basically a string and hanger that holds one end of a connecting rod ,
while you use a digital gram scale to weight the other end of the connecting rod,
if you have a burret stand for ccing heads that could be used to support the rod hanger
that rod balancing tool from comp cams might be a good investment for the price,
if you build several engines, as it might be easier to use than the string/hanger with the digital gram scale alone thats the suggested $15 version
as its rather typical for a machine shop to charge you over $100 to balance the connecting rods on a single engine!
notice the SCAT connecting rods are already close to being perfectly balanced as they come out of the box, in most cases, that's one reason I've constantly suggested use of 4340 forged crank assemblies and scat connecting rods with 7/16" rod bolts on most of my big block engine builds
I checked on the price of the comp cams rod balancer, its close to $100
COMP Cams Engine Connecting Rod Balancing Tool 4999; Rod Weight Fixture
COMP Cams Connecting Rod Balancer compares two rods at a time to show which one is heavier. Material can be removed from heavier rods until all are of equal weight. The fixture will hold rods from either the big or small end so both rotating and reciprocating weights can be balanced. WARNING...
www.performanceparts.com
(which is not part of the rod balancing tool unless you decide to invest more money to have a more accurate fixture)
obviously you need an accurate digital GRAM SCALE
if you want to carefully measure and machine connecting rods to equalize the rod weights end to end
if you have a burret stand you use for ccing heads you can use that to hold the string and hanger on the rod balance scale combo
btw remember the formula for engine displacement is
bore diameter x bore diameter, times stroke, times number of cylinders, times .7854+ displacement
example
a 4.5" bore x 4.5" bore, times 4.375" stroke, times 8 cylinders, times .7854 =557 cubic inches
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