Connecting Rod 'Weight'

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69 Cuda 440

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The {273/318} Connecting Rod (#1618699)
* 726 Grams

The {late-318 and 340/360} Connecting Rod
* 758 Grams

Piston Pin (For Both Connecting Rods)
* 154 Grams

All 'LA Engine' Connecting Rods were 'Forged Steel'

Forging Numbers
* 1964-1969 {273}.........1618699 - Full-Floating
* 1968-1969 {318}.........1618699 - Full-Floating
* 1970-1971 {318}.........2406782 - Full-Floating
* 1972-1973 {318}.........2899062 - Full-Floating
* 1974-1975 {318}.........2899063 - Pressed-Pin
* 1976-1986 {318}.........3418645 - Pressed-Pin
* 1968-1973 {340}.........2899496 - Full Floating
* 1971-1974 {360}.........2899062 - Pressed-Pin
* 1974-1975 {360 HP}.....3418645 - Pressed-Pin
* 1976-1980 {360}.........3418645 - Pressed-Pin
 
and that is the reason i use scat 1 beams 4340 rods...

595 grams...
 
the 1ns i have for sale in yersterdays treads were all 3418645 1 set was maggedand a quik hone and i do have new arp bolts for sale with them

the reat look good 10.00 per rod there good up to 400 horseis get
 
I'm running a set of #1618699 Rods in one of 273 Drag Race Cars.

We ground the hell out of the rails, and polished the beams and installed
'two' scavenger oil holes in the Pin Boss.

We also took some weight out of the 'Piston Pin', by honing out the center
some.

Just a 'project', but it worked and the 'no problems' so far.......
 
My 71 Casting date 318
Factory rod/ had factory 71 date stamped rod bearings.
Rod forging number: 2406782...................718 Grams.
They have been resized, rebushed, balanced, and fitted with ARP bolts though.


I like seeing members post this kind of info. Helps a lot of people. Thanks!!
 
64 SRT8 Dart said:
My 71 Casting date 318
Factory rod/ had factory 71 date stamped rod bearings.
Rod forging number: 2406782...................718 Grams.
They have been resized, rebushed, balanced, and fitted with ARP bolts though.


I like seeing members post this kind of info. Helps a lot of people. Thanks!!
Click to expand...
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I'm pretty sure the #2406782 Connecting Rods were used for the
1970 and 1971 '318 Engines'.

These 'Rods' are a touch lighter than the #1618699 '273 Skinny Rods'.

But, some claim they were called '318 Marine' Connecting Rods that
had higher strength material.

"More - Mystery - Myth - Misconception"
 
* 273/318 'Skinny Rods'
* Weight = 726 Grams

$(KGrHqN,!qsFEFfym0o5BRKLyVohb!~~60_12.JPG



* 340 'Beefier Rods'
* Weight = 758 Grams
* Look heavier than only (+32 Grams) over the '273/318 Skinny Rods')

$(KGrHqZHJBQE7))9WB09BP!6!jwf-g~~60_35.JPG
 
hi, as a side note to weights. the 273 /180 had a 220 gm pins, the 235 /273 had a 184 pins. I have weighed them both. 273 pins are shorter also.
 
Robbie,

The 1993 'Magnum' Connecting Rods {Casting #53005798} look to be slightly lighter than the 'late-318 and 340' 'LA Engine' Connecting Rods.

Connecting Rod Weight.....744 Grams
Piston Pin Weight.............134 Grams

The 'top end' on the 'Magnum Rod' is 1.00" wide, while the 'LA Engine' Rod is 1.17" wide.

The 'big end' on the 'Magnum Rod' is 1.16" wide, while the 'LA Engine' Rod is 1.20" wide.

$(KGrHqFHJEgFD26fcvcLBQ9vpHTWEg~~60_12.JPG
 
Seems my Ross racing forged aluminum pistons with wrist pin weigh (according to Ross' website) 514 grams.
 
the 416 ross pistons i have weight 497

i have some 390 (318 stroker) that weight 439 grams...
 
70aarcuda said:
the 416 ross pistons i have weight 497

i have some 390 (318 stroker) that weight 439 grams...
Click to expand...

Stroker pistons are usually lighter than stock style pistons. The reason being is the manufacturer moves the pin closer to the head of the piston to compensate for the increase in stroke. otherwise the piston would stick out of the hole considerably. By moving the pin closer to the head of the piston there's no need for all the extra material under the pin so its removed thus producing a lighter piston.
 
_DJV9003.jpg


just for ***** and giggles...

From left to right :

4.125" Stroke setup - BPE Piston - .927 pin - Compstar 6.200 Rod w/ 2" journal - total weight - 1186g - Total Bobweight - 1749g

4" Cast Stroke setup - KB Piston - .984 pin - SCAT 6.125 rod w/ 2.125" journal - total weight - 1216g - Total Bobweight - 1799 G

3.31" Stroke Setup - Stock Piston - .984 pin - Stock rod - total weight - 1508 - Total Bobweight? over 2000 G I assume?
 
SRP 360 flattops are pretty light as well, listed at 489 - 503 grams. Probe is a bit heavier and at a reasonable price also. Piston weight is a big factor in rod life.
 
yes..and the weights listed on Ross web site is for the piston only does not include the weight of the pin.

I was sighting an example where as the piston i have in a box ..that i weight without the pin the weight listed on Ross web site
 
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