Fullpower

4.8 LS with TVS1900, 6.5 PSI boost.
Fabricated catch can from Liter aluminum water bottle, simple two port with screen in middle, and threaded cap for DRAIN.
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Question: Should I use the modern 'fixed orifice' or the older spring loaded rattle style PCV valve ?
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Why did factory change to the fixed orifice in 2004, after 40 years of the floating check valve PCV ?
Just because cheaper, or is there valid engine friendly reasons for the fixed orifice ?

Ford_Assassin

iTrader: (2)

A regular style PCV valve squeals like a belt with any PD blower setup I have done. Straight vacuum seems to work well.

Fullpower