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Premium alloy: Dart aluminum heads are cast from virgin 356-T6 aerospace aluminum alloy for superior strength and integrity.This precision casting technologyduplicates the contours that were previously available only in hand-portedcylinder heads.
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Using advanced manufacturing techniques, we cast the PRO 1's ports with incredible accuracy. You get more power for your moneywith PRO 1. Inspired by our championship-winning Pro Stockdesigns, the PRO 1 's race-proven features include rolled valve angles, improvedspark plug location, extra-long intake valves, raised exhaust ports, andfast-burn chambers - yet the PRO 1 can be used with off-the-shelf pistons, valvetrain components, and intake manifolds.
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PRO1 aluminum big-block cylinder heads deliver "out-of-the-box" airflow that beatsthe competition - at an unbeatable price! Specifically designed forperformance marine engines, PRO 1 heads make Pro Stock airflow technologyaffordable for every big-block owner. These heads are sold as heads w/valves only or completely assemble with inconel exhaust valves & dual valve springs. All heads have a Dart Marine exclusive chromate finish that provides a superior corrosion resistance extending the life of the heads in a harshest of marine environments. These are available in three upgraded intake runner sizes 310CC, 325CC or 345cc ports. Dart Mercury 525, 600, 700 EFI Aluminum PRO 1 Cylinder Heads - with Valves Only (Pair)ĭart machinery has just introduced the ultimate Mercury Racing replacement aluminum cylinder heads for the Mercury Racing 525, 600, and 700EFI engines.