74 BB - rods ?
Thread Starter
Drifting
Joined: May 2005
Posts: 1,909
Likes: 6
From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
74 BB - rods ?
Actually two questions on 74 LS4
1. See the number(s) 7 stamped into the rod...??? All of my rods are stamped according to their location in the block. I have never seen this before. This motor has never been "opened" til now.
2. On the front of each cylinder is stamped ... a VERY small diamond with a 5 in the center....any idea what this meant, if anything?
1. See the number(s) 7 stamped into the rod...??? All of my rods are stamped according to their location in the block. I have never seen this before. This motor has never been "opened" til now.
2. On the front of each cylinder is stamped ... a VERY small diamond with a 5 in the center....any idea what this meant, if anything?
Racer
Joined: Feb 2007
Posts: 342
Likes: 0
From: Onley VA
Actually two questions on 74 LS4
1. See the number(s) 7 stamped into the rod...??? All of my rods are stamped according to their location in the block. I have never seen this before. This motor has never been "opened" til now.
2. On the front of each cylinder is stamped ... a VERY small diamond with a 5 in the center....any idea what this meant, if anything?
1. See the number(s) 7 stamped into the rod...??? All of my rods are stamped according to their location in the block. I have never seen this before. This motor has never been "opened" til now.
2. On the front of each cylinder is stamped ... a VERY small diamond with a 5 in the center....any idea what this meant, if anything?
Team Owner
Joined: Aug 2004
Posts: 22,437
Likes: 2
From: Hamburger Hill...MAY 69
St. Jude Donor '08
This question has been posted about rod markings from the factory many times on this and other Chevrolet forums...The responce is always with documentation , that the rods ''were not, and never were labeled for factory assembly..The motor has been apart before ..IMHO
Racer
Joined: Feb 2007
Posts: 342
Likes: 0
From: Onley VA
This question has been posted about rod markings from the factory many times on this and other Chevrolet forums...The responce is always with documentation , that the rods ''were not, and never were labeled for factory assembly..The motor has been apart before ..IMHO
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
This question has been posted about rod markings from the factory many times on this and other Chevrolet forums...The responce is always with documentation , that the rods ''were not, and never were labeled for factory assembly..The motor has been apart before ..IMHO
Team Owner
Joined: Aug 2004
Posts: 22,437
Likes: 2
From: Hamburger Hill...MAY 69
St. Jude Donor '08
Team Owner
Joined: Aug 2004
Posts: 22,437
Likes: 2
From: Hamburger Hill...MAY 69
St. Jude Donor '08
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Advanced
Joined: Jan 2007
Posts: 51
Likes: 0
From: West Jordan Ut
It does not make any sence to me. I have torn down bbc engines that have the original bearings with date stamps(in the bearings) indicating that they have never been opened up before.( some within a year of being built) also the stamp markings have been the same size & depth.( indicating the same die, they are alot of different stamp makers out there & I dont believe that everyone that owns a bbc are buying thier stamps from the same manufacture) The mains on a bbc are also factory stamped, where the sbc are never stamped (mains or rods) Starting in 1987 when GM went to the one piece rear main seal they started casting the numbers on the main caps of the sbc, but still no numbers on the rods.
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
The people doing the assembly are not exactly rocket scientists.
But hopefully they most likely can count and read numbers. 
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
I've torn down hundreds and it's very rare when I find one that doesn't have the rods marked. PM rods in the late 90's stuff seem to be a hit and miss but big blocks are marked 99% of the time. Same with main caps, if you get 'em clean, most have marks.