Holley 4160 power valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 01-25-2004, 07:57 PM

How would you adjust a holley 4160 s power valve?

Thanks

tom hand · 01-25-2004, 08:09 PM

They are rated in inches of vacuum...you just replace it with one with correct rating for your cam. I think you want it to open at 2 inches lower vacuum than what vacuum your motor idles in gear....for an automatic...they are more forgiving for a standard trans.

67dragtruck · 01-25-2004, 09:20 PM

tom hand is correct. check your manifold vacuum with it in gear if auto and go 2 numbers lower. This is one adjustment that can really make a difference in the part throttle response.

Tom

01-25-2004, 07:57 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Holley 4160 power valve How would you adjust a holley 4160 s power valve? Thanks

01-25-2004, 08:09 PM	#2
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	They are rated in inches of vacuum...you just replace it with one with correct rating for your cam. I think you want it to open at 2 inches lower vacuum than what vacuum your motor idles in gear....for an automatic...they are more forgiving for a standard trans. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

01-25-2004, 09:20 PM	#3
67dragtruck Registered User Join Date: May 2001 Location: Bethlehem, GA, USA Posts: 389	vacuum tom hand is correct. check your manifold vacuum with it in gear if auto and go 2 numbers lower. This is one adjustment that can really make a difference in the part throttle response. Tom

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