Important Application Information:
Rollin Thunder Hydraulic Roller cams are for street high-performance and racing applications only - not for heavy vehicles. Use with Edelbrock Performer RPM heads (or other aftermarket heads), adjustable valvetrain components, screw-in studs, high performance adjustable rocker arms and at least 9.5:1 compression ratio. Headers, high-energy ignitions, lower-than-stock rear gearing and a high-performance torque converter (in auto. transmission equipped vehicles) are necessary.
Yes, you should replace the timing set. Yes, you should replace those tired old valve springs and stamped rocker arms or else you will probably find either or probably both breaking at some point in the near future. Yes, if you have a stock 289 it will sound "cooler" but without head work, headers, a decent intake and carb it will probably have little, no or less power than before.
6F09A 63A 8 26 26D 71 1 5