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A top-tier hop-up package for the 212cc Predator Hemi engine, aimed at experienced builders. It pairs a ported and milled head at about 10:1 compression with stainless 28mm intake and 25mm exhaust valves, 37lb springs, 1.2 ratio billet rockers, chrome moly pushrods, the 280-0611 cam, a long billet rod and a full gasket kit. Predator rates it at up to 20hp or more, which puts it above milder Stage 1-3 kits that stop short of head work and valvetrain upgrades. It is not a bolt-on: clearancing and fitting are expected, and it will not fit non-hemi blocks.
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The Stage 4 speed kit is for the Predator 212 hemi engine. It is built on the Stage 3 kit and adds a ported and milled hemi head, stainless steel valves, billet rocker arms and a camshaft package. It allows up to 20 hp or more.
The kit is made for experienced engine builders. Some clearancing, fitting and other engine building techniques may be necessary. It does not fit non-hemi Predator engines.
The air filter should be sprayed with K&N-type oil, especially for dirt applications. An aluminum flywheel is required, because stock flywheels are prone to failure and can be very dangerous. A flywheel and a carburetor are available as options.
