I have a gm tbi 350 truck engine that spun a bearing. I have a new crankshaft for it but I need one connecting rod. I believe its a pm rod. Do I have to replace it with a pm rod? Do I have to weigh other rods to get a rod thats the same weight. If anyone here knows what I need and wants to sell me a rod that would be great.
How to choose a stock connecting rod for gm tbi 350?
- Thread starter joegreen
- Start date
If you have money to burn get a new 3.75" stroke crank with 2.45" mains and aftermarket pistons to use 5.7" length rods.
The 400 SBC used shorter rods than other SBC's for clearance reasons, which a little block grinding will take care of.
The 400 SBC used shorter rods than other SBC's for clearance reasons, which a little block grinding will take care of.
I would take it and another rod/ piston to a machine shop so they can match it and balance it as close as possible to the other one.
no money to burn. It was a free engine that is in very nice shape other than the spun bearing. also has all the pre cast and tapped provisions for a factory roller cam
Sure they're PM Rods? Not a whole lot of factory TBI 350's had PM Rods, Later Gen II LT1's & Gen I L31 did.
There was also Hypereutectic & Cast Pistons used, Start mixing & matching PM with Forged rods & different weight pistons....You can end up with some vibes even at lower RPM.
I also highly doubt you need just one rod if it spun a bearing....Usually need 2 or at least have the mating rod that was on the same Pin checked.
I keep a couple Gen II LT1's around for the rotating assemblies to repair Gen I Vortec L31's.....It's getting harder & harder to find good used L31's!
There was also Hypereutectic & Cast Pistons used, Start mixing & matching PM with Forged rods & different weight pistons....You can end up with some vibes even at lower RPM.
I also highly doubt you need just one rod if it spun a bearing....Usually need 2 or at least have the mating rod that was on the same Pin checked.
I keep a couple Gen II LT1's around for the rotating assemblies to repair Gen I Vortec L31's.....It's getting harder & harder to find good used L31's!
can i just buy a rod from
no im not certain its pm. Its just something i read off the internet. When i look on rockauto it only lists a forged rod to buy so maybe its forged? Im going to reuse all the pistons so as long as i get the same rod i should be good right? Can i weight and match a new rod to an old rod myself? Also what would i look for on the mating rod that would indicate its bad?
Pictures speak a thousand words. For it to have PM rods....It would have to be at the very end of TBI/L05 production, A replacement/crate engine, Or has a later rotating assembly/rods.
Ok. If i post up a picture of the rod could you identify the type?
oh wow great. Thanks for that info. I will compare it to what i have
That's the basis for the legendary "Stroker" - a 350 block bored 0.030" over to 4.030", and the crank from a 400 to take the stroke from 3.48" up to 3.75", for a displacement of 383 c.i. (No relationship to Chrysler's big block 383.)
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