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I have a almost complete 2003 motor in my garage on a engine stand. The heads are different. 123 head chain tensioner is on the bottom the 456 head its on the top. The AOS connection on 123 is different than the 456 head crank exhaust port. I have a complete set of 2004 heads off a 3.2 they look almost the same and also could not be switched for the same reasons.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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