1g 12mm x 1.25 threads.
2g/7g 11mm x 1.25 threads.
1g head bolts will not work on a 2g/7g block. When the 1g 6bolt 63t guys use 2g heads, they have to drill the head to fit the 12mm bolts. But when using a 1g/2g DOHC head on a 2g/7g block, I dont think we have to do anything but use the 11mm 1.25 head bolts.
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