Editing Pontiac V8 engine (section)

===Pontiac SOHC 421CID V8===
Most likely prompted by its development of the Pontiac OHC six, the GM division built three different experimental SOHC 421 CID V8 engines in the early 1960s. According to the engineers who worked on the project, the SOHC 421 engines produced around 625&nbsp;hp and were capable of turning 7,000&nbsp;rpm.

One version of the engine featured camshafts driven off the front of the engine, another design had the cams driven by gears off the back of the engine. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac.
<ref>{{cite web | url=https://www.macsmotorcitygarage.com/mckellars-masterpiece-the-pontiac-overhead-cam-421-v8/ | title=McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8 | date=10 March 2022 }}</ref>