[427supr]

I've been pricing Eagle kits for a 408 and a 418 from Summit. The less expensive 408 with a cast steel crank is about 1/2 price of the forged crank 418 kit. I am aware the forged is a better option, but for street use the cast steel is fine. Other than the stroke of 4.00 of the 408 and 4.10 of the 418, using the same engine components, would there be a big difference in HP & torque between the 408 & the 418 engines? I was told using a stock block, not to go over the 4.00 stroke, but some builders I've talked to advised the 4.10 stroke is fine with the stock block, but is pushing it with a 4.170 stroke.