Worth every penny in my opinion. Could have gone el cheapo but i love my truck. Put this in a 2007 gmc sierra vortec max 6.0. Oil pressure would start at 39 and when fully heated on idle it was at 10-15. It was horrible to see. This starts me at 64 oil pressure and idle at 39 when fully heated. When i punch it she goes to 72. Amazing. Use the biggest spring. Already put 1000 miles on it and ita holding well. Im a diy mechanic. Took me a while to install. Harmonic balancer is a pain. Went ahead and did new timing chain and tensioner and of course ac delco. If you have a gm dont cheap out. She will appreciate well made parts. Truck runs better than ever!!