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Ported LSJ cylinder head
I had purchased the ported cylinder head with dual valve springs and over-sized valves almost 6 years ago. It has and still is a great product. I have been running it for 5 years on 20lb boost, and it has been great. The customer service is also top notch. I have emailed about questions that did pertain to my purchased products; and they gave answers. If you are looking for ecotec knowledge and great parts for them deal with ZZP.
Great product and upgrade! I bought the Inconel valves and supertech 75# springs before I bought the head thinking I could just buy a bare ported head just to find out that you cannot buy a bare ported head. It worked out because I **** you not a day after they offered the supertech 75# upgrade option for only fifty dollars extra so I returned the valves and springs so I went from paying what the full price of the supertech springs was to just doing the fifty dollar upgrade option in the dropdown option and saved a couple hundred bucks! Buy again? Yes
2007 LSJ - Stage 1 Port Job
Marked installation as moderate because the job itself isn't hard nor easy i'm fortunate that i'm a auto technician at a chevy dealer and have access to a lift rather than doing this in my garage (been there done that) but more so because of the time required to perform this upgrade. Another solid product from ZZP. Must have to let that car breathe. I also have the ZZP Stage 2 cams and now with the added ported cylinder head you can definitely feel the power increase.