8500 every pass with 360 bored .100" over. Light pistons and aluminum rods. Tube in the block with crane rollers. We heads and Harland sharp rockers.
That's 3.58 stroke cast crank. With a 3.31" stroke steel crank with 2.25" mainss it's not even a challenge to turn that rpm. Make power at 8,000 and up with 3.910" bore and stock configuration heads. There's your challenge.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
