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Author Topic:   Late Model GM Rods
Hobby152003
Member
posted August 16, 2003 10:06 AM
Whats everyone think about the late model GM rods? I tryed them and had 5 & 6 break. Don't know if it was bad luck or just junk rods. Got one more set and don't want lose another block.


4340
Member
posted August 16, 2003 11:18 AM
if your talking Gm powder rods, i have used them for several years in 13-1 motors 6500 rpm.

no rod failures, but when a crank breaks, the rods will break rather than bend and twist.

i got mine from competition products, now they have 5140 chinese aftermarket rods cheaper so i would go that way.



Hobby152003
Member
posted August 16, 2003 12:13 PM
yes the powder coated rods. My crank did'nt break. One rod was broke right in the middle and the other snacthed the rist pin out, and twisted the rod. I'm not sure what happened first. My recall on the tach said i was turning 6900. Within that five laps I had pulled out a good 1/4 of a track lead. The track size is 1/2 to 5/8 mile long.


66jj
Member
posted August 16, 2003 05:01 PM
sounds like you clearly pulled the pin and bottom of piston out first to me.

another rod breaking wouldnt cause that to happen.

thats more rpm than I turn cheap pistons ever.

i know lots of people get away with it, but ive never been lucky.

jj

sbc350
Member
posted August 17, 2003 12:10 PM
They are powdered metal rods, and yes they will break. They won't bend. Everyone i've ever asked says they don't belong in a racing engine. But hey, some guys have used them with success.


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