New guy with a 66 SS - Impala Tech
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post #1 of 10 (permalink) Old 11-21-2010, 03:07 PM Thread Starter
 
 
Join Date: Nov 2010
Location: Pleasant Prairie WI
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New guy with a 66 SS

New guy here checking in here, im from wisconsin, but am right on the illinois wisconsin boarder, i am in the navy and currently working at the great lakes naval training station in the chicago area. i am going to be needing some help with building this car as far as questions and what not go and some advice as well. so here are a couple of my questions
first off is that i got my 1966 impala ss #'s matching, currently is what i believe to be a 327 275hp engine, the reason why i say believe is there is a 327 325hp air cleaner on the car, very possible its not the original air cleaner and from a different car, what are the ways i can tell if its the 275hp or 325hp engine? also what are the heads that came on the 275hp engine, i have a chance to pick up a set of 66 2.02 heads that need rebuilt for $100 maybe a little less and want to know how much of an improvement over the heads currently on the motor they would be.
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post #2 of 10 (permalink) Old 11-21-2010, 05:24 PM
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Engine

In 1966 the only 327 engine for the Full size was the 275HP one. The 325HP engine was a 396 Big Block that I am sure you would know from a 327 small block. As far as numbers matching you would have to post the casting numbers, etc.

Paul

Paul

1966 Impala SS

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post #3 of 10 (permalink) Old 11-21-2010, 06:17 PM
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Check this site, Should help ID your engine.
http://www.oldride.com/library/1966_...et_impala.html

http://www.impalas.net/forums/image.php?type=sigpic&userid=521&dateline=14693626  69
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post #4 of 10 (permalink) Old 11-21-2010, 06:26 PM
BA.
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welcome to the site Justin.

I don't think those other heads are going to help you out much. It would be marginal.

Aren't the heads that are on the car already the "camel hump" variety? (2 small humps on a raised pad at the end of the head)

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #5 of 10 (permalink) Old 11-21-2010, 06:30 PM
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Welcome to the Team Justin!

As an old (Veit Nam era) brown shoe I salute you.

A 275 horse engine was the base model of the 327. It had a flat tappet hydraulic cam (probably still does which is a problem because the oil industry pulled all of the additional metals out of motor oil in 2003 to prevent zinc and phosphate from poluting catalytic converters on new cars that all have roller tapets).

The heads were the base "Power Pack" head as first introduced back in 1958 (it has a triangle on top of a base rectangal). The only other head that Chevy cast one other head back in 1966 and it was the one that used on the 350 horse and 375 horse 327. They are the Fuelie heads and have two half round humps (called camel hump heads) sitting on top of the rectangular base. A lot of research and computer time that didn't even exist back in 1966 go into newer heads for your motor. A set of aftermarket heads will really wake up your engine as all power is in your head choice.

The flat tappet cam was used in all of the higher horse small block Chevys. The solid lifter is distiginuishable by ear as it clatters constantly at idle. You can hear the gap between the top of the valve and the rocker arm slaming shut as the valve starts to lift off it's seat. A solid cam is used in high horsepower applications as you only get to high horsepower (peak horsepower) by reving the motor beyond where the hydraulic tappet can go. Peak horsepower numbers are what the early NASCAR racers used to paint unto the hoods of their cars back when they actually used stock cars to race instead of tube chassis cars that are all identical except for the painted on body identification and numbers. Peak horsepower is great for racing the high oval bank at Daytona, it is next to useless for a street car that lives way down low in the potential RPM band allowed by the police (if you doubt this thry popping the clutch at 8,000 RPM when at a stop light some time). On the street torque rules. It is what allows you to accelerate quickly and merge and it all has to be available in an RPM range used in driving on the street (which for a five plus liter American V-8 would be from idle to 4,500 RPM).

The only other difference would be in the intake and carburation. All of the higher horse motors had four barrels (either a Rochester Quadrajet for the 275 300 and 325, and a Holley 4160 series on the 350 and 375 horse on the 1966 models) I do not believe any of the 327's had a two barrel in 1966, but I could been mistaken.

Big Dave
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post #6 of 10 (permalink) Old 11-21-2010, 07:26 PM Thread Starter
 
 
Join Date: Nov 2010
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so 325hp 327's werent available in 1966 unless special ordered? its a 4 barrel carb and its a holley but i will have to check on the series of the carb on it, not sure on that, all i know is im pretty sure it is going to end up having at 275hp motor in it, the motor is a 1966 motor but did have a 327 325hp air cleaner on it.
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post #7 of 10 (permalink) Old 11-21-2010, 08:27 PM
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My 582 BBC has a 402 decal on the air cleaner. Put it there myself. Costs $3.89 at most decal supply places, though usually it is guys who own a 402 sticking on a 454 decal.

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post #8 of 10 (permalink) Old 11-22-2010, 08:00 AM
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Engines:

You could not order a 327/325HP in a Full size. After the 327, the choices were a 396/325, 427/390 or 427/425HP.

The 396 air cleaner is very similar to the 327 with a shorter snout.

Paul

Paul

1966 Impala SS

Please Visit our new site:
http://www.winvoices.com/
1959 through 1988* window stickers, car shippers, dealer invoices, retail sales orders and tank stickers, expertly reproduced, for most Chevrolet Models.





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post #9 of 10 (permalink) Old 11-22-2010, 02:34 PM Thread Starter
 
 
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this air cleaner still has the decal on it and it says 327/325hp, so i guess its off of a different car, no big deal
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post #10 of 10 (permalink) Old 11-22-2010, 03:58 PM
Ape
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Yeah, you can get a 327 decal with anything from the 235 hp and up. My stock 327/235 had a 327/300 decal on it. It now has the stock one (235) back on as I am not into badging my car something that it isnt.

Make: Chevrolet
Model: Impala Custom
Year: 1969
Doors: 2
Engine: 327 V8
Trans: Powerglide

Last edited by Ape; 11-22-2010 at 07:59 PM.
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