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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. View Related Article
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