Big Bore small stroke big block chevy
I am looking at building a new chevrolet engine for my pulling tractor. Before I get into it and get told "oh no for pulling you need lots of torque" let me explain. With the clutch and driveline setup we have we can leave the line at 6000+ rpm with no problem and probably will never drop below 5000 rpm in a run. Now my idea is to start with a dart big M block and bore it out to 4.6" then run a 3.76" stroke crank. (499 cubes when limited to 502) The only issue would be the heads. We are limited to OEM heads which would mean rectangular port GM cast iron heads. Would I be able to get enough airflow through them to make power at 9-9500rpm? What do you guys think? Would this engine combo run better than an exact match 496 (4.310X4.250) or would i be wasting a lot of money to do it?