Stroking the crankshaft to your utmost 81mm will keep the RPM capacity intact. Bores is often brought out to 83mm, but test to maintain it underneath 82.5mm. There is not any have to have to the Formula Atlantic crankshaft. Reject blocks that can have to have 83mm to clean up, https://4age20vblacktopforsale57765.blogozz.com/26485483/rumored-buzz-on-4a-ge-engine-for-sale