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Message: <blockquote data-quote="96blak54" data-source="post: 1371454" data-attributes="member: 14727">This much water capacity could benefit any modular build especially a 5.4l. Although ive never heard of any problems when using a coolant mod with normal 4.6l heads, these 5.4l heads are the ticket for the performance build.The coolant mod refers to a machined pc designed to slip into the freeze plug location on the rear driver head. This allows trapped water around cylinders 7&8 to flow out. In turn equalizing both banks cooling properties.<img src="http://images.tapatalk-cdn.com/15/12/28/9ec9da86d69d122c38243c7abe72f081.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This pic refers to the "crack pipe" version. This is a lincoln continental pc from the dohc 4.6l fwd engine. You can see the modifications needed for sohc. Real simple. The out put can either be plumbed into the line for the heater core or routed to the crossover on the intake. Basically opening the area for water to move.</blockquote>