TO refresh your memory from last issue, the SD-455 that you see before you belongs to HPP contributor Melvin Benzaquen. We were using it as a mule for a fuel-injection swap into his '74 T/A when it expired on the chassis dyno during baseline testing. Cracking open the famed powerplant revealed a poor rebuild was the root cause of the engine failure.
Presented with the opportunity to rebuild the engine as well, the owner decided to upgrade the powerplant for reliability and employ some modern technology, so he sent the engine to RaceKrafters. That quest began in Part I with basic machining using state of the art equipment. Cylinder-wall finish and the valve-job procedure were notable technological improvements, fully explained in the first installment to go along with the basic machining and cylinder head porting.
In this issue, the engine will be assembled, and a Comp Cams hydraulic roller cam will be employed to exploit its advantages, such as lower friction and more aggressive ramps to open and close the valves more quickly by realizing more lift per degree of rotation. Craig Wise of RaceKrafters did all of the assembly work. He showed our Pontiac the same care and execution to detail that would be provided to a 1,000hp drag engine.
In the next installment, HPP will work with RaceKrafters to dyno test the engine with a carburetor and then with the high-tech EFI system from Mass-Flo EFI, but first we need to get some wrenches swinging!