I think a good o-ring #428 ought to deal with anything even a hot Zs190 swap, we talking at the farthest end possible 212cc, you just dont need a 520 for that. Not enough weight or HP / Torque stress to need a 520, but you can put what ever makes you happy on there, but I think anything over #428 is going to cause as many issues as it solves , especially on the front sprocket case clearance .
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2001 Mustang GT
2004 Sportster
2018 VADER
2020 Orion RXB250L
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