One thing to be careful of with these motors is oiling. The expectation was that these heads (SB2 or 18 degree) would be used with dry sumps - if you're using a wet sump, make sure you restrict oil feed to the top end so you don't accumulate oil in the heads over extended high RPM pulls, which will starve the bottom end.
Mark Stielow built an 18 degree motor for his Thrasher project about 7-8 years ago, and as I recall he toasted the bearings at One Lap of America because of the oiling problem.
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