273 commano on the dyno wooooow
Problem with the 273 is that it has a long stroke and small bore which hurts cylinder head flow and you can’t run a 2.02 intake without notching the bore in the block. Even then the bore is so close to the valve that it hurts flow by a lot. An all out motor with really high compression and huge camshaft will have trouble making 450 even if your able to rev it to 8k.
LOL, 3.31" isn't in the "long stroke" category, and it's still an over-square engine. Try to get sympathy from a slanty racer 3.5" hole & 4.125"swing !!! SB Mopars have a
nearly ideal placement of valves in the chamber/bore for an inline-valve arrangement. True small bores can restrict flow, but are more resistant to detonation, so You take
advantage of every little gift each particular build offers to the max. It is also not 100% true that heads that flow enough to make 400hp, will do so no matter what the
displacement, there are frictional losses that go up exponentially with RPM, as well as the inertial loads/losses Energy=Mass x Velocity sq. it's not a free ride to 10K just
'cause the heads say they can take You there!! In this sense, You're correct. To obtain that output at the needed R's, a reduction in stroke would be needed to offset the
new demands of such an increase in inertia, and help slow the intake velocity for a given RPM as well.
