Originally Posted by
WyattV8
A lifter bore that is out of round and/or has clearances larger than the lifter indicates excessive wear.
Offset lifters are used with head and/or rocker combinations that require the pushrods to be set away from the intake ports or for any other side-to-side clearance issues. The offset has nothing to do with the tie bar in between the lifters. The lifters have offset pushrod seats left or right for the intake and/or exhaust, or any combination needed to gain clearance. -Crane Cams
That helps,thanks 
2002 GMC 1/2 ton Sierra,4WD, Xct cab, camed, mid-length headers, Nelson tune, electric rad. fan, trany cooler, Heavy 5750 lbs with topper.
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