Pros and cons of using Chevy sized rods in hemi build
#3170970
08/28/23 08:21 AM
08/28/23 08:21 AM
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Joined: Jan 2003
Posts: 657
Berlin NJ
scottk
OP
mopar
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OP
mopar
Joined: Jan 2003
Posts: 657
Berlin NJ
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Hi. Getting ready to order some parts. Have a 4.5 bore Hemi block and some Diamond pistons for 4.25 stroke. They have .990 pins. Wondering if using the .220 rod size has any advantages? Less or no clearancing in the block? Is the Chevy size weaker because it is smaller? Just trying to weigh things out. Thanks.
Last edited by scottk; 08/28/23 08:22 AM.
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Re: Pros and cons of using Chevy sized rods in hemi build
[Re: scottk]
#3170985
08/28/23 09:02 AM
08/28/23 09:02 AM
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Joined: Jan 2003
Posts: 13,367
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,367
Marion, South Carolina [><]
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No cons. All pros. Less weight, more clearance, more options, plenty strong.
I have BB Chevy rods in my 575" hemi.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Pros and cons of using Chevy sized rods in hemi build
[Re: 440Jim]
#3171021
08/28/23 10:47 AM
08/28/23 10:47 AM
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Joined: Jan 2012
Posts: 2,652
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,652
Stuttgart, Arkansas
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As already said, you don't use Mopar rod (or pin) sizes anymore. Too many advantages to using Chevy rods. Stroke clearance, weight, bearing sizes, availability, price. Rod choices, price, availability. Come on and join the 21st century. And, no, I wouldn't think about using them on a Mopar width journal.
2011 Drag Pak Challenger
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Re: Pros and cons of using Chevy sized rods in hemi build
[Re: scottk]
#3171054
08/28/23 12:21 PM
08/28/23 12:21 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Reduced rod journal diameter reduces journal overlap and makes the crankshaft more flexible (so does a stroke increase).
Not enough to worry about.
Boffin Emeritus
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Re: Pros and cons of using Chevy sized rods in hemi build
[Re: polyspheric]
#3171180
08/28/23 06:59 PM
08/28/23 06:59 PM
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Joined: Jan 2003
Posts: 7,490
Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,490
Minnesota
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If you don't have the crankshaft yet, check into getting it with chevy width rod journals as well as diameter. THen you can use chevy rods. Sometimes they are cheaper and easier to get than Mopar rods with Chevy journal diameter but Mopar width.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Pros and cons of using Chevy sized rods in hemi build
[Re: polyspheric]
#3171202
08/28/23 08:18 PM
08/28/23 08:18 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Reduced rod journal diameter reduces journal overlap and makes the crankshaft more flexible (so does a stroke increase).
Not enough to worry about. That would be my thinking. On a SB Mopar stroker, I was liking 2.0 chevy rods, but keep the big 360 mains, to try and get the best of both worlds.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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