The ZZ383 uses 1.5:1 versions of teh same 1.6:1 roller rockers the Ramjet 350 uses. The ZZ383 is rated at 425 hp 5400 rpm and 460 lb/ft of torque at 4500 rpm. 461/.481".įor the ZZ383 which uses the same shortblock as the HT383, but uses the 210cc intake port Fastburn Vortec style heads and their 12370846 roller cam with 222°/230° duration at 0.050" with lift of. This is the same cam that is used on the Ramjet 350 crate but in that setup its used with the 1.6:1 roller rockers for. It is rated at 340 hp 4500 rpm and 435 lb/ft 400 rpm. The HT383 that GM sells uses a 196°/206° duration at. I like a cam with around more exhaust duration at 0.050" than the intake. The Vortec ehads dont really flow much more at lifts over.
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