Do I Need Stiffer Valve Springs?
 

Looking to install 4K GSK in place of my 3K and I was wondering if I needed stiffer valve springs, and if so, what size?

Thanks!

i use the 60 lb springs. :tu:

pacbrake 60lb valve springs are a good idea past 3200.

here is my set up going back in after i got a ported head from enterprise. we used the 60# valve springs, a cummins brand gasket, mahle pistons, rod bearings and mighty diesel head bolts.

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motor looks fresh tony

yeah i went with this new head and big bowl pistons. honed cyls a little too:hellox:

Nice tony... still gonna use ur head bolts? I'm all done with June working great thanks again :c: but to answer the question yes use 60lbs springs and since ur in that area I'd just do all 12 springs ..

Ok so I had someone tell me that I need all 12 60PSI valve springs...because they said it will float a valve on the intake side. If true, that blows because I just ordered 6 for the exhaust side last night. Someone please either confirm or disprove this!!!

You can float an intake valve, however, since the piston chases the exhaust valve shut, that's really the only side that NEEDS it.

that was me saying you need 12 because rpm is what floats them.