witch heads are going to be better for a 496 bbc 088 or 049 s both are iaron and have had some porting done the 088s are recktangle ports and the 049s are ovels
RECT heads folw more air fuel = HP
rec. ports are better for higher rpms... 049s are closed chamber and are good for lower and mid.. but more of a street engine... ive been trying to find some good original heads for my 402 bbc im building for my 79 camaro, and everybody is recommending the 049s
thanks it looks like i am going with the 049s the rect sold on me