EJ253 This engine was rated at 162 HP at 5,600 RPM and 167 lb-ft of torque at 4,400 RPM. Unlike the EJ251, the one it replaced, the EJ253 intake volume is measured using a MAF sensor. I-Active valves (VVL intake side) on 2006 models have 175 HP rating at 5,600 RPM and 169 lb-ft of torque available at 4,400 RPM. At just $3,500 to $7,000 the cast-iron small-block engine puts out 357 HP and 407 lb-ft of torque and fits in most trucks and larger sedans. Via: CorvSport. The SP357 is a pretty significant upgrade from the base SP350 with an included intake manifold, distributor, damper, and flexplate all included.