Any real difference between factory 340 and 360 connecting rods?

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dibbons said:
The engine is a "hodgepodge" 340 in storage that had small leak in the timing cover behind the water pump (see foto).

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You stated earlier that the engine is already .040 over; what are your plans? Besides timing cover replacement.........

Do you still have any bearing shells? If so, what is/are the date codes? What do the balance pads on the rods look like? Mostly there, or ground off?
 
I plan to replace the rings and bearings and run it. The one 340 rod definitely has some meat ground off the pad on the large end. I will have to look for the old bearings.
 
speedmaster rod that sell for 201.00

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Are those bronse bushed on the wrist pin end for full floating pins? Hard to see in the pic.
 
well..forgot to weight them....been at race track all day...will get them in the next day or two...
 
my engine book by larry shepard shows 340 rod- *2899496 and 1972-73 318 rod- *2899496 = bushed . 3418645 also used = bushed, I have a set out of a 1973 340-
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Yes..they are bushed....and again I was standing right next to the scale and forgot to weight one...but they are around 680 grams..
 
dibbons said:
I can get fotos of the rods tomorrow if someone wants.
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Rod on top in foto is 360, rod on bottom is 340. The balancing pad on the large end of the 340 rod has been ground down quite a bit and the pad on the 360 rod looks to be virgin (untouched).

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dibbons said:
Rod on top in foto is 360, rod on bottom is 340. The balancing pad on the large end of the 340 rod has been ground down quite a bit and the pad on the 360 rod looks to be virgin (untouched).

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I think you might have that reversed The top one has a retaining clip, that would be the with the floating pin, therefore that would be the 340 rod & piston
 
If the pins are floating wouldn't they need retaining clips to hold them in place?
 
There is a clip on both that I see. Shadow makes it hard to see
 
dibbons said:
Rod on top in foto is 360, rod on bottom is 340. The balancing pad on the large end of the 340 rod has been ground down quite a bit and the pad on the 360 rod looks to be virgin (untouched).

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Pad on bottom rod definitely is smaller relative to the upper rod, though it still might be all out of the factory condition. Does the pad of the bottom rod look like it was dressed on a grinder/belt sander, or does it have machine tooling marks?

Looks like bearing shells are still in the big ends of the rods, pull one apart and check date code on the back side of the shell, that will let you know when it was touched last.
 
JBurch said:
Pad on bottom rod definitely is smaller relative to the upper rod, though it still might be all out of the factory condition. Does the pad of the bottom rod look like it was dressed on a grinder/belt sander, or does it have machine tooling marks?

Looks like bearing shells are still in the big ends of the rods, pull one apart and check date code on the back side of the shell, that will let you know when it was touched last.
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the stock rods are very good. we ran a set of 496 rods with trw pistons for 1800 passes @ 7000 rpm. never broke a rod. they had mopar hp bolts replaced every 4 years. that relates to 18 years of racing. mopar built their stuff to last.
 
perfacar said:
the stock rods are very good. we ran a set of 496 rods with trw pistons for 1800 passes @ 7000 rpm. never broke a rod. they had mopar hp bolts replaced every 4 years. that relates to 18 years of racing. mopar built their stuff to last.
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Glad you spoke up perfacar. Stock eliminator is where is the thinkers hang out.
 
70aarcuda said:
Gasoline used to 25 cent a gallon...lol
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Lowest I ever saw it was during the gas wars in the 60s....17 cents a gallon. We'd go out on the weekends and collect empty coke bottles and trade them in for cash (5 cents each, the quart bottle fetched a dime) to have plenty of gas to go cruising!!
AHhhh, those were the days!!!! You could survive on almost nothing!!

Treblig
 
Treblig said:
Lowest I ever saw it was during the gas wars in the 60s....17 cents a gallon. We'd go out on the weekends and collect empty coke bottles and trade them in for cash (5 cents each, the quart bottle fetched a dime) to have plenty of gas to go cruising!!
AHhhh, those were the days!!!! You could survive on almost nothing!!

Treblig
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I was walking to school when gas hit $1.00 a gallon. I didn't quite have a car yet. So I was pissed.
 
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