Thread: Connecting rod "Please Help"

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I have a set of rods and pistons i bought last summer for my 468 build and it had a spun bearing. We weren't able to get the burn completely out of the rod so were looking for a new one and having a hard time finding one!! From what i'm told it's out of a Gen IV Marine engine. It has "GMD" on the left side of the rod and "245" on the right side. That's all that marking's it has. Any help would be nice!!
The red square box is where I'm having the problems all the others I've seen have that part cut of making it weigh less than this one!

Thanks

Originally Posted by Hoss Blazer

I have a set of rods and pistons i bought last summer for my 468 build and it had a spun bearing. We weren't able to get the burn completely out of the rod so were looking for a new one and having a hard time finding one!! From what i'm told it's out of a Gen IV Marine engine. It has "GMD" on the left side of the rod and "245" on the right side. That's all that marking's it has. Any help would be nice!!

Thanks

thats a thumb rod i may one or two at the shop

if you need one or two i will look in to it BUT give me a gram weight for both ends so i can match some thing up close two your 6or7 you have GM chops alot off the weight some of them and it at time can be fun getting them to a match set if there too lite to start out with

i might have some but also would want the weights

I've search all around the internet and haven't been able to find anyone that looks like that!! Let me make a phone call to my machinist and get the weight of it.

I've search all around the internet and haven't been able to find anyone that looks like that!! Let me make a phone call to my machinist and get the weight of it. Did they only come in the Marine apps?

Originally Posted by Hoss Blazer

I've search all around the internet and haven't been able to find anyone that looks like that!! Let me make a phone call to my machinist and get the weight of it. Did they only come in the Marine apps?

hell no just a 454 and truck rod i seen them in many bbc s that is the better of the two 3/8 bolt rods as it has more metal in the fork end of the beam thats why there called thumb rods you can set your thumb in the bottom end of the beam. i used that rod most of the time for a mild build i seen engines with a 4 car rods open web down by the fork end and 4 thumb rods in the same engine

Originally Posted by pat mccarthy

hell no just a 454 and truck rod i seen them in many bbc s that is the better of the two 3/8 bolt rods as it has more metal in the fork end of the beam thats why there called thumb rods you can set your thumb in the bottom end of the beam. i used that rod most of the time for a mild build i seen engines with a 4 car rods open web down by the fork end and 4 thumb rods in the same engine

So they came in truck and Marine applications, so any truck that came w/ a gen 4 bbc would have them? I need to run over to my parts department and look in the catalog then! Why would you run 4 car rods and 4 trucks rods?

Originally Posted by Hoss Blazer

So they came in truck and Marine applications, so any truck that came w/ a gen 4 bbc would have them? I need to run over to my parts department and look in the catalog then! Why would you run 4 car rods and 4 trucks rods?

well i seen it that way . why GM ran out of one rod ? or the rebuilder just used what they had hard to say but i seen it. as for the rod yes i seen them in marine use BUT why would you buy one new rod from gm when you can buy a set of 8 used ?or one or two? this rod could be or not listed as a HD 3/8 rod from GM? there no assurance thats the rod you going too get ? i seen that rod in tall decks as well but seen 454 come with thumbs and the other of the two 3/8 rods . i would not buy a new rod from gm they know make a thinner rod beam in the mark 5/6 engines. you really need to make shure your getting a thumb rod from GM .like i said i know i have some used cores some were set up for floating pin end so if i have a press pin one then i will sell you a rod that can be rebuilt thats not been burt up .if the rest were hurt your rod s centers could be all over the map as the rods get shorter as they get cut to put the big end back to size

Originally Posted by pat mccarthy

well i seen it that way . why GM ran out of one rod ? or the rebuilder just used what they had hard to say but i seen it. as for the rod yes i seen them in marine use BUT why would you buy one new rod from gm when you can buy a set of 8 used ?or one or two? this rod could be or not listed as a HD 3/8 rod from GM? there no assurance thats the rod you going too get ? i seen that rod in tall decks as well but seen 454 come with thumbs and the other of the two 3/8 rods . i would not buy a new rod from gm they know make a thinner rod beam in the mark 5/6 engines. you really need to make shure your getting a thumb rod from GM .like i said i know i have some used cores some were set up for floating pin end so if i have a press pin one then i will sell you a rod that can be rebuilt thats not been burt up .if the rest were hurt your rod s centers could be all over the map as the rods get shorter as they get cut to put the big end back to size

Ya mine are press fit, I called my machinist and he's gonna go measure the ends and get back w/ me either later today or tonight. I'll get back w/ you, what do you wanna sell one for?

Originally Posted by Hoss Blazer

Ya mine are press fit, I called my machinist and he's gonna go measure the ends and get back w/ me either later today or tonight. I'll get back w/ you, what do you wanna sell one for?

you can PM me i do not really need a measurement . but a small and big end weight of the lightest rod in your set . i am just trying to help you out when you balance your mass .i will try to get a rod that is a match as close i can if i have one that will balance up with less work