Re: Hemi vs 440 rods?
[Re: polkat]
#862307
11/24/10 03:27 AM
11/24/10 03:27 AM
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Joined: Feb 2003
Posts: 415
Indiana
Pentastar440
mopar
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mopar
Joined: Feb 2003
Posts: 415
Indiana
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RB and HEMI can use the same crank , HEMI crank has an 8 bolt flange and RB is 6 bolt. Just has to be balanced and use the correct flex plate/flywheel. HEMI / RB main bearings are interchangeable . HEMI bearings are fully grooved.
'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56
'38 Plymouth 4Dr - 408SixPack, A518, Dana60 4:10
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Re: Hemi vs 440 rods?
[Re: polkat]
#862309
11/24/10 03:45 AM
11/24/10 03:45 AM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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Depending on your idea you actually come up with a lighter bobweight than a 440-6.Not much but close to 100 grams.I had to get creative with the pistons and pins but it worked well.The Hemi rods are very heavy and today there are better options.I might add that durability was not a problem at all.I put over 82K on the combo till I sold it.Can we hear a bit about your idea?
Hemi 6.86 / 1.031 pin
LY/six pack-6.76 / 1.094 pin
Last edited by mike s; 11/24/10 03:48 AM.
Leave the gun.......take the Cannoli's....Mike
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Re: Hemi vs 440 rods?
[Re: polkat]
#862310
11/24/10 03:56 AM
11/24/10 03:56 AM
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Joined: Feb 2003
Posts: 415
Indiana
Pentastar440
mopar
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mopar
Joined: Feb 2003
Posts: 415
Indiana
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Stock rod length:
RB - 6.768
HEMI - 6.86
'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56
'38 Plymouth 4Dr - 408SixPack, A518, Dana60 4:10
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Re: Hemi vs 440 rods?
[Re: polkat]
#862312
11/24/10 02:32 PM
11/24/10 02:32 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
What is the weight and length difference between street hemi and 440 LY rods? Will the big end of the hemi rods fit the 440 crank width size? Just some ideas I'm playing with.
Hemi rods are considerably heavier than stock 440 LY rods (not sure by how much). They will fit a 440 block/crank but you will need a kings ransom worth of Mallory metal to balance it (mallory metal is not cheap). They are also about .100 longer and will probably need a custom piston.
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Re: Hemi vs 440 rods?
[Re: torkrules]
#862313
11/24/10 03:01 PM
11/24/10 03:01 PM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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You can get around the use all or most of Mallory metal if the weight is right and you externally balance it.That is of course if the idea here is similar to what I mentioned.400 balancer and weighted B&M flexplate.
Leave the gun.......take the Cannoli's....Mike
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Re: Hemi vs 440 rods?
[Re: JohnRR]
#862314
11/24/10 07:14 PM
11/24/10 07:14 PM
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Joined: Jan 2003
Posts: 17,926
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,926
S.E. Michigan
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Quote:
Quote:
Can we hear a bit about your idea?
Here we go again 
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Re: Hemi vs 440 rods?
[Re: mike s]
#862318
11/26/10 03:43 AM
11/26/10 03:43 AM
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Joined: Aug 2003
Posts: 805
Eastern WA
ProStock1320
super stock
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super stock
Joined: Aug 2003
Posts: 805
Eastern WA
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Quote:
Hemi 6.86 / 1.031 pin
LY/six pack-6.76 / 1.094 pin
Mike S had it covered above.
Must be those -25 degree temps  up your way...
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Re: Hemi vs 440 rods?
[Re: polkat]
#862320
11/26/10 12:32 PM
11/26/10 12:32 PM
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Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
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Quote:
OP here. I have a friend with some hemi rods. As RUNCHARGER said, the thought was to use the hemi rods with the stock 440 piston. I read somewhere that if you remove the bushing from the hemi rod small end, it will take the 1.09" pins just fine. My pistons are presently about .150" in the hole. With the hemi rods they would be .050" in the hole and if I decked the block .030" (it needs decking) and used the shim gasket, it would give me .042" of quench. But I didn't know about balance, hence the question. Sounds like the hemi rods would be too heavy though.
Unless you are decking it for free by dragging the deck surfaces across a big rock in your back yard it would be smarter to just get a piston that gives you what you need . 
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Re: Hemi vs 440 rods?
[Re: polkat]
#862321
11/26/10 12:32 PM
11/26/10 12:32 PM
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Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
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Quote:
OP here. I have a friend with some hemi rods. As RUNCHARGER said, the thought was to use the hemi rods with the stock 440 piston. I read somewhere that if you remove the bushing from the hemi rod small end, it will take the 1.09" pins just fine. My pistons are presently about .150" in the hole. With the hemi rods they would be .050" in the hole and if I decked the block .030" (it needs decking) and used the shim gasket, it would give me .042" of quench. But I didn't know about balance, hence the question. Sounds like the hemi rods would be too heavy though.
Unless you are decking it for free by dragging the deck surfaces across a big rock in your back yard it would be smarter to just get a piston that gives you what you need .
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