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eauto, Classic Car Mechanic
Category: Classic Car
Satisfied Customers: 16040
Experience:  ase tech shop owner
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Chevrolet Impala SS: what is the difference between a 1963

Customer Question

what is the difference between a 1963 327cu 250hp and a 300hp
Submitted: 1 year ago.
Category: Classic Car
Expert:  eauto replied 1 year ago.

cam is different Spec difference is 250hp (L-30) had a WCFB or 4GC carb,
hydraulic lifters and 2" exhaust. 300hp (L-74) had an AFB
aluminum carb, mechanical lifters and 2 1/2" exhaust.

the 327 was offered in four different power ratings depending on the vehicle it was in. The base models produced through 1965 with four-barrel carburetors and a 10.5-to-1 compression ratio made 250 horsepower and 350 foot pounds of torque. Another version manufactured through 1968 featured a four-barrel carburetor and the same compression ratio, but produced 300 horsepower and 360 foot pounds of torque. The “performance” model of the 327 at the time also used a four-barrel carburetor, but bumped the compression up to 11.25 to 1 to produce 340 horsepower and 344 foot pounds of torque

Expert:  eauto replied 1 year ago.

PowerPaks to double hump heads also when you
go from 250 to 300hp.

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