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Will 273/early318 rods live in a mild 360? #2850568
11/23/20 03:54 PM
11/23/20 03:54 PM
Joined: Jan 2003
Posts: 1,255
Columbus, GA
Michael Ecks Offline OP
pro stock
Michael Ecks  Offline OP
pro stock

Joined: Jan 2003
Posts: 1,255
Columbus, GA
Wondering if the weight saving would be worth putting them in a daily/street 360.

9.5:1 CR, unported 308 heads and 4BBL, with something just a tad hotter than a 340 camshaft.

Nothing too extreme.


"The happiness of your life depends upon the quality of
your thoughts" ~ Roman Emperor Marcus Aurelius
Re: Will 273/early318 rods live in a mild 360? [Re: Michael Ecks] #2850583
11/23/20 04:30 PM
11/23/20 04:30 PM
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar Offline
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tubtar  Offline
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St. Paul , Mn.
Worth is a relative term.
Do you mean slap them in and not look back ?
Or have them re-conditioned and put good bolts in there ? $
Throwing a lighter rod in an existing motor would necessitate having the rotating assembly re-balanced if I were doing it.......and if you're going that far , then you have reconditioned the rods. $$
Would the rods live ?
I don't see where it would be a problem in a mild build as far as durability goes.

Re: Will 273/early318 rods live in a mild 360? [Re: tubtar] #2850613
11/23/20 05:33 PM
11/23/20 05:33 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
[/quote] I don't see where it would be a problem in a mild build as far as durability goes.
[/quote] agreed, do check the bobweight change/talk to your balancer. EDIT with more thought you might be better off keeping your current rods, more info needed on what you are doing. those rods may be floating pins which need locks on the pistons.

Last edited by RapidRobert; 11/23/20 06:16 PM.

live every 24 hour block of time like it's your last day on earth
Re: Will 273/early318 rods live in a mild 360? [Re: RapidRobert] #2850641
11/23/20 06:31 PM
11/23/20 06:31 PM
Joined: Jan 2003
Posts: 1,255
Columbus, GA
Michael Ecks Offline OP
pro stock
Michael Ecks  Offline OP
pro stock

Joined: Jan 2003
Posts: 1,255
Columbus, GA
Currently have a 360 roller torn down that I want to rebuild to replace the 250K-ish engine in my challenger. I have another 360 roller that I will be taking my time with building a stroker 408.

Stock rods from the 360 would need rebuilding. I have a line on a cheap set of already reconditioned early 318 bushed rods, that I would add ARP rod bolts to and probably grind and polish the casting lines from the beams. Pistons will be KB107 which are lighter than stock, so I'll be rebalancing any way. Also the KBs are pressed or floating and come with spiral locks. Would prefer SCAT I beams, but it looks like they have gone up in price, and I would rather put that much money toward the stroker. I just don't want the rods to be a ticking time bomb in the bottom end. No racing, no nitrous or power adders,

Last edited by Michael Ecks; 11/23/20 06:36 PM.

"The happiness of your life depends upon the quality of
your thoughts" ~ Roman Emperor Marcus Aurelius
Re: Will 273/early318 rods live in a mild 360? [Re: Michael Ecks] #2850652
11/23/20 06:56 PM
11/23/20 06:56 PM
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Posts: 3,055
Michigan
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A727Tflite Offline
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A727Tflite  Offline
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Michigan
Putzing around town you would be fine.

The trick of the day in Stock Eliminator back in the 70’s and 80’s was using the 318 rod in a 340 or 360 application.

Knew a few guys that used them for a long time without any issues, and no clean neutral transmissions back then either.

Re: Will 273/early318 rods live in a mild 360? [Re: A727Tflite] #2850699
11/23/20 08:45 PM
11/23/20 08:45 PM
Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
topside Offline
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topside  Offline
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So Near, Yet So Far
The rods in my 273 and a few 318s were just fine, lots of street miles.
May not be the best long-term plan if the interim motor sees a future performance build, but I get the financial angle.

Re: Will 273/early318 rods live in a mild 360? [Re: topside] #2850717
11/23/20 09:10 PM
11/23/20 09:10 PM
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Posts: 81
langley b.c. canada
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don miller Offline
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langley b.c. canada
Back before cheap aftermarket rods and cranks where available the hot tip was to use rods from a 318-3 (industrial or marine engine) these looked like baby hemi or 6 pak rods. They were quite a bit beefier than the stock rods and of course heavier. Inadequate oiling caused more engine failures back then than did rod strength

Re: Will 273/early318 rods live in a mild 360? [Re: Michael Ecks] #2850722
11/23/20 09:22 PM
11/23/20 09:22 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
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Posts: 20,116
PA.
Originally Posted by Michael Ecks
Currently have a 360 roller torn down that I want to rebuild to replace the 250K-ish engine in my challenger. I have another 360 roller that I will be taking my time with building a stroker 408.

Stock rods from the 360 would need rebuilding. I have a line on a cheap set of already reconditioned early 318 bushed rods, that I would add ARP rod bolts to and probably grind and polish the casting lines from the beams. Pistons will be KB107 which are lighter than stock, so I'll be rebalancing any way. Also the KBs are pressed or floating and come with spiral locks. Would prefer SCAT I beams, but it looks like they have gone up in price, and I would rather put that much money toward the stroker. I just don't want the rods to be a ticking time bomb in the bottom end. No racing, no nitrous or power adders,



Not my build but for the price I know what I would be buying


https://www.cnc-motorsports.com/2-i...ium-pro-comp-i-beam-connecting-rods.html


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Will 273/early318 rods live in a mild 360? [Re: pittsburghracer] #2850761
11/23/20 10:46 PM
11/23/20 10:46 PM
Joined: Jan 2003
Posts: 3,504
DFW
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mr_340 Offline
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DFW
The 273 rods I pulled out of an engine a couple of years back weighed around 727 grams (502g on the big end, 225g small end). I'm sure you can find something lighter and stronger. The Eagle SIR rods are 100g lighter EACH. https://www.summitracing.com/parts/esp-6123cb/make/dodge


Floyd Lippencott IV






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