Knurling a piston ???????

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John M. Wright - 26 Nov 2004 17:02 GMT

I just took my 300 block in to be tanked and bored. The guy at the machine
shop says that the block isnt worn enough to need boring. Just a hone and
piston knurling should be good enough. I've seen knurled valve guides, but
a knurled piston ?OK, thats a new one on me. Is this a good thing or should
I insist on reboring and not play with pistons with over 100,000 miles on
them ?? Thoughts ?? Thanks for your time

John

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Toy - 26 Nov 2004 17:21 GMT

>I just took my 300 block in to be tanked and bored. The guy at the machine
> shop says that the block isnt worn enough to need boring. Just a hone and
[quoted text clipped - 6 lines]
>
> John

Google reveals all you need to know

toy

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Steve W. - 26 Nov 2004 20:56 GMT

OLD time way to resize the piston so it fits better. I would just bore
it and use new pistons, rings.
Much better and will last much longer than knurling.

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Steve Williams
Near Cooperstown NY

> I just took my 300 block in to be tanked and bored. The guy at the machine
> shop says that the block isnt worn enough to need boring. Just a hone and
[quoted text clipped - 4 lines]
>
> John

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Peter D. Hipson - 27 Nov 2004 14:28 GMT

Yes: you can knurl a piston.
No: it is not usually done, but sometimes it helps. However, for an
engine that is expected to have a long life, knurling the pistion is
not the best idea.
No: if it is not worn, do not rebore the block!
Yes: do hone the cylinders (you can do this yourself if you want)

>I just took my 300 block in to be tanked and bored. The guy at the machine
>shop says that the block isnt worn enough to need boring. Just a hone and
[quoted text clipped - 4 lines]
>
>John

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