Hi,
Trying to find the correct prop drill pattern for these two engines and the diameter of the bolts

Thanks

The GP 76 bolt pattern is the same as the DA 70 and the GP 38 is the same bolt pattern as a DA 35. The 76 uses 5 mm bolts and the 38 uses four mm bolts. I have both the DA and GP engines. The GP engines run great and have lots of power.