Hi folks I have a 1939 45 servicar with standard iron heads and the "studs in the cylinders" instead of head bolts. I just picked up a pair of OEM 1939 aluminum heads and realize that I must remove the engine from the frame to install them. I was wondering if strokin the engine is worth the expense and how difficult it may be. I have a linkert M-52 and the 22T engine sproket. The trike runs great, starts right up and has aprox. 3k miles since my complete rebuild and restoration almost 14 years ago. Top speed is about 55 mph and is very gutless off the line. Other than flywheels and pistons what else is required to stroke this engine, and would it be worth it to replace the cylinders with the later "head bolt" type?