The last four-cylinder pushrod engine sold in new vehicles here was a General Motors product, as it turns out: the GM 122, which was installed in the basest of base-model rear-wheel-drive ...

The need for this was emphasized recently by a project involving the testing of Ford 4.6L modular V-8 two-valve cylinder heads (this configuration will be compared with popular 5.0L pushrod ...

Most GM V-6 and V-8 pushrod engines will have cylinder deactivation, which GM calls Displacement on Demand. The system is a computerized engine management system that shuts down cylinders when a ...