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Tractor Talk Discussion Forum

Re: Impala in my driveway

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Author  [Modern View]

06-24-2013 05:31:58

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Not being critical...but my 1970 Motors manual does not list a 427 as being available in 1965. It was available in 1966. The most powerful 327 in 1965 is listed as 375 hp, the 409 had 400 hp.

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06-24-2013 07:38:19

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 Re: Impala in my driveway in reply to jimlll, 06-24-2013 05:31:58  
The 327/375 FI engine was always a Corvette only engine.

The highest HP 327 engine available in full sized Chevrolets in 65 was the 327/300, itself a sleeper as it was underrated.

Higher HP 327 engines produced HP at higher RPMs and were cammed to do so. Manifold vacuum was deemed unsuitable for vacuum accessories and low/mid range engine torque was unsuitable for automatic transmissions, most common in Impalas.

The 409 was sold in 1965 Chevrolets until January (February?) when the 396 became available. The 400 HP rating was the same as the HP (big head) 64 version with a single 650 CFM Carter AVS (AFB) carburetor. GM dropped the 2X4 (425 HP) option in 1964, though quite a few were retrofitted.


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06-24-2013 07:06:51

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 Re: Impala in my driveway in reply to jimlll, 06-24-2013 05:31:58  
Quoting Removed, click Modern View to see"A special 427 cubic inches (7.00 L) version of the 409 engine was used in the 1963 Chevrolet Impala Sport Coupe ordered under Chevrolet Regular Production Option (RPO) Z11."

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06-24-2013 07:29:57

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 Re: Impala in my driveway in reply to JMOR, 06-24-2013 07:06:51  
True but they have always been extremely rare..

No RPO Z11 409/427s were sold for street use.

GM pulled the plug on factory sponsored racing efforts as it was being developed. Fewer than 50 cars were built with the engine and sold to drag racing teams. Another 200 or so engines were sold across the parts counter.

In 1968 I bought a Z11 camshaft throught he parts department at the Chevrolet dealer where I worked for a friend of mine who put it in his 409/425. IIRC, it cost $24.**.


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06-24-2013 06:54:21

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 Re: Impala in my driveway in reply to jimlll, 06-24-2013 05:31:58  
Quoting Removed, click Modern View to see

It is my recollection that my impression at the time was that the 427 was not original to the car but was in it when he bought it two years old.

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