Made something like 430HP, if I recall correctly. This engine promised excellent torque based on the success we witnessed with Tim Moore s 355ci Vortec heads and Hot hydraulic-roller cam equipped small-block, which made 422 hp with a single-plane. And that engine WOULD respond to bigger cams like the LT4 HotCam because it had enough flow capacity to support making power higher up the RPM range.Īnd finally, GM built the ZZ383 which was those better FastBurn heads, a special cam (bigger even than the LT4 HotCam) and, of course, with 383ci of displacement underneath it instead of just 350. Copied from an article by Matt King of Hot Rod Magazine: 'GMs ZZZ 350 H.O. Literally exactly the same as the ZZ4 but with different heads on top. Worked well enough they sold it the next year as it's own crate motor called the FastBurn 385 (indicating it's HP, not it's displacement). That picked up 30HP and 7 ft/lbs of torque with no change to the cam. They also had a package where they swapped the stock ZZ4 heads for a set of FastBurn heads. It made 3 extra ponies and lost 2 ft/lbs of torque. One package was a ZZ4 that they installed the LT4 HotCam into. Here's the summary straight from the guys who designed and built the ZZ4. GM offered "power packages" for the ZZ4 in their catalog (maybe still do?). Im just not sure if the valve train would all need upgraded or not. It's not easy to swap cams and pick up a pile of easy ponies. evidentally with the hot cam and the 385 gm engine you get about 420hp from what Ive read on here and other forums, im thinking about the comp cams 08-2432-8 (xe272) roller cam. The ZZ4 cam is REALLY well matched to the ZZ4 heads.
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