A while ago we scored a pulled-apart, but intact, 1969 Ironhead powerplant. The engine was in great shape, and it already had the top end done up with bigger pistons and a ton of machine work. The only issue was that one of the cylinders and heads had the top fins missing. It would be a shame to put together such a nice motor and have one of the largest fins missing, knowing it would stick out like a sore thumb. Luckily for Hot Bike, we’re friends with Dave Singrey of Davey’s Welding, who specializes in fin replacement on heads and jugs as well as Knuckle, Panhead, and other early-engine case repairs. After a brief phone discussion, we putted over to Dave’s shop, and he showed us how to properly replace a fin from tip to tail. Read on!