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We have run stock internal LS motors up to 15 psi and they lasted a while but eventually they cracked a ring land or two. I would say that if you are planning on staying below 12psi then youll be ok as long as you take the time to get it tuned properly. I forgot to look where you are from but if you are near Pa then bring it on up to our shop and ill get you some time on our dyno. I chose the Skuink manifold because it is a little better than the stock one. I recently scraped that for a sheetmetal one but I had no complaints about the Skunk2 manifold. It seemed to bring out the mid to top end more.
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