Replace the bolts when you replace the WP. When I replaced mine several years ago, I torqued the head off one of the bolts at 7.5 FTLB!. Fortunately, there was enough sticking out of the block to easily remove it. I replaced the bolts with grade 8 capheads. I posted a thread on this.
YMMV
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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