Thats a lot of RPM with stock rods. Tho, this motor does have a set of Aubrey's lightened pistons installed
Don't I wish, Jason, Don... nope... this is a stock 63 "QB" short block. Pistons are factory stock, standard size GM / TRW 11:1 forged ( it's 409 cubic inches ). However, I did mill out the inside of the heavy/high side of the domes ( about 25 grams ) of them, so to help avoid piston "rock". I also removed excess material from the pads on the rod caps ( just makes them lighter ), then balanced the whole thing. Cylinder bores are far from "race prepared". There's some taper, there's a few light scratches, so it develops a little crankcase "pressure" under high load ( a good test for the unique oil shield under this manifold ).
How high RPM ?
Well, the road test made it obvious that it better see 6500+. Peak may be around 6000... but it doesn't lay down after that.
Because this manifold was never intended to be a low end torque builder, it's likely that the "pulls" on the dyno won't start until 3000.
I should say that I'm not expecting to make impressive power with this thing. The goal here, is to provide factual, accurate data, comparing the three different manifolds... with all else being equal.