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Old 06-26-2006, 09:55 AM   #1
scootermcrad
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Default HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Next Hemi subject... Crankshafts!

1) Stock cranks-
- What should be done to a stock crank in a rebuild and for what application?
- When should shot peening be a consideration?

2) Billet cranks-
- worth the money?
- When to use?
- who makes them and who puts out quality?

3) Strokers- (without getting into building a stroker motor)
- what cranks are used and for what motor?
- modifications required to other components or the crank itself to work?

4) Interchangability- (all makes)
- What will work with what?
- When should a change be made?

Plenty to talk about! Have at it! I'll start looking for links to fill out the subject...
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Old 06-26-2006, 10:20 AM   #2
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Some info on rear main seal and crank surface:
http://www.jalopyjournal.com/forum/s...emi+crankshaft
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Old 06-26-2006, 10:23 AM   #3
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Some quick info on 392 cams and stroking:
http://www.jalopyjournal.com/forum/s...ght=hemi+crank
One more:
http://www.jalopyjournal.com/forum/s...ght=hemi+crank
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Old 06-26-2006, 11:22 AM   #4
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

A little note I found on www.thehemi.com about using a 331 crank in a 354:

Contributed by Spence Sharp


The early 331 Hemi crankshafts, while they can be a direct replacement for 354 Hemi crankshafts, have smaller oil feed holes. 1/4" vs 5/16". They work okay for street use, but should not be used for racing unless the holes are opened up and chamfered.
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Old 06-28-2006, 11:37 AM   #5
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Can anyone add anything about oil feed holes? Diameters? Location differences in certain cranks? Lack there of maybe?

Also, what is the difference in counter-weights for various cranks?
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Old 06-28-2006, 11:57 AM   #6
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Quote:
Originally Posted by scootermcrad
A little note I found on www.thehemi.com about using a 331 crank in a 354:

Contributed by Spence Sharp


The early 331 Hemi crankshafts, while they can be a direct replacement for 354 Hemi crankshafts, have smaller oil feed holes. 1/4" vs 5/16". They work okay for street use, but should not be used for racing unless the holes are opened up and chamfered.
Also the '55 Chr.301 poly crank.
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Old 06-28-2006, 02:11 PM   #7
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Any info on putting a 392 crank in a 354 block? I now it needs to be turned down a bit. Maybe offset ground . Any other snags?
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Old 06-01-2007, 12:40 PM   #8
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

http://victorylibrary.com/mopar/hemi-c2.htm
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Old 06-01-2007, 12:52 PM   #9
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Also, the different makes do not even come close to being interchangable. You can not hook a Desoto low deck hemi to any Chrysler or Dodge hemi and expect the parts to work. Unfortunately, Desoto was on their own in the hemi world. Not many parts will interchange with the small bore, pocket hemi blocks. Just requires too much time and money for machine work.
Just to make a small bore hemi, per say a 276ci unit work properly, the machine shop work will be well over $3K for time alone in mods.
Mopar is one thing, but even in the early Mopar family, they still had great barriers between them. Desoto being the worst step child of all.

Maximo
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Old 06-01-2007, 01:11 PM   #10
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

I once saw a 247? inch ('55) Pontiac crank at Ashland grinding, that had had the rod jurnols welded and narrowed to 354 Chrysler width. They were already the correct diameter. A new snout had been welded on over the Pontiac part and the idea was to machine it to recieve the Chrysler timing gear. This would give you a very short stroke engine, making a 331 with an overbore a 300 inch motor. The project was never finished and the crank left out and became quite rusty. I have it now but have agreeed to sell it with the rest of my hemi parts.
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Old 06-01-2007, 01:13 PM   #11
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Anyone have a 392 block for sale in the wisconsin area?
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Old 05-12-2009, 04:41 PM   #12
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Back in the early 60's when I was building a 354 for blown fuel,
Ashland Grinding in Hayward CA, added 2 counter weights and grooved the mains to my stock crank. I also built a bottom end support, and had it linebored.
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Old 05-14-2009, 04:02 PM   #13
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Quote:
Originally Posted by RichFox View Post
I once saw a 247? inch ('55) Pontiac crank at Ashland grinding, that had had the rod jurnols welded and narrowed to 354 Chrysler width. They were already the correct diameter. A new snout had been welded on over the Pontiac part and the idea was to machine it to recieve the Chrysler timing gear. This would give you a very short stroke engine, making a 331 with an overbore a 300 inch motor. The project was never finished and the crank left out and became quite rusty. I have it now but have agreeed to sell it with the rest of my hemi parts.
It would probably be easier to swap the pistons and top end on a 301 poly.
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Old 05-14-2009, 04:07 PM   #14
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Quote:
Originally Posted by LordMaximo View Post
Also, the different makes do not even come close to being interchangable. You can not hook a Desoto low deck hemi to any Chrysler or Dodge hemi and expect the parts to work. Unfortunately, Desoto was on their own in the hemi world. Not many parts will interchange with the small bore, pocket hemi blocks. Just requires too much time and money for machine work.
Just to make a small bore hemi, per say a 276ci unit work properly, the machine shop work will be well over $3K for time alone in mods.
Mopar is one thing, but even in the early Mopar family, they still had great barriers between them. Desoto being the worst step child of all.

Maximo
Dodge, Desoto, and Chrysler parts do not interchange....period..... Please don't nitpick, I don't want to hear about oil filters and valve cover nuts. The three are not even dimensionally the same.
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Old 05-14-2009, 04:23 PM   #15
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Actually there are some hard parts that interchange. All 3 share using the "big block" later valve lifters. All 3 (55-up) share using the LA timing chain and gears. DeSoto and Chrysler from 56-58 share the same oil pump. All Dodge and 55-up Chrysler share same timing covers. Of course there are the spark plug tubes; can't remember the interchange. All the trans bolt patterns are the same except the 51-53 long bell Chrysler. Probably some more but they just don't come to mind.
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Old 05-14-2009, 04:41 PM   #16
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

My dad had sonny bryant do a billet stroker for his willys. He had it made with big block chev rod journal size. Started out as a 354", ended up a 420". Too freakin' complicated for me, just turn down the mains on a 392 crank. I think you have to take a smidge off of the counterweights too. Someone please detail this process, I don't think machine shops have butt hair gauges anymore.
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Old 05-14-2009, 04:45 PM   #17
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

Quote:
Originally Posted by scootermcrad View Post
Sorry, got ahead of myself, click the second link.
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Old 05-14-2009, 04:50 PM   #18
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

The 392 crank can be used in a 301-331-354 by turning down the mains as well as the area for the rear seal. Depending on how snug you want the install to be you can trim the counterweights a little or a lot, as long as it fits.
The B engine rod is just about perfect at 6.358". This combo will put the stock piston 0.014" higher in the bore which just about compensates for the current crop of fat head gaskets.
The best solution for the increase in rod width is to weld up the rolled fillet and then refinish the journal to B-RB specs. The savings in bearing costs will almost pay for the journal work.


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Old 07-28-2010, 05:07 PM   #19
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

If I wanted to build a street blown 331 (I have a '55 C300 block and heads), do I have to go into a stroker or can I build from the 331 using just better rods and pistons? Would a 331 crankshaft hold up to say 7-10lbs boost? Or would I have to go with an off-the-shelf 4340 crankshaft? I am hoping I wouldn't have to go the 392 crank in my 331 block route.
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Old 07-28-2010, 06:25 PM   #20
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Default Re: HEMI Tech- Crankshafts. Stock? Billet? Stroker?

I'm sure others will opine...the crank and block are fine!

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