Wrong! they only go to 7k they are crapy cast iron POS they will not stand the RPM Fair warning.

 

Hey Witt where did you buy the balance shafts from??

 

Maybe you need to read the 300 build book again, my friend. They dyno it at 8k rpm WITH the stock shafts in the engine.

 

Cobalt Performance Parts who I think actually drop shipped them from Crate Engine Depot.
The build and the pictures of the engine on the dyno are not the same engine. The dyno pics were of GMPD designing and testing the Stage 3 pulley and PCM with higher rate valve springs and neutral balance shafts along with additional cooling mods. The engine you see retaining the stock shafts has forged pistons, ported head and high duration comp cams. A way to tell what engine you are looking at is the color of paint on the head. The cammed 7k engine is black and the 8k stage 3 engine is alluminum color.

If you need more convincing that stock balance shafts should not be taken past 7k rpm read the GM stage 3 installation manual available for download at crateenginedepot.com

 

Something else to consider here. While an increase in RPM will allow you make more horsepower, you will be losing torque. Torque peak with the stock cams is around 3000 RPM and then drops off the faster you spin. If you are going to increase your RPM's, you should also be considering a cam swap that moves the torque band to a higher RPM range, hence taking advantage of it.

 

Got 272 evo spec cams on the way just for this purpose.

 

where did u get those cams i want hooks ups, these triflows are scaring me no one has seen good numbers yet i dont think