this is a video of how I ported my 317 casting number heads that I am putting on my 4.8 liter twin turbo setup in my 1983 ltd sleeper wagon build they have a 2 inch intake valve instead of a 1.89 but I don't think there is a lot of difference for 5.3 and 4.8 heads aside from that . I am not a professional I could have done some of it wrong

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