Yes I had the head drilled to match the block water passages.
Maybe I'm using the wrong word but like the 235 & 216 blocks, The oil still had a bypass. Only a percentage of the oil went through an oil canister mounted on the manifold. By adding a block in the oil gallery, diverting all the oil, using larger hoses out & into a spin-on type filter, all the oil gets filtered.
It's been years now, I don't remember if it was Patrick's or Langdon's Stovebolt 6, I believe Landon had an article on building a 261 for performance.
It's all over my head so I had a local engine shop build the long block.

Last edited by OLDSCHOOL CHEV; 12/13/2016 8:18 PM.
Darrell, W.L.
1939 Chevy COE tow truck/My Stubbed toe
1939 Chevy 2 door Sedan

Car chat means talks about Chevy's. All other car makers only build transportation.
I don't work on my cars, I entertain my self in my garage, so my nabor tells me.