So I don’t step all ove Early A’s Speedmaster head testing I figured I would keep this separate. I had bought a couple more flex homes from Amazon in hopes of shortening the time I have invested in tubing a set of heads. I wanted to try an 80 grit but honestly I’m still probably spending 15-20 minutes honing the two head bolt holes (easy) and the 4 pushrod holes. Whatever they use to cut these holes in leaves a very tight fit on the cut-away to end. You are probably better off taking a 3/8...
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