1965 425 horse 396 - Page 2 - Chevelle Tech
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post #16 of 23 (permalink) Old Apr 30th, 16, 9:59 PM
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Re: 1965 425 horse 396

Ive actually seen several 65 409 Impalas the last 20 years I can remember. Both at local car shows, one was a car that was trailered into a swap meet needing restoration, appeared to be a barn find before that term was overused, that one was around 1994 or 95. Another one I remember was at the Car Craft Nats sometime around 2000 or 2001. Nicely restored factory stock restoration.

How did GM go from the 425HP L78 in 65 to the 375HP in 66. Did they change the cam?

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post #17 of 23 (permalink) Old Apr 30th, 16, 10:19 PM
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Re: 1965 425 horse 396

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Originally Posted by Chris R View Post

How did GM go from the 425HP L78 in 65 to the 375HP in 66. Did they change the cam?
Chevy had a habit of only changing what RPM that got the HP rating from. Plus your L72 Vette was first rated at 450 in 66 and then to 425. Can't have a Chevelle or Impala have more power then a Vette.

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post #18 of 23 (permalink) Old May 1st, 16, 9:47 AM
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Re: 1965 425 horse 396

Actually got to drive one
Guy I worked for back in the late 80s restore early vettes rare camaros etc. This thing came in he picked up was so original and complete it would make your teeth hurt. White/black buckets, sure it said 396 on the fender. Owner told me to start it up as I was asking if it twas for sale, was shocked. Sounded stout. If I didnt know better I could hear solid lifters in it very lumpy cam..4 spd. Wouldnt let anyone near it! Never knew what happened to it.

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post #19 of 23 (permalink) Old May 1st, 16, 1:54 PM
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Re: 1965 425 horse 396

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Originally Posted by keithb View Post
Chevy had a habit of only changing what RPM that got the HP rating from. Plus your L72 Vette was first rated at 450 in 66 and then to 425. Can't have a Chevelle or Impala have more power then a Vette.
Exhaust manifolds are different thus effecting power. Vette's had better exhaust.

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post #20 of 23 (permalink) Old May 1st, 16, 2:20 PM
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Re: 1965 425 horse 396

the 425 HP rating for 1965 396 was at 6400 rpm


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post #21 of 23 (permalink) Old May 1st, 16, 2:27 PM
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Re: 1965 425 horse 396

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Originally Posted by Chris R View Post
How did GM go from the 425HP L78 in 65 to the 375HP in 66. Did they change the cam?
It was all corporate politics as the 1966 L72 was originally rated at 450 H.P.

An AMA agreement stipulated that max. H.P. for passenger cars would be capped at 425 H.P.

So it's no coincidence that the 426 Hemi, 427 Ford Side Oiler and the Chevy L 72 were all rated at the exact same 425 H.P.

The L 72 H.P. rating was reduced to 425 and the L 78 reduced to 375, all on paper or air cleaner decals..

The 1965 Z16 Malibu, 375 H.P., 396, PRO L 37, was used only in the Z 16.

The main difference was it's use of a hydraulic cam, where the L 72 and L 78 were all solid lifter.

As Corvettes were sports cars, not regular passenger cars, they were allowed to exceed the 425 H.P. limit.

Obviously, the 1970 only LS6 Chevelle ignored the AMA agreement as it was the end on the era.

I refer to H.P. ratings of the day as a means of Engine identification, not a true representative of actual H.P.

Several Engines with lower ratings are more powerful than similar Engines with higher ratings.

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post #22 of 23 (permalink) Old May 1st, 16, 3:19 PM
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Re: 1965 425 horse 396

Didn't the 1965 Z16 chevelle used the same engine as the 425 hp 396 but rated it at 375 hp?
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post #23 of 23 (permalink) Old May 1st, 16, 3:25 PM
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Keith
 
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Re: 1965 425 horse 396

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Originally Posted by Ga69abody View Post
Didn't the 1965 Z16 chevelle used the same engine as the 425 hp 396 but rated it at 375 hp?
No.. The Corvette used solid lifters and was RPO L78 the Z16 was a non advertised RPO L37

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