When one subscribes to PHR they will also periodically (but not monthly) recieve 'Engine Masters' which is a gold mine of inside technical info, besides being great fun to read, if you are into the technical side of engines. Engine Masters is not available for subscription by itself. Its only via PHR subscription or on the rag racks.
www.enginemasters.com will take you to PHR dot com.
Dirrezas (4) @ 275/35-18, Eibach springs & bars, Bilstein Sports, Dinan Stage 2, slotted ATEs, Hi-Temp HTP pads, SS Lines, UUC-SS, White/Tan, Bling-free & Stealthy