Right now I'm running 99893 springs with the 846 cam and I'm thinking about puttin in the 847 cam in my car. Will these springs go to 6800 without valve float? The springs only have 5-10k miles tops on them so I would rather just leave them in if I could and save the money.

 

If I'm not mistaking those are the springs Crane recommends for the 847.

 

Heres the cam card from crane
http://www.cranecams.com/?show=brows...tType=camshaft

They say the 99846's

 

For stock spring pockets yes. For heads that have been setup to accept a larger spring diameter the 99893's are recommended.