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Re: 352 Crankshaft
#61
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John Wallis
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Quote:

Jack Vines wrote:
Quote:
Were PRODUCTION built golden hawk 56J's with Packard V8 all have forged cranks????
Other than a better bottom plate for the oil pump without the vacuum pump, the '56J was in every respect a standard 1956 275hp 352" with a cast steel crank.

To date, I've never seen a production engine which could be verified as having been built with a forged crankshaft. Until we get something different in print from the factory, the 1959 date for introduction of the forged crank as a service part is still the one I believe.

jack vines



I would agree with Jack. I have a late production 374 Service Long Block/Crate Motor with a cast crankshaft and a bellhousing casting date of 7/26/56 that was in a 1956 GH (obviously a replacement motor). The production date would indicate it was manufactured after the 56J and 56 Packard Seniors were out of production and SP had moved on to the 1957 model year cars.

Posted on: 2012/2/26 14:30
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Re: 352 Crankshaft
#62
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Owen_Dyneto
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Some new (to me, at least) information on the Packard 55/56 cast steel crankshafts has come to light via a June 15, 1955 article from Automotive Industries and republished in Mid-America Packard's newsletter "The Data Plate", (Vol. 30, No. 4). Get your hands on a copy if you are interested, and I've asked permission to post the article on the PAC forum.

With Packard's sale of their Harper Ave forge and foundry in 1954, they apparently contracted for raw steel crankshaft castings with Auto Specialities Mfg. Co.'s Riverside Division Foundry which had a long history of casting crankshafts though primarily for smaller engines. The article describes a novel pattern and casting box method. At this point in 1955 only Packard & Ford Motor Co. were using cast steel crankshafts, though within a few years Chrysler joined the trend and thereafter it apparently became the norm.

I believe finish machining on the castings was done by Packard at Utica as I believe I've seen photos of that operation.

Posted on: 2012/4/26 9:50
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Re: 352 Crankshaft
#63
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R H
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I have a forged crank also, had it built up to STD and chrome harden

rik

Posted on: 2012/5/17 20:56
Riki
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Re: 352 Crankshaft
#64
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R H
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here is my forged crank

someone know the numbers?

will trade for a beat up rusted out 56 carib.........convert............


crank is chrome harden

i should of put the year on tag, but this was a few years ago,,maybe 2008

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Posted on: 2014/1/4 16:59
Riki
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Re: 352 Crankshaft
#65
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Jack Vines
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Riki, could you weight it for us?

jack

Posted on: 2014/1/4 19:41
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Re: 352 Crankshaft
#66
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R H
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no problem, but don't know how good my scale is,..

Posted on: 2014/1/4 21:32
Riki
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Re: 352 Crankshaft
#67
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R H
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jack, went out and scaled up to dig,,,

first number i got was 64.2,,then others were 64.4,,

and this sob, only showed for a second ,,so getting a picture was a trick,,,,,,,

wanted the shaft showing,

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Posted on: 2014/1/5 1:28
Riki
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Re: 352 Crankshaft
#68
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Jack Vines
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Cast crankshaft - 56#

Forged crankshaft - 64#

So, eight pounds more for the solid rod journals and possibly different counterweights.

One comparison I've never done is to photograph and measure the forged and cast counterweights side by side to document any differences.

Who has clean examples of each and will undertake this for the good of the order?

jack vines

Posted on: 2014/1/5 12:50
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Re: 352 Crankshaft
#69
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R H
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jack i do have cast cranks,

Posted on: 2014/1/5 15:01
Riki
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Re: 352 Crankshaft
#70
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R H
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does this mean south bend?

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Posted on: 2014/1/5 19:49
Riki
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