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856, D407 valve protrusion Specs


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Valve protrusion for the Intake valve is Flush (= or -) .0065

Valve protrusion for the Exhaust valve is .0815 - .0945

After grinding max allowable recession for the Intake valve is .0225

After grinding min allowable protrusion fir the Exhaust valve is .0655

These specs came from the GSS1346G  Service Manual


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Charlie beat me to it.

Make sure when the machine shop does the valves, that they are at the very top of the spec.



Even if the valve are within spec but on the low end it still effects how well it starts in the cold. 

Had one bite us in the rear once. 

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