Check my thread. I just changed the o-rings only without removing the manifold
http://www.peachparts.com/shopforum/showthread.php?t=162751

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85 300sd 400k
99 e300td 101k (hers)
34' californian twin 5.9 cummins
1999 F350 Powerjoke 75k
2001 F150 Supercrew 51k
19681/2 GT/CS