McGonster Monster Motors · Free Tool
351 Cleveland
Dyno
Ford 351C Build Simulator · Build it right · Buy it cheap
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Calibrated to published dyno data
Depends on the build. The 4V ports are huge and want RPM; the 2V heads keep port velocity up for the street. But the old "4V heads are too big, they kill torque" line is overblown — they don't make truck torque, but it's surprising what they actually do. The calculator carries 8 castings with real lift-curve flow data — compare them on your combo and let the curve settle the argument.
Yes — and here's the catch: all the American 2V heads are open chamber, and open chambers kinda suck. The closed-chamber 2V heads came out of Australia, and they make a big difference. On the 4V side, plenty are open chamber too — the good ones are closed chamber, and those are the coveted heads. Closed chambers give you real quench and tolerate more compression on pump gas; know which chambers you have before you pick pistons.
With iron closed-chamber heads and proper quench, 10:1 is the sweet spot on 93 octane — push to 10.5:1 and the margin gets too narrow, and you're risking detonation. Aluminum heads are a different story: 10.5:1 is awesome, and with the right cam you can sometimes push 11:1. Cam timing moves the effective number — a bigger cam bleeds cylinder pressure, which is why cam and compression get picked together.
A 4.00" stroke crank in a 0.030-over 351C block is the classic torque fix — Cleveland heads flow like a big block, and the stroker gives them the displacement to use it. The calculator is 408-ready; compare a stock-stroke 351 against the 408 with the same top end and watch the torque curve move.
The Cleveland's canted-valve heads love lift more than duration — velocity rises in the head the more you lift the valve off the seat, and 0.550"–0.600" lift is generally the sweet spot on a hot street engine. On a 2V street build, a mid-range hydraulic grind beats the giant solids people love to over-buy. Build it in the tool's 12 grinds and pay attention to where torque peaks vs your gearing and converter.
Either works; they meter differently. The calculator gives Holley primary AND secondary jets, or Edelbrock metering rods and step-up springs, matched to your combination, elevation, and temperature.
If you change the cam, check the springs — the smart spring picker in the tool matches spring pressure to your cam's lift and your rev target. As for rockers: the factory stamped-steel rockers just bolt in place and are non-adjustable — the only Cleveland that came with an adjustable valvetrain was the Boss, because it ran a solid-lifter cam. Your cam manufacturer's card will tell you when a grind calls for machined heads and adjustable rockers.
No — Cleveland and Windsor are very different engines despite sharing a displacement number. The deck heights are different, the cranks are different, the main and rod journals are different, and the cylinder heads are different right down to how the water flows from the block into the head and intake. There are spacer kits that let you swap intakes be
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