Q: What is a Pontiac 455 engine bored 40 over called?

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A 289 bored .030 over.

That would be called a Chevy 307 bored .40 over.

its called nothing because you wouldn't have a ENGINE left if you bored it 4" over

A 262 bored 30 over.

A 427 bored .60 over is 438.8572417 or basically a 439.

332

355

The bore diameter would be 4.195 and the stroke is 4.218. using the formula pi times the radius squared: 4.195/2=2.0975*2.0975=4.3995*3.14159*8*4.218=466.4 So, a 455 bored 40 over would be a 467

The bore adds about 10 cu. inches to make it a 337

332

Sounds like a 343 to me. But for parts its a 283 bored 60 over

A 350 bored 40 over is a automobile engine which has had its displacement increased to 383 cubic inches. This results in more power without needing to purchase a new engine.