the best time to clean out the hole. Use a gun cleaning wire brush. Quote Link to comment Share on other sites More sharing options...
jeffsunzeri Posted June 22, 2017 Report Share Posted June 22, 2017 6 minutes ago, Hubler13f said: I pulled that plug the other day to find TDC and found it to be filled with carbon build up or something, I carefully replaced it trying not to dislodge whatever is blocking it, I didn't see anything out of the ordinary while the head was off, but mine is definitely blocked. Entirely common. It won't hurt a thing to drill through the carbon to allow a welding rod to insert. Quote Link to comment Share on other sites More sharing options...
Hubler13f Posted June 22, 2017 Report Share Posted June 22, 2017 7 minutes ago, jeffsunzeri said: Entirely common. It won't hurt a thing to drill through the carbon to allow a welding rod to insert. Thanks good to know, I just didn't want to knock it loose after I got everything back together and have it get lodged or block a valve open. I'm sure if it's carbon it wouldn't last long, just made me nervous. Quote Link to comment Share on other sites More sharing options...
plyroadking Posted June 23, 2017 Report Share Posted June 23, 2017 It also doubles as an explosion whistle port..... 4 Quote Link to comment Share on other sites More sharing options...
medium_jon Posted June 23, 2017 Report Share Posted June 23, 2017 It also doubles as an explosion whistle port..... @plyroadking: that is right Special Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted June 23, 2017 Report Share Posted June 23, 2017 The wolf whistles I have seen run om manifold vacuum not cylinder pressure. Quote Link to comment Share on other sites More sharing options...
plyroadking Posted June 23, 2017 Report Share Posted June 23, 2017 1 hour ago, Don Coatney said: The wolf whistles I have seen run om manifold vacuum not cylinder pressure. You're correct, I've got a wolf whistle too, on the a vacuum port. Explosion whistles run off of compression. Quote Link to comment Share on other sites More sharing options...
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