This is our smaller choice from Comp Cams, which we recommend for most non stroker engines that want lots of low end response and drivability on the street. At just 230/236 on the duration at .050", this is great for lots of vacuum for power breaks. We'd still recommend running aluminum heads with a decent (2000-2500) stall converter, and 3.23-4.10 gears. These are ground on a 110 degree lobe separation angle. And, since this is Comp we're talking about, you can be assured of two things: The product is 100% made in the USA, and the quality is second to none.