They are forged... they are the "truck" style rods, which are the better of the two (actually 3) versions of the 3/8 bolt stock rods. Resize with ARP bolts in them and they'll be plenty fine for a 150 shot...
matter of fact... with a good tune, I've thrown 275 at a set of beamed and shot peened 3/8 rods w/ARP "pro" bolts and they took it perfectly fine for dozens of bottles worth of passes. GM rods are really not as bad as people like to claim them to be... You'd be amazed at what you can reliably build with on a nicely built/machined 2 bolt studded, balanced cast crank, 3/8 ARP bolt rod, bottom end.
Same here with my 67' Camaro 275 shot with a four speed never had any problems. Like I said good bolts is the key. 396 .030 forged crank & 10:1 pistons squeezed the shit out of it....never should've sold that one!!!!
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