Operation CHARM: Car repair manuals for everyone.

Surface Flatness

Head Flange Warpage
Standard 0.25 mm (0.010 in. max.)
Service Limit 0.35 mm (0.014 in. max.)
Down Pipe Warpage
Standard 0.4 mm (0.016 in. max.)
Service Limit 0.40 mm (0.016 in. max.)