283 motor options - Impala Tech
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post #1 of 17 (permalink) Old 10-08-2010, 08:13 PM Thread Starter
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283 motor options

My grandfather always told me his '65 wasn't an SS but he got some kind of "performance package". Turns out it's just a 283 with block code GK.

Looks like this made a little extra hp with the 4B carb but were there any other differences from the standard package? Is it appropriate to call this a "Super Turbo-Fire" like in the late 50's?

Does anyone have any idea how many of these packages were sold?
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post #2 of 17 (permalink) Old 10-08-2010, 11:37 PM
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In 1965, the GK means Manual Transmission and 4-BBL carb on a 283. Rated at 220 HP. Not bad for a 283, considering 327's came in 250 or 300 HP.



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post #3 of 17 (permalink) Old 10-09-2010, 01:15 AM Thread Starter
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Right, I just wonder if the carb was the only difference. 25 extra HP sounds like a lot.
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post #4 of 17 (permalink) Old 10-09-2010, 08:22 PM
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Nope carb and manifold was the only difference. The carb was called a 4G because it was basically two 2GV two barrel carbs Siamesed together. It doubled the cfm rating of the original 2GV carb.

This package was called a "power Pack" and has a little triangle on the heads instead of the simple square that was used on the 265 and base model 283. The Power Pack head has been used on every motor since it was introduced (though now it is the base package with the "Fuelie" camel hump marked heads being the "hot" ticket after 1961).

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post #5 of 17 (permalink) Old 10-10-2010, 06:01 PM
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The option didn't really have an special name on documentation. On the window sticker, it appeared as L77 4-Barrel Carb at a cost of about $53.80

The production figures I have show L77 for 66 but don't show 65 production for some reason.

The GK code is actually more uncommon as it is for a manual trans car. Do you know what the specs of your grandfather's car were? Was is a 3spd or 4spd?

Most 220HP cars had a powerglide trans.

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post #6 of 17 (permalink) Old 10-10-2010, 11:24 PM Thread Starter
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It's a 3-spd column shifter with a manual overdrive (optional?). I have the car sitting in storage now. This is all very interesting, L77 seems to be the ONLY option my grandfather paid for. No SS trim or ac, manual brakes/steering but he paid $53.80 for the 4-barrel carb makes me laugh a little.

Sure wish I had known him better.

I know I'm not sitting on a treasure or anything but I am curious to find out how rare this combination was.
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post #7 of 17 (permalink) Old 10-11-2010, 06:15 AM
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I would say its kinda rare. 283 4 barrel carb and a manual 3 speed with overdrive. You don't see that very often. Have you checked to see what rear axle is under it? 10 or 12 bolt. Got any photos of the car?

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post #8 of 17 (permalink) Old 10-11-2010, 10:57 PM Thread Starter
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I posted a basic picture a while back in the welcome forum.

http://www.impalas.net/forums/attach...5&d=1279455132

No pics of the rear end yet, I will check this weekend. Do I just count the bolts? I know nothing about rear ends.

Is the manual overdrive standard with the 3-speed column shift or an add-on?
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post #9 of 17 (permalink) Old 10-12-2010, 12:49 AM
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That is really uncommon.

I was just talking with my father this afternoon about that combo. It would be interesting to see what the rear axle code is.

The overdrive was an option on top of the standard 3speed. So he ordered at least L77 and M10.

Do you have any original documentation from the car? Any option codes on the cowl tag?

Warren
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post #10 of 17 (permalink) Old 10-12-2010, 02:35 AM Thread Starter
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I will pull the cowl tag info and look at the axle this weekend.

Not 100% sure about documentation. I seem to remember seeing some paperwork but now it's in the glovebox with a stuck lock.

I have heard that my grandfather bought the car from the dealership he worked at. He was a mechanic in the service department so I'd bet he performed all the maintenance himself "off the books". Too bad the dealership has been out of business for at least two decades.

I'm loving this info guys, thanks a lot.
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post #11 of 17 (permalink) Old 10-12-2010, 05:40 AM
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That's a very nice looking 65. The 10 bolt rear would have been the standard rear axle with the 283 but you never know, I've seen several 283 cars with 12 bolts. One of my 4 door 283 parts cars has a 12 bolt under it.
And yea you just count the bolts holding the rear cover on.

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post #12 of 17 (permalink) Old 10-17-2010, 02:51 AM Thread Starter
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Here's the tag numbers.

05D
ST 65-16437 LOS21681
TR 811- Y-Y

Rear end is a 10-bolt. Did all 10-bolts come with the same gearing?

Finially got the glove box open but it was empty . The purchase information is most likely gone forever.
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post #13 of 17 (permalink) Old 10-17-2010, 09:44 AM
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Here is the breakdown:

05D - body built 5th week of May 1965.
65-16437 65 Impala sport coupe body
LOS 21681 21,681st 65 Impala Sport coupe body built at the Los Angeles, CA assembly plant
811- black cloth bench
Y-Y Yellow paint.

So there are no accessory codes on the cowl tag. It would have a 10 bolt rear. Most likely a 3:70, which you got with the overdrive.

There were other ratio 10 bolts used in 65 such as 3:08 and 3:36.

Warren
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post #14 of 17 (permalink) Old 10-24-2010, 10:17 PM Thread Starter
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Well, this is all great to finially know. Too bad the dealership is long gone.

Thanks everyone!
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post #15 of 17 (permalink) Old 10-25-2010, 10:37 AM
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Wow.. that's a pretty car! And it's a late '65, isn't it - being built in May?? Way cool!

'63 Impala Sedan
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post #16 of 17 (permalink) Old 10-25-2010, 04:33 PM
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Any small block built with modern heads and a modern cam grind can produce one horsepower per cubic inch (a feat that required a set of special fuelie heads, very special mechanical fuel injection, high compression pistons, and a solid cam back when these cars where new). and still have very decent street maners. In fact even at a level of about 1.25 horse from every cube it can still be street driven but you will not be able to pass it off as a stock motor. Of course modern aluminum heads unless disguised with some fancy CNC work and a little TIG welding not to mention a can of orange paint won't pass for stock either.

Performance of one horse per cube on what we used to think of as swill in terms of gasoline is the accepted norm now with aluminum heads and hydraulic roller cams. So if you want about 283 horse power you build a 292 (0.060" over 283 because odds are even a 0.030" bore is rare with a motor this old). You want 331 horsepower you build a 331 (a 0.030" overbored 327). If you want about 355 horsepower, you rebuild your 350 with higher compression 0.030" over slugs), but if you think about you really want a rebuilt SBC 402 because 406 to 425 horsepower out of a motor wearing 283 decals and the same tin and air cleaner, and for all the world being a 283 just makes more sense to me.

To quote old Charlie Chan "All you lound eyes rook arike to me!" when it comes to Chevy's small block they all look alike on the outside but can nearly double their displacement by choosing the right parts for the inside.

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post #17 of 17 (permalink) Old 10-26-2010, 03:07 PM
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Quote:
Originally Posted by danielwkade View Post
Well, this is all great to finially know. Too bad the dealership is long gone.

Thanks everyone!
What dealer was it sold at? How do you know? From a dealer emblem on the trunklid?

Warren
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