Balance Question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevelle454 · 08-07-2004, 09:18 AM

How critical is it that all rods be perfectly balanced in a 350? I may have mixed up which rods go where, and I even bought one from a junkyard because I bent one. Are they all a little different weight, each balanced to that part of the crank?

I have all new bearings, pistons and rings, the block was bored, and the crank was turned .010 undersize.

Chevelle454 · 08-07-2004, 09:21 AM

I should also add that it is NOT a high RPM racing motor. It is going in my truck, which will probably never see more that 4500-5000 RPM. The cam is only good to 4600, I built it to pull.

Chevelle454 · 08-07-2004, 09:45 PM

Ttt

72C203503ONTHETREE · 08-07-2004, 10:01 PM

Unless you have a really heavy rod its no big deal. The factory does not balance the rods when they make the engines, excpet maybe the Vette and Caddy engines. They are all probably within a specified range. Make sure the junkyard rod is ok and straight, might want to have all the rods resized also.

Tx Firefighter · 08-07-2004, 10:05 PM

For a street engine, you'll never know the difference.

I've built engines that my buddies called "sweep the floor motors" where I just gather up whatever usable parts I can find and put them together with new bearings, rings, and gaskets. Suprisingly, they are usually some of my better running ones. I guess it's the looser tolerances inside.

Chevelle454 · 08-07-2004, 10:11 PM

Thanks, that what I want to hear. I really didn't want to tear it back down and buy new rods...

Fred T · 08-08-2004, 01:34 AM

Unless you plan on turning over 6,000 rpm it's not a concern. No problem for your engine.

08-07-2004, 09:18 AM	#1
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Balance Question... How critical is it that all rods be perfectly balanced in a 350? I may have mixed up which rods go where, and I even bought one from a junkyard because I bent one. Are they all a little different weight, each balanced to that part of the crank? I have all new bearings, pistons and rings, the block was bored, and the crank was turned .010 undersize. __________________ 1972 C10 1972 C20

08-07-2004, 09:21 AM	#2
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	I should also add that it is NOT a high RPM racing motor. It is going in my truck, which will probably never see more that 4500-5000 RPM. The cam is only good to 4600, I built it to pull. __________________ 1972 C10 1972 C20

08-07-2004, 09:45 PM	#3
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Ttt __________________ 1972 C10 1972 C20

08-07-2004, 10:01 PM	#4
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	Unless you have a really heavy rod its no big deal. The factory does not balance the rods when they make the engines, excpet maybe the Vette and Caddy engines. They are all probably within a specified range. Make sure the junkyard rod is ok and straight, might want to have all the rods resized also. __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.

08-07-2004, 10:05 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	For a street engine, you'll never know the difference. I've built engines that my buddies called "sweep the floor motors" where I just gather up whatever usable parts I can find and put them together with new bearings, rings, and gaskets. Suprisingly, they are usually some of my better running ones. I guess it's the looser tolerances inside. __________________ I'm on the Instagram- @Gearhead_Kevin

08-07-2004, 10:11 PM	#6
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Thanks, that what I want to hear. I really didn't want to tear it back down and buy new rods... __________________ 1972 C10 1972 C20

08-08-2004, 01:34 AM	#7
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Unless you plan on turning over 6,000 rpm it's not a concern. No problem for your engine. __________________ Fred There is no such thing as too much cam...just not enough engine.

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