What Is Ultimate Duty?
Howards Racing Components developed these connecting rods to fulfill the needs of the hardcore enthusiast. Designed to handle 1000+ horsepower in a 4 cylinder application these truly are ultimate duty connecting rods! These new Rev 2 rods are made from aircraft-grade 4330 vacuum melt material, which has less carbon and is cleaner and stronger than 4340 grade steel. They also use Ampco 45 pin bushing material, which has a higher load bearing capacity and is suitable for extreme pressure applications such as nitrous and large turbos.
Designed for use with the earlier "6 Bolt" rod bearings for more load capacity, these connecting rods fit most readily with OEM Mitsubishi cranks. For proper fitment of the rods, chamfering of the bearings will be required when used in conjunction with an aftermarket crank. Please consult with your engine assembler.
Important Note: In order to increase bearing surface area and load capacity these connecting rods utilize rod bearings from the 1990-1992.5 6 bolt 4g63 (ACL Part # 4B1146H). ALSOÂ These rods my not fit some pistons because of the upper rod Wight. Check with piston manufacturer before buying.