cut the rear mounting holes at the bottom so they're slots instead of round holes then the bracket will be higher in the back.install flat washers to hide the slots..the older engines that had the high bosses on the head tend to warp and the bosses fold over and won't stay tight.[the high boss head is no longer available].the low boss head and stud package is the replacement that fixes this problem ...make sure you torque the nuts against the head with flat washers then spacers then tank bracket and make sure the studs have clearance at the tank or they will damage the tank...the tin over the head also came with the new head kit which came with all the studs,nuts,spacers etc. it's the same tin that came on 108/128 engines
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