01-24-2020, 10:47 AM | #1 |
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Heads
With a Model a head I can measure based on Henrys original specs to determine how much has been removed from the heads surface.
Has anyone collected these specs for Flathead V8 heads? What is the allowable minimum thickness to mill a head to? What is the allowable difference when milling or matching two used heads? Why ask? Cuz I have this behemoth that needs to be put to work.
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Tim Downtown, Ca |
01-24-2020, 11:30 AM | #2 |
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Re: Heads
Seems to me the limiting factor is the resulting clearance/squish area between piston and head (consensus seems to be .050" minimum.)
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01-24-2020, 11:31 AM | #3 | |
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Re: Heads
Quote:
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01-24-2020, 12:44 PM | #4 |
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Re: Heads
I have always had more trouble with valves kissing the head first, not pistons. you need to measure valve clearance as well. A cam will not cause pistons to hit, only valves.
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01-24-2020, 04:11 PM | #5 |
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Re: Heads
You might want to use heads of the same type and match them. Howeve you might have to redome onr. I;t;s easy to make a doming tool out of an old file like I did, However it has to ture very slow to prevent chatter due to the small dis in the center and large at to edge, to keep chatter down. Not much of a problem in aluminum.
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01-24-2020, 06:07 PM | #6 |
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Re: Heads
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.....my list is longer than there are hours in the day. Projects on the Bridgeport are fun. If I don’t find the data I will start another page in my notebook to capture measurements off of NOS heads.
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Tim Downtown, Ca |
01-24-2020, 11:50 PM | #7 |
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Re: Heads
I have some pics of the doming tool which Ill post. I also made a fis
xture from pipe fittings for grinding the radius, But I can't find them. ET!! |
01-25-2020, 07:28 AM | #8 |
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Re: Heads
Now that you can mill the heads, you might want to try angle milling them. Taking material off over the valves. A stovk car trick was to take .060" off the valve side iff the heads.
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