04-22-2024, 10:55 AM
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#13
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Senior Member
Join Date: May 2015
Posts: 8,497
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Re: Flathead exhaust valve guide seals
Quote:
Originally Posted by Bored&Stroked
BTTT: Here is how I just did it:
Here is the problem - all the guides I've ever used are fairly loose in the guide bore. This is something that I 'fix' with knurling. When Ron talks about knurling, he is talking about the traditional knurling of the valve guide bore to tighten up guide bore to valve stem clearances. I know some experienced racers that won't knurl flathead valve guides (especially the exhaust), they install bronze liners. The reason is that they want better heat transfer from the valve stem to the guide and tightly fitting bronze liners do this supposedly better than a knurled cast iron one.
Video: The problem with loose fitting guides (in the block):
https://www.youtube.com/watch?v=qZBXFMqHs-c
Here is the knurling process and final result:
Video: Knurling:
https://www.youtube.com/watch?v=UqYqBIy1BAI
Here are some final guide pictures - you can see my spring spacers for the Isky 185-G springs as well as the cut-back section I do on the top of the valve guides (so they don't obstruct the port).
Enjoy:
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__________________
The only thing nice about being imperfect is the joy it brings to others....
"Silver rings, your butt! Them's washers!"
"We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969
https://www.youtube.com/watch?v=7NReUd2_0u0
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