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Motor Mission Steals 700 Horsepower from this Littlefield Blowers force fed big block Chevy engine that powers around a street driven 1941 Willy’s coupe. We performed all the machine work on the engine block which included machining it for 4 bolt splayed Milodon main caps and ARP main studs. We then line bored the housing bore (mains) on our AMC line bore. The block then went into our Sunnen line hone to get the housing bore (mains) align honed to their final size. The block was then secured in our Rottler boring bar so we could bore the cylinders for the new .100 oversize pistons. After boring the cylinders we mounted the block in our AMC surface grinder and surfaced and squared the decks of both banks to ensure equal distances to the mainline. The last step of machine work to the block was mounting the block in our Sunnen CK10 cylinder hone. We installed torque plates to the decks with ARP head studs and then finish honed the cylinders to size for the new .100 oversize JE Pistons and Childs & Albert Z-Gap rings. The crankshaft was profiled, ground, and polished to size on our Winona Van Norman crank grinder. We then balanced the crankshaft / rotating assembly on our Balance Tech Balancer after re-sizing and prepping the connecting rods with our Sunnen rod hone. The cylinder heads got a complete 3 angle valve job on our Tobin Arp seat-and-guide machine and surfaced on our AMC surfacer to put the compression right where we wanted it. The engine was then completely mocked up and blueprinted before final assembly. This includes ball mic’ing the thickness of all the rod and main bearings and then torqueing them all in place. Once the bearings are all torqued into the mains and rods we setup the Sunned dial bore gauge so we can measure the ID of each one and compare it to the corresponding journal measurements of the crankshaft. This tells us exactly what the oil clearance is on each and every bearing. Once assembled we ran the engine on our run-in stand to heat cycle it a few times and to also make sure we didn’t have any oil or coolant leaks before installing it on the engine dyno to see what it could do. The 1941 Willy’s coupe isn’t a full on street rod but it isn’t a rat rod either. It’s a nice nostalgia style build which is why we had the blower and scoop magnesium coated to match the old original magnesium wheels. In addition to a hand full of high performance engine parts such as the JE forged pistons and Childs & Albert Z-Gap rings we built this engine with a complete Competition Cams roller valvetrain including full roller rockers. Motor Mission Machine & Radiator 5435 Desert Point Dr. Las Vegas, Nv. 89118 Phone: (702) 649-2366 or (702) 649-0648 Fax: (702) 649-4133 www.MotorMission.com
