Factory Magnum Heads

BJR,thanks for the info. How much do you think the intake could be made to flow? And if I dont have a large overlap cam will this improve or eliminate the lean condition?

Im going to slap the mags on a 318 and will be building a very streetable,hi torque, good mileage motor for a 4000 lb car with 2:94 gears. I planned on a small cam under .450 like an xe262. The heads are fresh and have brand new stock springs, and stock 1.6 ratio magnum valve gear. I will port them with the template kit from mopar. Shooting for about 9.5:1 but may need to get K.B pistons so 10:1 with them.With that small of a cam I may not bother porting. Was thinking of that in case of a cam upgrade