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  1. GN7 On the Dyno
    I have a chance to buy a 10.2 mark IV 4.5 block form a freind. It was used in a 1200 or so hp procharged boat motor. It needs most if not all of the head bolt holes helicoiled. Is it still reliable after helicoiled and does anyone make a blind insert instead of a helicoil? I plan on using...
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