aluminum heads bbc
 

im thinking of buying aluminum heads for my 454 LS6. mark 4 motor. i want to use the gm heads #12363400 rectangle port open chamber. what head gaskets do you guys use. is there any horsepower increase. than iron rectangle port heads. id like the weight savings of aluminum..any pros or cons to these..thanks tom

Re: aluminum heads bbc
 

NHRA head is 12363408 the last 3 casting # 401 on the head

Re: aluminum heads bbc
 

castle 5, I have a set of "401" castings by C.F.E complete and ready to bolt on. These heads are super stock legal. Call me 248-342-3117 Luke