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I neither milled my my block or head and use a Mitsu metal HG with copper spray. Didn't leak a drop doing many runs at 30 psi. YMMV.
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2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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