connecting rod help

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twool

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I have some conn. rods with casting #3418645 and they are full floating.What year are they and what year did they come out in
 
they are 1971-73 318 + 340-with bronze bushing-same forging without bushing used in later 318+360
 

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throw that book out, twool said full floating, I have torn apart many stock 318 and 340 to find the 3418945 floating rods. the 2899496 rod was used in early 340s
 
Connecting Rods

Year Engine Service Part # Forging # Pin Type Center To Center Length

64-71 273 2406785 1618699 floating 6.123 Inches
68-71 318 2406785 1618699 floating 6.123
72-73 318 2899061 &*2899062 floating 6.123
2899495
74-75 318 2899061 2899063 pressed 6.123
76-86 318 3751015 3418645 & pressed 6.123
3751016
68-73 340 2899495 2899496 floating 6.123
71-74 360 2b 2899061 *2899062 pressed 6.123
74-75 360 HP 3751015 3418645 pressed 6.123
76-80 360 3751015 3418645 pressed 6.123
* 3418645 & 3870404 also used.
 
I have a set that came out of a 1971 318 that came out of a D600 truck. So based on that, they could be used any where Chrysler wanted a full floating piston/rod assembly. Nothing special, but nice to have if you need them.
 
LA rods are either big (340-3604bbl) or small (273/318) not much difference anywhere else. Bushed or press, that was just a final machine step. I always prefer floaters, just easier to work with. Magnum rods have a narrower wrist pin end.
 
Bad Sport said:
Connecting Rods

Year Engine Service Part # Forging # Pin Type Center To Center Length

64-71 273 2406785 1618699 floating 6.123 Inches
68-71 318 2406785 1618699 floating 6.123
72-73 318 2899061 &*2899062 floating 6.123
2899495
74-75 318 2899061 2899063 pressed 6.123
76-86 318 3751015 3418645 & pressed 6.123
3751016
68-73 340 2899495 2899496 floating 6.123
71-74 360 2b 2899061 *2899062 pressed 6.123
74-75 360 HP 3751015 3418645 pressed 6.123
76-80 360 3751015 3418645 pressed 6.123
* 3418645 & 3870404 also used.
Click to expand...

We must have the same book..better throw it out according to the "experts" here it wrong:prayer::prayer:
 
I'm with the boys who found those rods either way, back in the day.

I too prefer the bushed rods. Unfortunately, it seems that not every engine shop can correctly install those bushings, as i found two of them migrating, just months after the rebuild. It was at the first winter's inspection. I found a new machine shop. After that,the bushings stayed put.
 
"72-73 318 *2899062 floating *3418645 also used" and they came in 340's floating, if you read enough books you will find they are written by people and are not perfect
 
ancient thread but it popped up when i googled the rod numbers.

so i have these, guy said they were from a 340. they are not bushed. pins are pressed in. i should probably measure the pistons one of these days.

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IMG_20240321_100233.jpg
 
360's in any form used those rod forgings, unbushed with pressed pins. Later 318's also used them unbushed with pressed pins. Later 340's used the same forging with bushed pin ends for floating pins. Not sure of the dates when the 3418645 rod forgings started. My "71" 340 had them. All small block LA piston pins are the same diameter, 273 pins are shorter. I would guess your pistons are 360, because of the dish.
 
Just sold a set of '645's out of my '69 340 to a friend that restores Challenger TA's and AAR Cuda's. He is a bit of a stickler and tries to use as many stock hard parts as possible, even if you can't see it.
 
Old post. I know.
But I have three sets of 3418645 connecting rods, two sets are pressed fit and one is floating?
Maybe the floating rods were originally press fit and changed to floating rods at some point??

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Yes, that would be my guess. The ones that I sold to my friend were floating.
 
pishta said:
LA rods are either big (340-3604bbl) or small (273/318) not much difference anywhere else. Bushed or press, that was just a final machine step. I always prefer floaters, just easier to work with. Magnum rods have a narrower wrist pin end.
Click to expand...
What do you mean by big or small? The only difference that I know of is that either they have pressed wrist pins or floating. 360 rods will work on a 318 with no problem
 
The big and small reference is this, 273 and early LA 318 rods (small) weighed 726 grams, later (LA)318, 360 rods weighed 756 grams (big).
 
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