[tog1937]

The 71 455 HO is basically a slightly lower compression and milder cammed 455 cubic inch RAIV (to meet emissions) and includes the 4-bolt mains. Just drop in some 10.5:1 forged pistons and a modern cam and have the best of both worlds. For even more fun top it off with a nice Holley HP mechanical secondary carb and an Edelbrock Performer RPM intake. Massive torque and unstoppable top end, a positively killer combination especially when mated to a Richmond Gear 5-Speed !