Nissan 13202-9Z000 Valve-Exhaust

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The machine shop will remove the valves and springs, recondition or replace the valves and valve seats, recondition or replace the valve guides, check and replace the valve springs, spring retainers, and valve stem keepers (as necessary), replace the valve seals with new ones, reassemble the valve components, and ensure the installed spring height is correct. The cylinder head gasket surface will also be resurfaced if it's warped.

A home mechanic can undertake the removal and disassembly of the heads, perform initial cleaning and inspection, and then reassemble and deliver them to an automotive machine shop for the actual service work.