orcardo0 wrote: ↑Sun Jul 07, 2019 12:23 pmJust my opinion but my expectation is while cubic inches are lower for a shorter stroke the hp/ci goes up. Maybe not in proportion but a shorter stroke on the same bore can allow a flatter piston with a smaller head chamber for greater efficiency.
The SCCA Trans-Am series in the 90's used 310" motors making over 600hp using domed pistons and 13:1 compression. Myself I don't see any need for over 500hp in a street car. And reduced torque increases the life of the trans + rear end I would think.
But on the other hand I don't read much about big-bore short stroke motors. A little published on the 4.155" X 3.25" = 350ci combo but this is first time I read of the 4.155" X 3.00" = 326ci combo. I am interested as I have 3 standard bore 400 blocks waiting their turn. Interested in what size cam for something like a 4.155" X 3.00" combo? How much lift do your really need for a shorter stroke motor? "That science is beyond me but would like to hear about it from others with that experience. And to stay on topic here how much lift does a 3.25" stroke sbc need? Meaning is lift over 0.55" gaining anything on a short stroke motor?
Lets hear it!
The race motor, 4.155 x 3.0 I am quite sure has over .600 lift and a lot of duration, but will have check the cam card this week.
It has Dart block Little M, Callies magnum crank, Carillow rods and JE pistons if I remember correctly. The heads are old Brodix -8, pro ported, Brodix intake with Bo Laws 750 carb. Solid roller comp cam. It made about 520 HP and 410 torque. The car is a tube frame 1968 Corvette and weighs about 2600 with lead and driver. Performance is similar to the Trans Am 2 cars.