1962 409 vs 63 425
November 5th, 2022, 10:36 AM
#1
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1962 409 vs 63 425
Hello all
i am new to the 409 world
looking to purchase a 62 Impala with 409
I need to know the difference from a 409 hp to the 425 hp
what was changed
Numbers casting etc
Stamping on deck ?
I am asking because a seller has a late production 62 who thinks it could be a 425 hp
Block is a 068 with CFD on rear
any help is appreciated
thank you
i am new to the 409 world
looking to purchase a 62 Impala with 409
I need to know the difference from a 409 hp to the 425 hp
what was changed
Numbers casting etc
Stamping on deck ?
I am asking because a seller has a late production 62 who thinks it could be a 425 hp
Block is a 068 with CFD on rear
any help is appreciated
thank you
November 5th, 2022, 12:04 PM
#2
If the engine is original to the car the VIN number should be stamped on the pad on the passenger side front of the block next to the engine number. The suffix code was still QB. This upgrade was available as a service package in very late 62.
Last edited by david starr; November 5th, 2022 at 1:16 PM.
November 5th, 2022, 12:19 PM
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November 5th, 2022, 1:14 PM
#4
The 425 hp engine had a hotter cam, diffrent exhaust manifolds, and a single point distributer. This information is provided in Chevrolet By The Numbers 1960-1964 by Alan L. Colvin. These changes were offered as a service package in very late 1962.
Last edited by david starr; November 5th, 2022 at 1:18 PM.
November 5th, 2022, 2:44 PM
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