General Motors has patented a variable compression engine with pushrods that could eventually find its way into a V8 application, in addition to twin-cam designs. This patent could also be the first piece of solid evidence that GM is working on a next-generation Small Block V8 engine family, which could still be a few years out. We could see this technology debut in the next-generation Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, due out in 2025 or so. GM Variable Compression Pushrod Engine Patent DetailsDiscovered by MC&T within the U.S Patent and Trademark Office database, GM’s desig…