The K20A2 and K20A3 share the same 2.0-liter K-series architecture, but their compression, VTEC hardware, output and performance potential are substantially different.
LS1 crankshaft end play should measure 0.0015–0.0078 inch. Learn where the No. 3 thrust bearing is located, how crankshaft end play is measured, and what to check during an LS1 engine build.