CAN I RUN MY 4.8L TO 7000 RPM WITH STOCK JUNKYARD VALVE SPRINGS? HOW MUCH POWER IS AN INTAKE UPGRADE WORTH ON A 4.8L? HOW WELL DOES THE BTR NSR TRUCK NORRIS CAM WORK? HOW DO I MAKE HIGH RPM POWER WITH A MILD CAM? DOES THE HI RAM HURT LOW-SPEED TORQUE ON A 4.8L? CHECK OUT THIS VIDEO WHERE I RAN A CHEAP, LOW-BUCK, JUNKYARD 4.8L EQUIPPED WITH STOCK (HIGH-MILEAGE) VALVE SPRINGS TO 7000 RPM (TIME AFTER TIME). THE 7000-RPM 4.8L WAS EQUIIPED WITH A MILD BTR TRUCK NORRIS NSR CAM. THIS TEST INVOLVED COMPARING A LONG-RUNNER FACTORY TRUCK INTAKE TO THE SHORT(ER) RUNNER HOLLEY HI RAM? WHICH ONE WOULD YOU PICK?