The Ford Barn

aussie merc · 09-03-2022, 02:17 AM

simple question but worth asking has anyone redrilled early 59a heads [center outlet ] the second boss [rear on each head] appears to be cast into the head [for temp sender etc] but has not been drilled Simply dont want to drill to find that theres not enough metal to support the thread

Mart · 09-03-2022, 07:04 AM

If there is a boss, there ought to be enough material for the thread. They wouldn't cast the boss in if it was not going to get drilled for some application or other. You might be able to get a finger down the hole and feel the other side.

Mart.

Bored&Stroked · 09-03-2022, 07:44 AM

I would have no problem drilling/tapping it. Make sure you have a high-quality tap and use plenty of cutting oil. What you don't want to do is put too much outward pressure on the boss and crack it.

Same goes for when you put the brass adapter fitting into it, use a good thread sealer and don't over-tighten the adapter - as it is easy for a tapered pipe-thread to crack the boss as well.

Ol' Ron · 09-03-2022, 09:41 AM

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Yes ,no problem. Didone with a Bridgeport. Took a week to get the head back to ZERO!!!\eye ball on the rest.
Gramps

09-03-2022, 02:17 AM	#1
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,034	redrilling heads simple question but worth asking has anyone redrilled early 59a heads [center outlet ] the second boss [rear on each head] appears to be cast into the head [for temp sender etc] but has not been drilled Simply dont want to drill to find that theres not enough metal to support the thread

09-03-2022, 07:04 AM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,755	Re: redrilling heads If there is a boss, there ought to be enough material for the thread. They wouldn't cast the boss in if it was not going to get drilled for some application or other. You might be able to get a finger down the hole and feel the other side. Mart.

09-03-2022, 07:44 AM	#3
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,070	Re: redrilling heads I would have no problem drilling/tapping it. Make sure you have a high-quality tap and use plenty of cutting oil. What you don't want to do is put too much outward pressure on the boss and crack it. Same goes for when you put the brass adapter fitting into it, use a good thread sealer and don't over-tighten the adapter - as it is easy for a tapered pipe-thread to crack the boss as well.

09-03-2022, 09:41 AM	#4
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: redrilling heads Sponsored Links (Register now to hide all advertisements) Yes ,no problem. Didone with a Bridgeport. Took a week to get the head back to ZERO!!!\eye ball on the rest. Gramps