Depth of Intake Valve Piston Notch Cut

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Depth of Intake Valve Piston Notch Cut Empty Depth of Intake Valve Piston Notch Cut

Post  1EFF100 on December 3rd 2019, 11:19 am

How deep does the notch need to be cut for 2.20 intake valves in D0VE heads on H612CP pistons? Pistons in the hole approximately .025.
Will be doing this using a bare D0VE head on an assembled short block, head resting on the block with no head gasket. 2.25 cutter.

Thanks.
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Post  gt350hr on December 3rd 2019, 1:45 pm

It is very dependent on the camshaft. The tight spot is "around" 10 after TDC on the intake opening . Don't focus on total lift as the piston is far away from the valve at that point. A good "starting point" is .180 at the deepest point. ( from the "deck"). At .025 down like your piston is .160 would be OK.

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Post  1EFF100 on December 3rd 2019, 7:24 pm

gt350hr wrote:It is very dependent on the camshaft. The tight spot is "around" 10 after TDC on the intake opening . Don't focus on total lift as the piston is far away from the valve at that point. A good "starting point" is .180 at the deepest point. ( from the "deck"). At .025 down like your piston is .160 would be OK.

Cool, thank you. Cool

So, the cutter resting on the piston, then measure up .160 up the tool guide from the top of the valve guide?
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Post  gt350hr on December 6th 2019, 1:26 pm

No , the "pocket" depth from the "deck " of the piston to the deepest point.

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Post  The Mad Porter on December 7th 2019, 3:18 pm

With your modest cam timing the notch doesn't need to be deeper but larger in diameter.

Use the larger diameter cutter head 2.375" to enlarge the pocket radially but not any deeper.



SJ
used 2b RHP



santa
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Post  1EFF100 on December 9th 2019, 9:36 am

The Mad Porter wrote:With your modest cam timing the notch doesn't need to be deeper but larger in diameter.

Use the larger diameter cutter head 2.375" to enlarge the pocket radially but not any deeper.



SJ
used 2b RHP



santa
Excellent. Thank you, Scott. Smile
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