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What are you running for upper valve train??
Like said above, even the old 427 cams weren't over .500 lift.
Stock shafts don't seem hold up. Atleast be sure to use end supports.
Broke mine with a Crane .533/.563 lift.
Have since went with Ersons from DSC.
http://www.dscmotorsport.com/asp/Pro...asp?PartID=516
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FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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