About 351clevelanddyno.com
351clevelanddyno.com is one of six free engine dyno simulators built by McGonster Monster Motors, a one-man shop in Collinsville, Oklahoma. I'm Mike McGonigal — a professional motorcycle mechanic by trade and a Ford guy by upbringing, with the 351 Cleveland as the engine I know best. The tools started as a spreadsheet for my own builds and turned into this.
Every calculator is checked against published dyno pulls — Westech, Lykins, Holdener, shop videos with the sheet on screen — and re-checked when we find a new one. The parts lists are real part numbers you can buy today; if something is discontinued or unconfirmed, the dropdown says so.
The site is free because the parts links pay for it. When you buy through a Summit, Amazon, or eBay link here, we earn a small commission and you pay the same price. We link the part we would buy, not the one that pays the most, and the calculator does not know or care which link you click.
The other five tools: SBC 350, BBC 454, Harley Twin Cam, Milwaukee-Eight, and Predator 212. Guides for all of them live at mcgonster.com.