I installed this oil pump on a friend's 2009 Chevy truck with a 5.3 liter engine. I used a spring that was already installed. His pressure rose about 5 psi. This is a real grinding pump. Made in the USA. It has a Texas camshaft. Delete DOD. I would only use a higher pressure, higher volume pump if you are going to stick with a VVT or DOD system. Otherwise you waste PS. imo
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