ORIGINAL: Big_Bird
I have been using 1" red oakdowels to support a ZDZ80 engine on a 1/3 scale Super Decathlon for 5 years. I did cap the ends with steel washers. I don't know if that was necessary. I did build in a 2 degree slant into the dowels for engine offset. They are very light and have nevercaused any trouble.
Do yoour bolts go all the way through to nuts behind the firewall?