Once the bottom end is done, which takes up most of the build time, things speed up. The oil pump used in the 406 is a standard volume Melling oil pump. The two-piece Comp Cams timing cover that is being installed in this photo is for the test build engine. The two-piece Comp Cams timing cover that is being installed in this photo is for the test The Canton oil pan has a seven-quart capacity. Jenkins and Smeding talk shop as Ben works on a set of cylinder heads. The top half of the engine consists of AFR 195 cylinder heads with 65cc combustion chambers. The top half of the engine consists of AFR 195 cylinder heads with 65cc combustion chamber The lightweight intake valves measure 2.050-inch and the exhausts are 1.600 with hardened ductile iron interlocking valve seats. The intake used is an Edelbrock Super Victor topped with a Quick Fuel 750 cfm double pumper. The lightweight intake valves measure 2.050-inch and the exhausts are 1.600 with hardened Once the engine was on the dyno and the rings were seated, a few different tests and parts swaps were conducted. Once the engine was on the dyno and the rings were seated, a few different tests and parts After we left Smeding Performance, they tried one last dyno run this time with a highly-tuned 850 cfm Quick Fuel carb with the Professional Products Hurricane intake. Ben informed us that the Quick Fuel carb was within 4 horsepower of the Mighty Demon. As for the final production version of this engine that hits the streets, well, that is up to Jenkins and Smeding. After we left Smeding Performance, they tried one last dyno run this time with a highly-tu Dyno Test 1 Maximum HP Maximum Torque 526@5,800 RPM 519@4,800 RPM Parts list: Edelbrock Super Victor single plane intake, Smeding rocker arms, AFR 195 cylinder heads Quick Fuel Technologies 750 cfm carb and MSD Pro Billet distributor. At lower range between 2500 and 3000 rpm, the engine torque starts between 431 and 458 ft-lbs and quickly accelerates from there until it hits its peak. Dyno Test 2 Maximum HP Maximum Torque 554@6,100 RPM 535@5,000 RPM Parts list: This test consisted of the same exact parts as in the first dyno test with the exception of the carburetor. A highly-tuned Barry Grant 830 cfm Mighty Demon annular carb was swapped in place of the QFT 750. The torque gain was 28 ft-lbs and the horsepower gain was 16. Dyno Test 3 Maximum HP Maximum Torque 549@6,000 RPM 532@5,000 RPM For this test, the Demon carb was kept and the Edelbrock Super Victor was swapped in exchange for a Professional Products Hurricane intake. The results were nearly the same, minus the 5 hp loss and 3 ft-lbs of torque lost at peak. SOURCES Air Flow Research 10490 Ilex Avenue, Dept. MMFF Pacoima CA 91331 Edelbrock Dept. 5.0 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com Barry Grant Demon Carburetion Quick Fuel Technology Bowling Green KY 2-70/-793-0900 quickfueltechnology.com COMP Cams Smeding Performance Dept. MMFF 3340 Sunrise Blvd. Rancho Cordova CA 95742 Dart 2-48/-362-1188 www.dartheads.com « | 1 | 2 | View Full Article By Mike Harrington Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!