Stroking the crankshaft to the utmost 81mm will continue to keep the RPM functionality intact. Bores can be introduced out to 83mm, but try to maintain it underneath 82.5mm. There is not any need to have for that Formula Atlantic crankshaft. Reject blocks that could require 83mm to clean up, https://4ageenginesale83692.atualblog.com/32712211/rumored-buzz-on-toyota-4a-ge