Quote:
Originally Posted by Tim Ayers
Can we circle back to the idea of using a tap and not a chaser? I understand the difference and get the physics aspect of this in regards to cleaning out all the rust and scale.
Caveat: This is what I've read, but have not actually compared. I thought the thread pitch Ford used for their head stud holes is not the same standard pitch we use today. That's why some say to make a chaser out of a an old head bolt by cutting flutes into the side.
I'd really like to know is this fact or fiction.
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Sort of true, but "pitch" is not the correct term.
It's just the diameter that ford held tight. You can buy taps that are correct to match the ford thread spec, but a general purpose one bought willy nilly will probably not be to that tighter spec. Someone did post the correct spec once on this forum but I can't remember who it was or the title of the thread.
I use a set of blue point thread chasers. They have proved invaluable over the years.