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NOV 10, 2026 · 4 min read

Flat-plane vs cross-plane crank: why some V8s scream

Cutaway of the flat-plane crank LT6 V8 from the 2023 Corvette Z06, on display at the 2022 New York International Auto Show
Photo: Mr.choppers

Ford's 5.0 Coyote and the Shelby GT350's 5.2 Voodoo are both Ford V8s. One has the deep muscle-car rumble, the other howls to 8,250 rpm, and a big part of the reason is the shape of one part: the crankshaft.

The short answer

A cross-plane crank sets its four throws 90 degrees apart. A flat-plane crank sets them 180 degrees apart, all in one plane. Flat-plane V8s breathe better, rev higher and sound like a tenor. Cross-plane V8s shake less and give you the classic rumble, and most V8s use one.

What is the difference between a flat-plane and a cross-plane crank?

Look down the end of a cross-plane crank and the throws form a cross, one every 90 degrees. On a flat-plane crank they all sit in a single flat line, 180 degrees apart.

That one change sets the firing order. A flat-plane V8 always fires the banks in turn: left, right, left, right. A cross-plane V8 fires two cylinders on the same bank back to back at points in its order.

Why does a flat-plane V8 rev higher?

It comes down to the exhaust. With the banks taking turns, each side's pulses leave evenly spaced and travel down the pipes one at a time. The low pressure behind each pulse helps pull spent gas out of the next cylinder.

In a cross-plane V8, pulses from back-to-back cylinders on one bank can collide and push pressure back toward the next cylinder. Better breathing is what lets a flat-plane engine rev higher and make more power up top.

Why don't all V8s use a flat-plane crank?

Vibration. A flat-plane V8 shakes more than a cross-plane. Its secondary forces, the ones that act twice per crank turn, add up to a strong side-to-side shake.

A cross-plane V8 uses counterweights on the crank to reach near-perfect primary balance. Its even firing intervals also give steady torque through the rev range. For a road car that rarely sees redline, we think that smoothness is a fair trade.

Which cars use a flat-plane crank?

Race engines and serious sports cars, mostly. Ferrari's SF90 uses one, and so did the 2016 to 2020 Shelby GT350. Chevrolet's current Corvette Z06 and ZR1 do too. Here is how they line up against a cross-plane Mustang, with power as each maker rates it:

CarEngineCrankHorsepowerRedline
2025 Ford Mustang GT5.0 V8Cross-plane480not listed by Ford
2019 Ford Shelby GT3505.2 V8Flat-plane5268,250 rpm
2027 Chevrolet Corvette Z065.5 V8Flat-plane6708,600 rpm
2027 Chevrolet Corvette ZR15.5 twin-turbo V8Flat-plane1,0648,000 rpm

The Mustang GT makes its peak power at 7,150 rpm. The Z06's LT6 has made its peak at 8,400 rpm since it arrived in the 2023 Z06, and GM's engineers say they set out to build a flat-plane V8 that could spin close to 9,000. Ford calls the GT350's engine the highest-revving production V8 it has ever built.

On the street

You hear it before you see it. A cross-plane V8 has the bass rumble of a traditional American V8. A flat-plane V8 has a higher-pitched, tenor sound.

At a car meet, a GT350 next to a Mustang GT is the easiest side-by-side you will find: same badge, two very different noises. More on what makes engines different: turbo vs supercharger and dual-clutch vs manual.

FAQ

Is a flat-plane crank better?

For high revs and power at the top, yes. For less vibration and steady torque through the rev range, the cross-plane wins.

Why does a flat-plane V8 sound so different?

Because each bank fires in strict turns, the exhaust pulses come out evenly, which gives a higher-pitched tenor instead of the bass rumble.

Does the Ford Coyote have a flat-plane crank?

No. The 5.0 Coyote has a cross-plane crank, like most American V8s. Ford gave the 5.2 Voodoo a flat-plane crank instead.

Is the Corvette ZR1 flat-plane too?

Yes. Its twin-turbo LT7 uses the same flat-plane design as the Z06's LT6, with 1,064 hp and 828 lb-ft.

Sources