Free precision build tools for American iron — built by a working mechanic who got tired of guessing. No ads inside the tools. No paywalls. No BS.
Every tool in the MMM network lets you build a full combination, see the dyno curve, and find the best price on the exact parts you just selected. All free. All built by someone who actually turns wrenches.
Calibrated against Fuel Moto's published 103" shootout data. 31 cams, 14 heads, 12 induction options, full carb jetting for CV40, HSR42/45/48, S&S Super E/G, and EFI.
8 head castings with real lift-curve flow data. Holley primary/secondary jet recommendations, Edelbrock metering rod and step-up spring guidance, smart valve spring picker.
Full jetting for Mikuni VM22/26, PZ22/26, Tillotson HL, and Walbro — adjusted for your elevation and temperature. Rev limiter coil simulation, rocker arm pushrod calculator, smart spring picker.
Small block Chevy — the most-built engine in American history. Coming soon.
The next generation H-D V-Twin. EFI tuning guidance, Stage 1-4 configurations. Coming soon.
The swap king. LS1 through LS3 with cam, heads, tune, and intake combinations. Coming soon.
Mike McGonigal learned to wrench from his dad. Not in a shop — in the driveway, on real cars, with real consequences. By the time he graduated high school he'd already built hot rods that ran. A '68 Mustang with a 351 Cleveland that ran elevens. An '83 Mustang GT with a 377 Windsor stroker that ran tens. Built by hand. Earned the hard way.
After school he went into sheet metal fabrication at Crane Carrier, learning how to run industrial equipment. Then the tower industry found him. Working for Rex Gotcher climbing communication towers, you don't just climb — you keep everything running. Diesel generators. Gas equipment. Trucks. Whatever it takes to stay on the air. Tower dogs don't call a mechanic. They are the mechanic.
When tower season slowed down, Mike went back to the shop. Dealerships. Independent work. Always wrenching. Eventually found a home as Chief Mechanic at Bottoms Up Chop Shop in Collinsville, Oklahoma. H-D Twin Cams, Shovelheads, Pan Heads, Knuckle Heads — he's turned wrenches on all of it.
These tools exist because after decades of building combinations the hard way, Mike decided to build something that helps every other builder skip the guesswork. The jetting numbers come from real carbs on real engines. The cam profiles are calibrated against published dyno data. The spring recommendations come from someone who's actually floated a valve into a piston.
Every tool in the network works the same way. Pick your parts, see the result, buy with confidence.
Choose your displacement, heads, cam, carb, exhaust, and every other variable that affects power. Each selector is stocked with real parts from real vendors.
The tool generates a predicted dyno curve — horsepower and torque vs RPM — based on real physics models calibrated against published dyno data.
Every carb in the network gives you a complete jetting recommendation — main jet, pilot jet, needle clip, fuel screw — adjusted for your elevation and temperature.
Every part links to trusted vendors — Summit, JEGS, GoPowerSports, ARC Racing, and more. Compare prices, click through, and build it right the first time.