Have forged crank and gm rods . Lol was just told the same thing
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There are at least three different sets of GM BBC rods capable of different power levels.
Would like to mention that, Manley H-beam rods are pretty nice but on the heavy side. They are an imported forging that is domestically machined. Every Manley set that I have been involved with has been within tolerance and balanced.
I don't have any experience with Scat or Eagle, but some of the other imports, typically have had to send out two rods, from every set, to be sized.
With that being said, if you need to resize your rods and/or replace the fasteners (requiring resize), the cost of a new set of rods doesn't look bad at all.
If you feel the need to buy new rods and/or a new crankshaft, you are really selling your build short by not building a stroker.
Otherwise the money would be better spent on better heads and roller cam.