User contributions
- 18:37, 15 April 2017 (diff | hist) SBC cylinder head identification (Changed "H' from "1970 LT-1 Z28 use c/n 492" to 186. 492 heads were Tonawanda cast heads and Tonawanda didn't have the machining tooling to unshroud the large 2.02 intake valves until 1971)