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Message: <blockquote data-quote="Purple97GT" data-source="post: 233966" data-attributes="member: 9882">I run a full PI crate motor from an 04 Explorer. They have stock comp of like 9.6:1. With the follwing mods and on stock street tires, I run 8.7x's and 13.5x's as long as I cut 2.04x 60ft's.Engine Mods:2004 Aluminum block PI swapBBK Shorty headersMAC ProChamber o/rMAC Flowpath 3" catbackBBK CAIPro-Flo 87mm MAF for 19lb hr injectorsBBK 75mm TBFord racing aluminum driveshaftFord racing 3:73 gearSCT Xcal2 mail order tune from Dynospeed RacingSo if you do a PI headswap, which on a NPI shortblock makes like 10.5:1 I think it is, and match my mods, you'll be running faster than me. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />J/Y is full of Ford PI motors, so the heads should be dirt cheap. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>