HOW MUCH POWER IS A HEAD SWAP WORTH ON A 5.0L FORD? CAN I ADD 90 HP WITH THE RIGHT HEADS? HOW MUCH ARE EXPLORER GT40P HEADS WORTH ON A CAMMED 5.0L FORD? ARE AFTER MARKET ALUMINUM HEADS WORTH THE HIGHER PRICE? CAN I MAKE 400 HP WITH HEADS, CAM AND INTAKE ON A 5.0L FORD? CHECK OUT THIS VIDEO WHERE I COMPARED A SET OF STOCK E7TE IRON 5.0L FORD HEADS TO A SET OF GT40 P (EXPLORER) HEADS AND A SET OF AFR 165 HEADS. CHECK OUT THE GAINS OFFERED BY EACH (BONUS TEST ON ALUMINUM GT40 HEADS).