low temp Hi Compression

I never thought of it this way before. What am I missing? My intro to factor high compression was the LT1 reverse cooling. 10.5, 11:1. I figured it was higher temps and this is why. It appears I am wrong. I'm here to learn, could I get some clarification guys. What am I missing, thanks.

What is your actual query?

I'm not clear on the question yet either, but eager to help. Please let us know how we can help Ernest.

Re-reading it, I think he's asking if GM introduced the reverse flow to reduce cylinder head temperatures, and if the higher compressions used on those engines was a factor?

I did know, but that was years ago - I think it was largely emissions related, as it allowed the engines to be run hotter and leaner, which improved efficiencies?

Ah, seems a bit of both - better cooling allowed a higher compression ratio and/or lower octane fuel to be used.

Seems the LS went back to the original - maybe the difference wasn't as marked as thought?

Wow, well done Gord. While higher compression does generate more heat, the target coolant temperatures on newer engines have also been increased to improve efficiency and reduce emissions, so the higher coolant temps aren't so much runaway heat from higher compression as something allowed on purpose, just in case that helps add more info. Coolant system rework to allow for higher heat without harmful results makes sense to me.