First off, the 402, is just a 396, bored .030 over. The HP rating will be aroun d 300, to 325. It is a torque motor, more than a horsepower motor.
how much horse power does a stock chevy 350 have ?
find a good big block Chevy engine and install it.
496 Cubic Inch Big Block v-8 340HP 460 Lb-ft Torque
I think it is around 160
Timing to high / advanced to far. Idling to fast. This can cause that problem.
170hp
375
303 HP
200
The 400 Chevy small block motor should have approximately 390 horse power. It should have 427 foot pounds of torque.
that all depends on the year of the engine.
Need to know the year of engine, and what it is in. NEUTZ.