NEWS FLASH: Enthusiasts are still building big power from old-school small-block engines.
With 436 ci, natural aspiration, and EFI, the project engine we’re going to discuss in this story spun to 7,300 rpm and lit up the dyno with 708 hp and 614 lb-ft of torque. That was with a comparatively small camshaft and a pump gas–friendly compression ratio.
Those peak numbers are impressive, but perhaps more so was the fact that its glorious, neck-tugging torque came in immediately in the powerband: 451 lb-ft at only 3,500 rpm. That’s only 19 lb-ft short of the factory LS7 engine’s peak torque of 470 lb-ft, which occurs at 4,800 rpm.
Comparing this small-block, which was designed and built by John Lohone, of Michigan-based Valley Performance, with the vaunted LS7—the naturally aspirated king…