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Re: 69' 273 cast or forged crank?
[Re: kenworth_goose]
#110775
08/26/08 06:49 PM
08/26/08 06:49 PM
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Joined: Nov 2006
Posts: 3,407
S.E. Florida, USA
rrunner
master
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master
Joined: Nov 2006
Posts: 3,407
S.E. Florida, USA
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Quote:
Steel. If you don't know how to tell by looking, hit the end where the flexplate bolts lightly with a hammer, if it's a cast crank it willl make a thud, steel will ringgggggggg. All 273's had steel cranks.
I thought all cranks were steel!  
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Re: 69' 273 cast or forged crank?
[Re: kenworth_goose]
#110776
08/26/08 08:01 PM
08/26/08 08:01 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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273's and 318's had forged cranks through 67; 68 and later have cast cranks.
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Re: 69' 273 cast or forged crank?
[Re: kenworth_goose]
#110777
08/26/08 08:09 PM
08/26/08 08:09 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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413coronet is correct.  this... Quote:
.... All 273's had steel cranks....
A very popular misconception. I thought so too.
I have seen charts that show cast crank part numbers for 273's starting in 68.
I owned a 69 273 that was a cast crank, much to my dissapointment. (that got me looking in to it a little more)
Here is a bit of the chart. I believe it has appeared in couple of different books.
year cid material cast#/forge#
64-67 273 forged 2128278, 2128869, 2205700
68-69 273 cast 2658268, 2658393
67-73 318 cast 2658278, 2658393
74-86 318 cast 2658278, 2658393, 3462387
2658391
68-72 340 forged 2532457, 2843868
73 340 cast 3462387
71-86 360 cast 3418640, 3418641, 3418642
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Re: 69' 273 cast or forged crank?
[Re: John_Kunkel]
#110785
08/28/08 01:21 PM
08/28/08 01:21 PM
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Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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Cast crank = lighter rotating assembly?
Spins up faster?
273?
Slant?
"Cast please!"
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: 69' 273 cast or forged crank?
[Re: dogdays]
#110787
08/28/08 04:43 PM
08/28/08 04:43 PM
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Joined: Jan 2003
Posts: 21,670
San Jose,CA
migsBIG
OP
YouTube is my go-to news source
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OP
YouTube is my go-to news source
Joined: Jan 2003
Posts: 21,670
San Jose,CA
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Quote:
As there are no balance differences between a 273/318 forged and cast crank one CANNOT be lighter than the other, counterweights must be the same because the rods and pistons are the same weight. If there are differences they are so minor as to be inconsequential.
For anything less than a high rev drag race motor either forged or cast 273 or 318 crank is up to the task.
For anyone hoping to build a high-hp 340 the first thing to do is to GET RID of those 720-gram stock pistons and stick some 450-gram pistons in the holes.
R.
That's what I'm building, a late 1972 340. I am putting in some nice, low weight pistons and I beam rods, just wanted the extr insurance of a forged crank. Car weights 4100 with me and a full tank of gas. With the better crank, I won't get too wooried when I stab the throttle.
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Re: 69' 273 cast or forged crank?
[Re: migsBIG]
#110789
08/30/08 11:59 AM
08/30/08 11:59 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
That's what I'm building, a late 1972 340. I am putting in some nice, low weight pistons and I beam rods, just wanted the extr insurance of a forged crank. Car weights 4100 with me and a full tank of gas. With the better crank, I won't get too wooried when I stab the throttle.
Not to worry at either. we sold a great many 2 ton farm trucks with 318's in them and they hauled 350+ bushels of wheat (at 60 lbs. bu.) out of the fields and down the roads and didn't break any crankshafts. 
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Re: 69' 273 cast or forged crank?
[Re: MoparforLife]
#110792
08/31/08 11:41 AM
08/31/08 11:41 AM
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Joined: Jan 2003
Posts: 8,501
Candler,NC / Myrtle Beach, SC
JDMopar
master
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master
Joined: Jan 2003
Posts: 8,501
Candler,NC / Myrtle Beach, SC
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Quote:
Quote:
That's what I'm building, a late 1972 340. I am putting in some nice, low weight pistons and I beam rods, just wanted the extr insurance of a forged crank. Car weights 4100 with me and a full tank of gas. With the better crank, I won't get too wooried when I stab the throttle.
Not to worry at either. we sold a great many 2 ton farm trucks with 318's in them and they hauled 350+ bushels of wheat (at 60 lbs. bu.) out of the fields and down the roads and didn't break any crankshafts.
Hey Don....I always wondered this, and I'll bet you know  The 318 engines in some Dodge trucks had what has always been called the 318-III truck crank in them, and it was supposed to be better than a forged 340 crank. Would pickups have the motor with that crank, or was it just big trucks like you talked about in your above reply? 
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