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The next step up Survival's cylinder head food chain comes from Blue Thunder, in either medium-riser or high-riser configurations. Again, these are likely way beyond the scope of a 445-relevant discussion, but are pretty much the top dog in FE race applications. Their chief advantage is huge flow capacity-out of the box, they'll flow considerably better than even a fully ported Performer RPM-but because of port positioning they are incompatible with either stock or common aftermarket FE intake and exhaust hardware. Once ported, they can easily support upwards of 900 hp.