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Kilohertz · 01-15-2021, 07:31 PM

Excellent! Thank you for the detail boys, much appreciated.

That chart is great, glad my engine came with the EAB heads. I still might look for aluminum "speed" heads but happy for now with these.

Now I need to figure out why I am only getting 40-45 PSI cranking compression. This probably is also why manifold vacuum is only 16 "Hg. This is cold, the engine hasn't run for more than 30 seconds at a time in the last few weeks and I don't know when it was last run long enough to open the T-stats. I am building an exhaust system for the shop this weekend to extract the fumes from the headers so I will be able to run it long enough to warm up.

Cheers

01-15-2021, 07:31 PM	#11
Kilohertz Senior Member Join Date: Jan 2021 Location: Slightly left of Vernon, BC Posts: 155	Re: Identifying a Cdn Mercury Flathead Heads Excellent! Thank you for the detail boys, much appreciated. That chart is great, glad my engine came with the EAB heads. I still might look for aluminum "speed" heads but happy for now with these. Now I need to figure out why I am only getting 40-45 PSI cranking compression. This probably is also why manifold vacuum is only 16 "Hg. This is cold, the engine hasn't run for more than 30 seconds at a time in the last few weeks and I don't know when it was last run long enough to open the T-stats. I am building an exhaust system for the shop this weekend to extract the fumes from the headers so I will be able to run it long enough to warm up. Cheers Last edited by Kilohertz; 01-15-2021 at 08:22 PM.