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 Page 1 of 2 12
Username Post: Ok, what's a Power Pack?        (Topic#241268)
Topless57 
Contributor
Posts: 649
Topless57
Loc: Frankfort, Il.
Reg: 12-26-02
05-03-10 04:59 AM - Post#1908941    

I always thought it was a 4bbl carb. & dual exhaust. That was until yesterday, when a friend & I were looking at the shop manual, section 8, page 1. Refering to the different size gas tanks, it states in bold type, "except power package units, which have 20 gallon tanks." Since most tanks are 16 gallons, does this mean that only dual quads or fuel injected cars are considered power packs? Does Chevy define what a power pack is anywhere? This is important, because I lost a beer on this one!

Jack
www.picturetrail.com/topless57


 
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johnonetrillion 
Member
Posts: 200

Loc: Australia
Reg: 01-20-05
05-03-10 05:58 AM - Post#1908966    
    In response to Topless57

I think you should get that beer back.

Powerpack was an option available with 4 barrel carb. I think they called it 'Super Turbo-Fire'. It always had dual exhaust and different heads (different chamber and valves?), marked with a triangle shape in the casting. Same was available with dual 4 barrel.

Not sure what heads came with the fuel injected versions?

Btw, what was it about the 270 hp dual 4 models that gave the extra horsepower over the 245 hp dual 4 models?

Don't know anything about different gas tanks, except for wagons.
1957 RHD Belair 2 Door Hardtop – under restoration
1960/61 Corvette – needs everything except carburetor

Melbourne, Australia


 
62chevy427 
"8th Year" Silver Supporting Member
Posts: 1756
62chevy427
Loc: laurens sc
Reg: 04-13-06
05-03-10 07:00 AM - Post#1909000    
    In response to johnonetrillion

i think they had a bigger cam.
56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
14 camaro (new)


 
DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
05-03-10 10:32 AM - Post#1909155    
    In response to johnonetrillion

The 245hp and 270 hp engines were 2x4 engines.
The 250hp and 283hp engines were FI engines.
The higher output versions had the solid lifter camshaft, commonly referred to by all knowledgeable Chevy folks as the "097" cam (last three numbers of the part number).
The lower power versions had the stock hyd cam.
ONLY the FI engines got domed (or commonly called pop-up) pistons. all other engines had flat top pistons.
ALLLLLLL heads had 1.72/1.5 valves.
In the 57 pass cars, there were a total of seven V8 engines:
265 2bl
283 2bl
283 4bl (commonly known as the power pac engine)
283 2x4 (hyd cam)
283 2x4 (solid cam)
283 FI (hyd cam)
283 FI (solid cam).

The 57 Vettes DID NOT get the 265 or the 283 2bl.

The top rated 57 283 was 283hp with FI and the 097 cam. BUUUUUUUUUUUUUUT, during CEC (Chevrolet Engineering Center) tests, the 283/283 FI engine developed a true 293hp!!!! This rating was downplayed SPECIFICALLY for advertising/promotional purposes so that Chevy could tout One Horsepower per Cubic Inch! the 58-59 solid lifter FI engines (which were virtually identical to the 57 engine) were rated at 290hp.
Tom Parsons


 
johnonetrillion 
Member
Posts: 200

Loc: Australia
Reg: 01-20-05
05-03-10 02:59 PM - Post#1909303    
    In response to DZAUTO

Tom, which of the configurations you listed used the Power Pack cast heads – with the triangle marker?
1957 RHD Belair 2 Door Hardtop – under restoration
1960/61 Corvette – needs everything except carburetor

Melbourne, Australia


 
57CW 
Contributor
Posts: 242
57CW
Reg: 05-25-08
05-03-10 03:33 PM - Post#1909313    
    In response to johnonetrillion

I have the 283 4bbl with the rectangle/triangle top front markings on the heads known as power pak, the engine is rated at 220hp 9 to 1 comp and in my 1957 Chevrolet Dealer catalog is called a Super Turbo Fire Power Pak V8, the 283 2bbl was call the Turbo Fire V8 and had a 8 to 1 comp ratio. This is what it says and what I have seen in the specs ratings.
Jack-57CW

1957 Chevrolet 210 Townsman wagon
57EM - ELECTRIC MISTRESS


 
DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
05-03-10 03:51 PM - Post#1909321    
    In response to johnonetrillion

  • johnonetrillion Said:
Tom, which of the configurations you listed used the Power Pack cast heads – with the triangle marker?



John,
The 1x4bl engine (Power Pack) and the 283hp FI engine (solid lifter cam) got the triangle (or pyramid as we call them) symbols.
Tom Parsons


 
CJS57 
Frequent Contributor
Posts: 2461
CJS57
Age: 68
Loc: New Milford , Connecticut
Reg: 01-18-05
05-04-10 03:38 AM - Post#1909581    
    In response to DZAUTO

To add to Tom's info on the head markings, the 245hp, 250hp, 270hp, all came with the "single post" marking head called the "997" head. The 185hp 2 barrel 283 had just a flat top pad, to upper marking on its heads.
1957 Belair 2Dr Hdtp, 58,000 original miles, original never rebuilt 283 engine, 245hp, Dual Fours, Tremec TKO 600 5-speed, 3.70 gears, AACA Senior in 1985
previous trifives:
1955 Belair Convt
1956 210 2dr Sdn
1957 Belair 2Dr Hdtp


 
Richard Martin 
Dedicated Enthusiast
Posts: 5065

Loc: Davis Islands, Florida
Reg: 06-12-03
05-04-10 04:41 AM - Post#1909607    
    In response to CJS57

I did not know, until recently, the 1957 283/220 passenger car engine and the 283/220 Corvette engine are not the same.

From Corvette service manual:

"The Corvette engine differs from the 220 hp passenger car engine in that the main and connecting rod bearings are of special material, Moraine 400. These bearings are used in all Corvette engines."

"The 220 hp Corvette engine also differs from the 220 hp passenger car engine in the piston rings. The top compression and the oil control ring on the passenger car are chrome-flashed to produce a coating approximately .0005" thick. On the Corvette, the chrome plate on these rings is approximately .004" thick. These rings are used on all Corvette engines."

"The engine oil pan on all Corvette engines is of a five quart capacity, 1 quart more than convential passenger car V-8 engines."

"The pistons used on all Corvette engines with the exception of the 283 hp fuel injection engine, are of a notched type, with cut away areas to insure valve clearance. The passenger car 220 hp engine is equipped with flat pistons."

Richard

 
Gene_Schneider 
Ultra Senior Member
Posts: 10878

Loc: Wisconsin..USA
Reg: 09-27-02
05-04-10 07:08 PM - Post#1910003    
    In response to Richard Martin

No stock 1957's had a 20 gallon tank. All sedans had a 16 Gal tank and that was an error.
There was a special 20 Gal tank available for racing.
ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
Gene_Schneider 
Ultra Senior Member
Posts: 10878

Loc: Wisconsin..USA
Reg: 09-27-02
05-04-10 07:11 PM - Post#1910007    
    In response to Richard Martin

The Power Pac cars did not have notched pistons. As a result when the engine was over-reved thru the gears the valves would float and hit the pistons. The keepers would fall off, valve drop in and throw a rod. The replacement blocks and 1958 engines all had notched pistons.
ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
Topless57 
Contributor
Posts: 649
Topless57
Loc: Frankfort, Il.
Reg: 12-26-02
05-04-10 07:41 PM - Post#1910029    
    In response to Gene_Schneider

Thanks Gene, I think I just got my beer back.

Jack
www.picturetrail.com/topless57


 
57CW 
Contributor
Posts: 242
57CW
Reg: 05-25-08
05-04-10 09:53 PM - Post#1910095    
    In response to Topless57

Hey Jack, glad you got your beer back.

Gene is spot on, great info from him. Yeah, the gas tanks have nothing to do with power pak as you found out, that's the reason for explaining where the name came from, btw, my wagon has a 17 gallon tank.
Jack-57CW

1957 Chevrolet 210 Townsman wagon
57EM - ELECTRIC MISTRESS


 
DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
05-05-10 05:33 AM - Post#1910181    
    In response to 57CW

  • 57CW Said:
Hey Jack, glad you got your beer back.

Gene is spot on, great info from him. Yeah, the gas tanks have nothing to do with power pak as you found out, that's the reason for explaining where the name came from, btw, my wagon has a 17 gallon tank.




And my 51 Chevy has its stock, original 16gal tank.
Tom Parsons


 
OldDad 
Senior Member
Posts: 1921
OldDad
Age: 70
Loc: The Great NorthWest
Reg: 06-06-04
05-06-10 09:56 PM - Post#1911134    
    In response to DZAUTO

But Tom does it have the optional vacuum ashtray?
The S.O.B. from the factory...
71 1/2 ton, 64 Chevelle SS, 57 2dr Hardtop, 57 2dr Sedan, 57 Corvette, 52 2dr Hardtop, 52 2dr Sedan, and now a 49 Plymouth Coupe


 
DZAUTO 
Dedicated Enthusiast
Posts: 7477

Loc: Mustang, OK, USA
Reg: 12-25-99
05-07-10 01:05 PM - Post#1911397    
    In response to OldDad

  • OldDad Said:
But Tom does it have the optional vacuum ashtray?




No, but it does have the vacuum operated warning whistle for the emergency brake!
It's supposed to whistle to warn the driver when the em brake is not released. The Key word is SUPPOSED!
Tom Parsons


 
oldthudman 
Forum Newbie
Posts: 4
oldthudman
Loc: Texas
Reg: 07-08-12
07-08-12 08:06 AM - Post#2245673    
    In response to johnonetrillion

No, the 283/power pack did not "always" come equipped with dual exhaust............In 1961 I bought my first car, a 61 Impala hardtop (pillarless coupe today) with a 283 w/4 barrel carb(it was definitely a 4 barrel carb.).3 speed column shift and no power anything...It did not have duals....I added those in about 63 or 64....As to the heads, I assume that's true....Unfortunately a definitive definition of Chevy's "power pack" seems to be unavailable....At least online.....
My little 61 would get up and scoot-70 and 80 mph was easy..Numerous times I traveled from Vegas to Texas.....She was painted Twilight Turquoise top/bottom.....I put on Firestone 500's w/white walls(common then), dual exhaust w/glaspacks, Lucas "flame thrower" 5 1/2" lights in the high beams, & heavy duty shocks.....After I got out of the USAF I traded it of on a 66, to which I regret to this day........
This site does have some specs:
http://www.carnut.com/specs/gen/chv61.html




Edited by oldthudman on 07-08-12 08:12 AM. Reason for edit: No reason given.

 
Richard Martin 
Dedicated Enthusiast
Posts: 5065

Loc: Davis Islands, Florida
Reg: 06-12-03
07-08-12 10:38 AM - Post#2245710    
    In response to oldthudman

The 1958-1961 passenger car RPO 410 Super Turbo-Fire 4-bbl. carb 230 horsepower 283 a/k/a "Power Pack" engine came standard (except Corvettes) with single exhaust. Dual Exhaust, RPO 220, was an option. The dual exhaust option was also available for the base 2-bbl 283. Here is the exhaust info on the '59 base 283 and 283/230:
http://oldcarbrochures.com/static/NA/Chevrolet/1 95...

Richard

 
MikeB 
Senior Member
Posts: 9473
MikeB
Loc: Plano, TX
Reg: 08-28-03
07-11-12 01:30 PM - Post#2247092    
    In response to DZAUTO

  • DZAUTO Said:

In the 57 pass cars, there were a total of seven V8 engines:
265 2bl
283 2bl
283 4bl (commonly known as the power pac engine)
283 2x4 (hyd cam)
283 2x4 (solid cam)
283 FI (hyd cam)
283 FI (solid cam).



I had a 57 210 sedan back in the mid-60s that came from the factory with a 265. However, I've been called "crazy" more than once when I say 57 Chevy and 265 in the same sentence. Do you know if the 265 block had a full-flow oil filter? I can't remember, because I replaced it with a 58 283 shortly after I bought it.

Interesting info in the 2 posts above this. I had always thought that any 50s-60s Chevy V-8 with 4bbl carb had dual exhausts as standard equipment. I wonder what the duals did for horsepower? And were the single exhaust pipe and muffler any larger that what was used for duals?

Mike
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



Edited by MikeB on 07-11-12 01:36 PM. Reason for edit: No reason given.

 
ThumperNZ 
Contributor
Posts: 536
ThumperNZ
Loc: New Plymouth, New Zealand
Reg: 07-08-07
07-11-12 02:16 PM - Post#2247101    
    In response to MikeB

  • MikeB Said:
  • DZAUTO Said:

In the 57 pass cars, there were a total of seven V8 engines:
265 2bl
283 2bl
283 4bl (commonly known as the power pac engine)
283 2x4 (hyd cam)
283 2x4 (solid cam)
283 FI (hyd cam)
283 FI (solid cam).



I had a 57 210 sedan back in the mid-60s that came from the factory with a 265. However, I've been called "crazy" more than once when I say 57 Chevy and 265 in the same sentence. Do you know if the 265 block had a full-flow oil filter? I can't remember, because I replaced it with a 58 283 shortly after I bought it.

Interesting info in the 2 posts above this. I had always thought that any 50s-60s Chevy V-8 with 4bbl carb had dual exhausts as standard equipment. I wonder what the duals did for horsepower? And were the single exhaust pipe and muffler any larger that what was used for duals?

Mike



The 57 265 used the same block casting as the 283 but with an 1/8" smaller bore. They are desirable to get hold of now, in that they can be bored to std 283 size. They had the same oil filter as the 283.
'57 Model 1037D COMPLETED! (but are they really?


 
oldthudman 
Forum Newbie
Posts: 4
oldthudman
Loc: Texas
Reg: 07-08-12
03-20-13 10:55 AM - Post#2328002    
    In response to Topless57

It's amazing how little real concrete info exist (at least online) regarding the "power Pack 283ci Chevy engine....I had a 1961 Impala 2 dr HT or bubble top...Bought it at Courtesy Chevrolet (IIRC) in 61...Was Twilight Turquoise overall, had a 283/4bl, 3 speed on the column, and single exhaust....According to chart below the 283 4 bl was rated at 230hp.....While in the USAF I had dual's installed which should have upped the hp (16.8%-http://www.raptorforum.com/forums/archive/index.php/t-53175.html) to at least (rough guess)250hp-268hp
http://www.carnut.com/specs/gen/chv61.html

The only info I've been able to gleam from the net is the power pack had 4bl carb and different heads...What was different about the heads, no idea....Perhaps some Chevy book maybe be more forthcoming, so I'll keep looking......

HTH..

 
f.i.57chevynut 
Frequent Contributor
Posts: 1400
f.i.57chevynut
Loc: Granada Hills, CA
Reg: 03-04-09
03-20-13 10:38 PM - Post#2328144    
    In response to oldthudman

The '57 2 barrel heads had about 70 cc combustion chambers, 8 1/2:1 compression ratio with flattop no-notch pistons. The '57 powerpack heads have about 60 cc combustion chambers, rated at 9 1/2:1 with flattop no-notch pistons. All '58 and later flattop pistons had 4 notch pistons and lowered the compression ratio 1/4 of a point.

"The pistons used on all Corvette engines with the exception of the 283 hp fuel injection engine, are of a notched type, with cut away areas to insure valve clearance. The passenger car 220 hp engine is equipped with flat pistons."

The Corvette 220hp also used 997 heads to maintain the 9 1/2:1 compression ratio with the 4 notch pistons.

The 20 gallon tank was also used for taxi cabs and Police.

Tom Ordway tom@57chevys.com If you don't drive it, why have it?
http://www.americantorque.com/page/0/139/


 
Richard Martin 
Dedicated Enthusiast
Posts: 5065

Loc: Davis Islands, Florida
Reg: 06-12-03
03-21-13 06:03 AM - Post#2328192    
    In response to oldthudman

  • oldthudman Said:
It's amazing how little real concrete info exist (at least online) regarding the "power Pack 283ci Chevy engine....I had a 1961 Impala 2 dr HT or bubble top...Bought it at Courtesy Chevrolet (IIRC) in 61...Was Twilight Turquoise overall, had a 283/4bl, 3 speed on the column, and single exhaust....According to chart below the 283 4 bl was rated at 230hp.....While in the USAF I had dual's installed which should have upped the hp (16.8%-http://www.raptorforum.com/forums/archive/index.php/t-53175.html) to at least (rough guess)250hp-268hp
http://www.carnut.com/specs/gen/chv61.html

The only info I've been able to gleam from the net is the power pack had 4bl carb and different heads...What was different about the heads, no idea....Perhaps some Chevy book maybe be more forthcoming, so I'll keep looking......

HTH..



"What was different about the heads, no idea,,,"

The Super Turbo-Fire ("power pack") 4-bbl carb cylinder heads had smaller combustion chambers that raised the compression ratio from the base 2-bbl carb 283 engine's compression ratio of 8.5:1 to a ratio of 9.5:1 with premium fuel recommended.

Chevrolet tested the engines on a engine stand/ dynamometer with optimum spark advance and fuel setting but with no fan, generator charging or car street type exhaust system. Installed in a car the advertised (key word-"advertised") 230 @ 4800 gross rating actually dropped to a net rating of 175 horsepower. This means adding a dual exhaust system to your car would not raise the horsepower rating of the Super Turbo-Fire 283 above 230 because it really didn't have 230 horsepower when installed in the car.

btw dual exhaust was a factory installed option on the '61 passenger car 283, RPO 220, at a retail price of $24.75

The same 283/230 (except for premium bearings) was the base/standard engine for the '61 Corvette and it came standard with an efficient dual exhaust system---still had a advertised gross power rating of 230.

dyno info is from actual 1961 Chevy dyno tests shown in the '61 Chevy Heritage website

1961 big-Chevy brochure:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

1961 Corvette:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

Richard


 
YOUNG57 
Contributor
Posts: 577

Loc: Franklin TN
Reg: 12-06-10
03-21-13 01:17 PM - Post#2328309    
    In response to Richard Martin

I found the GM V-12 diesel engines used in WW-II Navy LST landing craft called the 4 valve cinder heads Power Packs.

 
oldthudman 
Forum Newbie
Posts: 4
oldthudman
Loc: Texas
Reg: 07-08-12
05-28-13 01:05 PM - Post#2349723    
    In response to Richard Martin

  • Richard Martin Said:
  • oldthudman Said:
It's amazing how little real concrete info exist (at least online) regarding the "power Pack 283ci Chevy engine....I had a 1961 Impala 2 dr HT or bubble top...Bought it at Courtesy Chevrolet (IIRC) in 61...Was Twilight Turquoise overall, had a 283/4bl, 3 speed on the column, and single exhaust....According to chart below the 283 4 bl was rated at 230hp.....While in the USAF I had dual's installed which should have upped the hp (16.8%-http://www.raptorforum.com/forums/archive/index.php/t-53175.html) to at least (rough guess)250hp-268hp
http://www.carnut.com/specs/gen/chv61.html

The only info I've been able to gleam from the net is the power pack had 4bl carb and different heads...What was different about the heads, no idea....Perhaps some Chevy book maybe be more forthcoming, so I'll keep looking......

HTH..



"What was different about the heads, no idea,,,"

The Super Turbo-Fire ("power pack") 4-bbl carb cylinder heads had smaller combustion chambers that raised the compression ratio from the base 2-bbl carb 283 engine's compression ratio of 8.5:1 to a ratio of 9.5:1 with premium fuel recommended.

Chevrolet tested the engines on a engine stand/ dynamometer with optimum spark advance and fuel setting but with no fan, generator charging or car street type exhaust system. Installed in a car the advertised (key word-"advertised") 230 @ 4800 gross rating actually dropped to a net rating of 175 horsepower. This means adding a dual exhaust system to your car would not raise the horsepower rating of the Super Turbo-Fire 283 above 230 because it really didn't have 230 horsepower when installed in the car.

btw dual exhaust was a factory installed option on the '61 passenger car 283, RPO 220, at a retail price of $24.75

The same 283/230 (except for premium bearings) was the base/standard engine for the '61 Corvette and it came standard with an efficient dual exhaust system---still had a advertised gross power rating of 230.

dyno info is from actual 1961 Chevy dyno tests shown in the '61 Chevy Heritage website

1961 big-Chevy brochure:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

1961 Corvette:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

Richard





Which engines did GM/Chevrolet dyno......2 brl, 4 brl?......Please post your written source of this testing.....

 
Richard Martin 
Dedicated Enthusiast
Posts: 5065

Loc: Davis Islands, Florida
Reg: 06-12-03
05-28-13 03:13 PM - Post#2349766    
    In response to oldthudman

"2 brl, 4 brl?"

both

GM Heritage Website---website may take a few seconds to load. Then click on blue down arrow at top of page to start...scroll down to dyno tests.

http://www.gmheritagecenter.com/docs/gm-heritage-a...

Richard

 
56sedandelivery 
Valued Contributor
Posts: 3279

Age: 62
Loc: Everett, Wa.
Reg: 02-26-08
05-28-13 10:28 PM - Post#2349905    
    In response to Richard Martin

Well, since we're on the subject of "Power Pack" heads and such, I'm hoping someone (Rick L/f.i.57chevynut//DZAUTO-Tom) can take an "edumacated" guess at my collage of parts, as far as the C.R. goes. 283 block taken to .030 over, flat top pistons with TWO valve reliefs ONLY, and I'm using the #5603 "Power Pack" 1956 heads that have just a clean-up cut on the heads surface. My "guess" is somewhere around 10.0:1. The block has also had a clean-up cut to the decks. I plan on a steel shim head gasket, and have actually found a couple pair of NOS, DEDICATED 283 head gaskets! This is my Pseudo-Junior Stocker engine (I know, but I could't find a good 265 block) I'm building, along with an aluminum Glide/4500 R.P.M. stall converter, and 4.88 or 5.13 gears. Probably be a single 4 barrel, but I do have two of the early 56 dual quad setups (incorrect carbs however). Or I may just use my "spare" 327/Super T-10 4 speed combination; it would be a lot more fun. Butch/56sedandelivery.



Edited by 56sedandelivery on 05-28-13 10:34 PM. Reason for edit: No reason given.

 
Highlander1 
"3rd Year" Silver Supporting Member
Posts: 1404

Loc: SE North Carolina
Reg: 08-19-04
05-28-13 11:07 PM - Post#2349908    
    In response to 56sedandelivery

Richard, what were the differences between the 220 HP engine and the 230 HP engine?

Was it someting like the 57 283 HP engine and the 58 and later 290 HP engine -- nothing other than factory ink? Thanks, Don

 
Richard Martin 
Dedicated Enthusiast
Posts: 5065

Loc: Davis Islands, Florida
Reg: 06-12-03
05-29-13 03:30 AM - Post#2349916    
    In response to Highlander1

  • Highlander1 Said:
Richard, what were the differences between the 220 HP engine and the 230 HP engine?

Was it someting like the 57 283 HP engine and the 58 and later 290 HP engine -- nothing other than factory ink? Thanks, Don



"nothing more than factory ink?"

Probably

The 4-bbl. carb. 283/230 disappeared in 1962 with the release of the 327 engines. Then it showed up again in 1964 as an optional engine for the new 1964 Chevelle with a 220 horsepower rating.

Early 1964 Chevelle engines:
http://www.lov2xlr8.no/brochures/chevy/64chev elle/...

The 283/220 became available again in the full-size Chevrolet around Feb. 1965 and lasted thru the 1966 model year and then disappeared again.

1966 engines:
http://www.oldcarbrochures.com/static/NA/Chevrolet...

Chevrolet and other car manufactures have always played around with horsepower ratings most likely for marketing reasons and bragging rites. For example the 1960 "top dog" hi-performance FH code 348 engine was rated a 335 horsepower. For the 1961 model year Chevrolet bumped the rating up to 350 horsepower. Why?....probably because the '61 Fords had a new 375 horsepower 390 engine and compared to 375 horsepower 350 sounds a lot better than 335 horsepower. High horsepower ratings are important to car owners too. Guys that have a '60 with the FH 348 claim a 350 horsepower engine. They get all upset if you tell them it was actually rated at 335 horsepower in 1960.

1960 348 engines:
http://www.60impala.com/pictures/chevy852/368 6.htm

Richard


 
raycow 
Honored Member
Posts: 17969

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
05-29-13 07:15 AM - Post#2349956    
    In response to Richard Martin

  • Richard Martin Said:
Chevrolet and other car manufactures have always played around with horsepower ratings most likely for marketing reasons and bragging rites. For example the 1960 "top dog" hi-performance FH code 348 engine was rated a 335 horsepower. For the 1961 model year Chevrolet bumped the rating up to 350 horsepower. Why?....probably because the '61 Fords had a new 375 horsepower 390 engine and compared to 375 horsepower 350 sounds a lot better than 335 horsepower. High horsepower ratings are important to car owners too. Guys that have a '60 with the FH 348 claim a 350 horsepower engine. They get all upset if you tell them it was actually rated at 335 horsepower in 1960.



All very true, but later on the car mfrs started UNDERSTATING the hp of their max performance engines, like the 290 hp 302 Camaro. Was this done for insurance reasons, or did it have something to with the competition rules?

Ray
I promised to serve you. I didn't say to whom.


 
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