The Stovebolt Site Forums The Shop Area Engine Shop 261 steam hole questions

Here is the Chevrolet description/introduction of the 261 engine. The siamesed cylinder-bores and six additional coolant passages are described.

It makes me cringe (but, I'll get over it) when the expression "steam holes" gets used (thanks, I think, to an old Tech Tip by Jim Carter). I doubt if GM designed an engine to have steam running though it.