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Both engines use the same crankshaft and rods, but the piston on a 307 is the same diameter as a 283 (3.875"), and the piston on a 327 is the same diameter as a 350 (4.000"). In theory, the 307 would be very torquey for it's size, whereas the 327 would tend to make good power in the upper rpm range.

In actual practice, 307's were a low compression motor that produced reliable horsepower and good economy. The 327's had 10.5-1 compression and bigger valves to produce more horsepower and torque than had previously been produced in a small block chevy. High performance versions of the 327 were available in up to 375 horsepower with higher compression, solid lifter cam and bigger heads.

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Q: Other than hp what is the difference between a Chevy 307 and a Chevy 327 engine?
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