Milling of a 810 casing W-2 head

That’s true. Racers screamed for a closed chamber for quench and a easier route for higher comp. Now try and find low compression forged slugs for a supercharged engine. LOL!

Ether way, in building a W engine, who cares about mileage and fuel concerns? It’s a fresh build and you will build accordingly. Compression builds torque and HP but without a decent ratio for use with an increased cam duration, the engine becomes less efficient and effective.