With the ultimate rod ratio in a 302 stroker the 1.696:1 331 stroker features the same offset wrist pin design as the venerable 347 Street Fighter. It is also benefited by the 1650 gram (approximately) bob weight, making this stroker one of the best street and strip engines of all time. 331ci Street Fighter Pro Street 4.000 to 4.040 bore - 3.250 stroke - Flat top piston • Ford Racing 302 roller block • Forged steel crankshaft • CHP 4340 forged steel connecting rods • Probe SRS forged pistons • Dished and Blower Dish pistons available • Clevite plasma moly rings • Clevite bearings • Balanced & blueprinted • Your choice of 28oz. or 50oz. fully assembled