I have them on this Motor and so far I am happy with their fit, finish, look and performance. MOPAR Muscle ran a segment last month on Aluminum Heads and slammed the 440 Source heads as "copycat imported Heads" to the new Edlebrock E-Street units. They further went on to say, "the foreign-made heads can't compare in long-term quality to the Edlebrock castings". They then went on to say that the Metallurgy and machining were inferior on the foreign sourced heads verses the Edlebrock's which I find rather untrue. The 440 Source heads are bare cast blanks from off shore and the machining and set up is accomplished here at their facility. So far I am a true believer in their product but others probably feel differently...but for a really stock looking Motor, the 440 Source heads really do look good. Check their web site for more testimonials from happy users...:hello2: