I heard the reduced base circle cam was nessasary, not enough material around the tops of the lifter bores
with the 289 to support the lifters. I have no first hand experience with this though.
1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg
with the 289 to support the lifters. I have no first hand experience with this though.
1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg