Information wanted on 265,283 HP ratings

General engine tech -- Drag Racing to Circle Track

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Truckedup
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Re: Information wanted on 265,283 HP ratings

Post by Truckedup »

Were the HP ratings on the 283-327 engines reasonably honest? I know they were gross power ratings ...
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Re: Information wanted on 265,283 HP ratings

Post by Ed Wright »

The'55 180 hp, and '56 205 hp had different heads. The '56 219 hp was the single 4 bl solid lifter Corvette engine, which was also available in the Chevy pass car as an option. Same engine as the Corvette 225 hp engine, except for the 2 4bls on the 225. I used to race one with the 225 hp Veteran engine option.
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Re: Information wanted on 265,283 HP ratings

Post by Ed Wright »

That would be the '56 210 hp, not 219.
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Re: Information wanted on 265,283 HP ratings

Post by fdicrasto »

GLHS60 wrote: Sun Nov 26, 2017 1:26 am 360 HP was 1962-63 and 375 HP was 1964-65.

Advertised compression ratio was reduced from 11.25 to 11.oo to 1 for the 375 HP.

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Oldhead, these are the correct specs as far as years and hp. Remember that in '65 chevy dropped the F.I. corvette option halfway through the year and replaced it with the 425 hp 396. That same engine was also available in the 65 Chevelle. Though basically the same as the 375 hp 396 in following years these were hand built with a few little tricks at the factory not advertised to many.
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Re: Information wanted on 265,283 HP ratings

Post by pdq67 »

I thought the 375hp/396 was turned into the 425hp/396 by installing the 'Vette/Big Car exhaust manifolds on it..

This is why I always wondered about installing the exhaust manifolds on a 1st. Gen. BB Camaro Car.

How far off am I??

And in actuality, both engines were really 410hp engines in real life...

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Re: Information wanted on 265,283 HP ratings

Post by fdicrasto »

We are getting away from the post a little but it was just the opposite on the 425-375 hp deal. The 425 hp was given to the 427 single 4 bbl special hp the following year and the special hp 396 went to 375 hp. A special few 66 chevelles with the 375 hp 396 had these one off "select" fitted and assembled engines as the 65 did and at the drag strip were quicker and faster then the other 375-396 chevelles.
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Re: Information wanted on 265,283 HP ratings

Post by pdq67 »

Sorry to get so far off topic, but this stuff is interesting to say the least!! And I dearly love the 3"-stroked SBC engines!!

Wasn't the, "still-born", LS7 454" engine like 600hp with no more than a good set of 4 tube, long tube, headers and an open exhaust?

And wasn't it a 454", 427" type, L-88 engine?

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Re: Information wanted on 265,283 HP ratings

Post by Old School »

Ed Wright wrote: Sun Nov 26, 2017 2:27 pm The'55 180 hp, and '56 205 hp had different heads. The '56 219 hp was the single 4 bl solid lifter Corvette engine, which was also available in the Chevy pass car as an option. Same engine as the Corvette 225 hp engine, except for the 2 4bls on the 225. I used to race one with the 225 hp Veteran engine option.
Does anyone know the .050 numbers for the 210/225 solid lifter 265 cam? I have a new one I had forgotten about until this thread.

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Re: Information wanted on 265,283 HP ratings

Post by pdq67 »

Old School wrote: Mon Nov 27, 2017 1:28 am
Ed Wright wrote: Sun Nov 26, 2017 2:27 pm The'55 180 hp, and '56 205 hp had different heads. The '56 219 hp was the single 4 bl solid lifter Corvette engine, which was also available in the Chevy pass car as an option. Same engine as the Corvette 225 hp engine, except for the 2 4bls on the 225. I used to race one with the 225 hp Veteran engine option.
Does anyone know the .050 numbers for the 210/225 solid lifter 265 cam? I have a new one I had forgotten about until this thread.

Thanks, Billy
I figure that it should be the 2nd cam in the 2nd post attachment list on the 1st page. I can barely read the list so please help yourself.

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Re: Information wanted on 265,283 HP ratings

Post by DaveMcLain »

Old School wrote: Mon Nov 27, 2017 1:28 am
Ed Wright wrote: Sun Nov 26, 2017 2:27 pm The'55 180 hp, and '56 205 hp had different heads. The '56 219 hp was the single 4 bl solid lifter Corvette engine, which was also available in the Chevy pass car as an option. Same engine as the Corvette 225 hp engine, except for the 2 4bls on the 225. I used to race one with the 225 hp Veteran engine option.
Does anyone know the .050 numbers for the 210/225 solid lifter 265 cam? I have a new one I had forgotten about until this thread.

Thanks, Billy
A few years ago I built a 265 for a '55 Chevy restoration and I plotted all of the lobes of the stock cam. In this case it was the hydraulic lifter version: About 175 at .050 intake and exhaust on a 107 lobe separation with .329 lift. i would assume that the solid lifter version would be very similar.
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Re: Information wanted on 265,283 HP ratings

Post by oldhead »

HOLD ON A MINUTE, As I read here, I did not know.........You are saying in 1956 there was a 2 barrel 16? hp,4 barrel 205 hp in pass. car......Corvette 4 bar. 210 HP,2-4 bar 225 hp.,2-4 bar. 097 cam and big port heads 240 hp......The 1955 corvette cam might have been in the 225............OLDHEAD
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Re: Information wanted on 265,283 HP ratings

Post by oldhead »

I still did not get a answer on 1963-64 360 HP FI difference to 1965 375 HP FI,Was if heads & 2.02 valves ?Oldhead
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Re: Information wanted on 265,283 HP ratings

Post by DaveMcLain »

As far as I know the 2.02 valves were only used in the highest horsepower engines such as the 375 horsepower but not the 350 horsepower. I think that was always the case with the 327 engine. I wonder when the change to the 462 head happened and maybe that ties in with a lowering of compression but a slight increase in HP? I have a customer who does Corvette restoration so he would probably know for sure.
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Re: Information wanted on 265,283 HP ratings

Post by Ed Wright »

The 1956 "Power Pack" single 4 barrel, hydraulic lifter engine that was available in any 1956 Chevy passenger car.
The 210 hp single 4 barrel Corvette engine was standard in the Corvette. Small solid lifter cam, dead smooth idle, valve lash was .008" & .018".
Sounded like a hydraulic, no valve train noise.
The 205 hp engine came with a Rochester 4GC in the Powerglide cars, a Carter WCFB in the stick cars.
The 210 hp all had the Carter WCFB. It was an option in all '56 Chevy passenger cars. I knew a guy with a '56 210 series 2 Dr hard top that bought it new that way. Also had OverDrive, which he said came with 4.10 gears?
The 225 hp Corvette engine had the same small solid lifter cam, and two slightly smaller Carter WCFB carbs.
There was a 245 hp Corvette engine option, which was the 225 hp with a cam sharing specs with the famous 097/098 "Duntov" cam. Only difference was the notch in the rear journal for lifter/rocker oiling. That was the one Jere Stahl ran in his rediculous fast '56 wagon.
I don't know for sure, but was told by a couple older guys that if you ordered the 245 hp Corvette, you got a 225 hp with the bigger cam in the trunk, to be installed by the dealer. Sounds strange, but they both swore it was true.
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Re: Information wanted on 265,283 HP ratings

Post by Krooser »

Back when I was a big GM guy I did new car setup at a Chevy shop in Milwaukee...drove the first Z28 to come off the truck in '67... Lost a race to a '66 SS 396 on the predelivery test drive!
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