I tried it with methanol and blew the head gaskets between every bolt on the first hit and they were multi-layer steel. We now build most engines with High boost with the heads o-ringed. Every diesel done here is o-ringed. I'll go get some pictures I believe there is over 10 in the shop right now. Big blocks are O-ringed and cross bolt mains like a hemi or the block with spit up through the mains. Just got one that was split.