Checking a Ford Head

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Model T Ford Forum: Forum 2014: Checking a Ford Head
Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Thursday, July 17, 2014 - 05:45 am:

Other than cc'ing (measuring combustion volume), is there a way to tell how much a Ford high head (26-27) has been milled? I have one that I know has been milled probably .030; maybe .050, but I don't know for sure. Can you measure the distance between the block surface and the top of a head bolt boss on the edge of the head? If so, How much should that measurement be?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Thursday, July 17, 2014 - 10:22 am:

I have four unmilled (as far as I can tell) high heads in the garage. All of them measures between 2.680" and 2.700", most of them around 2.680".


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Thursday, July 17, 2014 - 11:21 am:

Thanks, Roger. I'll measure mine. I should see an appreciable difference to your measurement.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Todd on Friday, July 18, 2014 - 11:16 am:

Copied this offn the forum a couple of years ago:
Ford factory drawing it is 2 11/16 or 2.6875.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Friday, July 18, 2014 - 11:25 am:

Thanks, Todd and Roger.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Friday, July 18, 2014 - 11:39 am:

Ken is correct. Factory drawing states the following:

Head bolt boss to milled base is 2 11/16".

Water outlet bolt hole center to milled base is 2 31/32"


Top of pagePrevious messageNext messageBottom of page Link to this message  By Manuel Voyages, ACT Australia on Sunday, July 20, 2014 - 08:10 pm:

Is this just for 26-27 heads?
What about earlier ones?

Manuel in Oz


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Sunday, July 20, 2014 - 08:24 pm:

Manuel, someone will either back me or say I'm wrong, but I would think low heads and aftermarket heads would have different specs.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Todd on Monday, July 21, 2014 - 10:35 am:

According to the Model T encyclopedia:

07-17-14 T401C Added 3/32 to bottom of head, increases all top to bottom dimensions and lowers compression.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Monday, September 15, 2014 - 03:41 pm:

I measured the head that I thought had been milled. Either I measured the wrong head, or the machinist told me he milled it, but didn't and ripped me off.


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