Here I must sadly admit shameful ignorance, my peers.

This is what wikipedia says about "Volumetric Efficiency" (comprehensive)

"With proper tuning, volumetric efficiencies above 100% can also be reached by naturally aspirated engines. The limit for naturally aspirated engines is about 137%[1]; these engines are typically of a DOHC layout with four valves per cylinder."


I think I just busted my lower jaw when it hit the floor...


Do you understand what "Naturally Aspirated" means?
For future reference: NO Turbo, NO supercharger. Plain old intake, whether EFI or carbied....

I don't know if RAM AIR counts... I'm thinking you can only take advantage of ram air with an EFI setup and mass airflow sensor

More progress - but I suddenly realised I ditched the stock heads for the windsor months ago. These are the terrible twins, pick your favorite flavor!


The reason the M block looks so much heavier is NOT because of the heads on it.
Eyeball that timing area and compare to the W on the right