more money than they are worth, the port volume is far more than the 124cc stock 318 had, might just hurt the bottom end if you can't tune, and then they crack...
I for one cant argue with cheap chev price roller rockers,and a boost to 9:1! They make great street heads and the nice thing is they'll make 400h.p on your 318 with no porting.Magnums also produce a very flat and fat torque curve
All heads crack eventually. Id run em without fear myself. I still have my pair here and a 360 waiting for them. Some good porting on the magnums and I think 450 hp is not hard to achieve.
