Hot oil and a somewhat cooler engine coolant temp when using iron heads usually makes for better HP numbers. But when testing, I do try to keep the oil and water temperatures constant so that other changes can be more accurately evaluated. 155°F is a good all around coolant temperature for testing so that’s what I used for the EMC combination here at the shop. I didn’t have any control over the water temperature at the EMC competition and each consecutive run was getting cooler. The best numbers at the EMC competition came from the coolest run.
In reviewing the shop dyno data for the EMC engine, the score was 2117.3 (167.8 points higher). As it stands now, the EMC engine is a good blueprint for a very stout street engine that’s not so roudy that it’s difficult to drive around and does it well on 91 octane fuel. But head flow is limiting its use as a 7000 rpm race engine though.
Lorena, Texas (South of Waco)