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ProMaxx Performance Products, Maxx 290 Oval Port, Chevrolet Big Block Aluminum Heads
The Maxx 290 is truly a rare breed. An As Cast head that is just as efficient as competition's CNC ported pieces. Independent flow bench testing shows over 375 cfm. This head will change the industry. Compare to any brand, this head makes power! Ultra smooth casting made of Grade A 356-T6 aluminum is precision CNC machined. 5 angle competition valve job, diamond honed bronze guides, hand bowl blending and assembly by professional builders. Available assembled with 2.250"/1.880" stainless steel valves, HP valve springs (1.500" hydraulic roller up to .600" lift, dual 1.550" mechanical roller up to .700" lift or triple 1.600" mechanical roller up to .800" lift), 7/16" screw-in studs, and guide plates.
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