Call it what you will, the 8100 was the result of GM bumping the Vortec 7400/454's 4.00-inch stroke ... valvetrain and intake-manifold upgrades and even a line of Big Power aluminum cylinder ...

Both feature 64cc chambers along with 2.00-inch intake and 1.55-inch exhaust ... See All 30 Photos Surethis is a carbureted 4.8L Vortec (that had a cam upgrade), but the results would be about ...

GM's first-generation Vortec engine was derived from its fuel-injected predecessor, the throttle-body fuel injection (TBI). Both the TBI and Vortec engines used only two injectors to supply fuel ...

Call it what you will, the 8100 was the result of GM bumping the Vortec 7400/454's 4.00-inch stroke ... valvetrain and intake-manifold upgrades, and a line of Big Power aluminum cylinder heads.