Even though experienced engine builders can come up with some fairly accurate engine output estimates, until an engine is actually mated to an engine dyno, all horsepower and torque figures are purely speculative.
Right off the bat, the 468-cu.in. Pontiac sounded healthy as the break-in allowed the new parts to familiarize themselves with one another. And once the pump was put to work, we witnessed some eye-opening numbers, with only a few minor changes to timing and jetting. Horsepower figures were impressive, as the engine churned out nearly 550 asphalt-stompin’ horses while spinning 5,200 rpm on the SuperFlow 901 dyno.
Even more impressive, however, were the flat-as-a-table torque numbers, which were nearly 625 lb-ft from the beginning of the pull at 3,500 rpm, peaked at 635 lb-ft at 4,000 rpm,…
