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Lifter preload?

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Old 06-03-2010, 07:21 PM
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Default Lifter preload?

ok i just finshed building my forged 347 and now i just installed my scorpion 1.7rr's and iam coming up with 1 3/4 or a turn to 22 ft lbs. does that see like to much lifter preload? or do i need shorter push rods?
Old 06-03-2010, 07:45 PM
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1 3/4 turns is at the maximum of the range, 1 1/4 being minimum. This assumes OEM lifters (LS1/LS7).
Old 06-03-2010, 07:58 PM
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i got comp r lifters
Old 06-03-2010, 08:27 PM
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At 1 3/4 turns you have .082 preload.

Do you know your target preload?

Comp recommends adjustable rockers for those lifters presumably because their required preload range (minimum - maximum) is narrow.

Added:
Additional research indicates that Comp calls for a preload of 0.002 to 0.0004 inch. Some folks report satisfactory results using 0.010 inch and others have run preload based 3/4 turn. Thus, these lifters are designed to use adjustable rockers, but in any event the current 1 3/4 turns of preload is too high and you need 0.075 inch shorter push rod.

Last edited by Darkman; 06-03-2010 at 09:13 PM.




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