Can't really go bigger than than 72mm stroke in stock cases. Anything bigger than that you should use a big wheel crank. Is doing a 72mm stroke in stock cases a good idea? Not for the average guy imo alot of flex unless you cast plugs and weld them in but you mess up one set and have to do another (with the cost) you miswell buy billet..jmo can you do a 78mm stroke in stock cases, yes, is it practical.. no again jmo