Advertised numbers on factory performance cams always seem quite large. With a 4 speed it would really work well and sound a bit more choppy. 274 duration and 450 lift, both similar to the old 327/350 but much more torque. Also, summit makes a k00172 cam an lifter kit for around 135 that may be better since its cut on a 106. Good luck finding advertised duration numbers. Elgin makes an old 327/350 cam and they run great in a combo like yours. It seemed to be a fairly popular choice until the Voodoo cams came along then that's all you heard Vortec head/Voodoo cam combo. They normally used GM crate engines with dished pistons then fitted them with thin head gaskets to get the compression up a little. They show HP numbers in the 350-370 range with Vortec heads and bolt on parts.
There are a few magazine builds using the updated cam with Vortec heads. Supposedly redesigned for more bottom end and to work with lower compression than the L79 had (advertised at 11:1 but experienced engine builders report it left the factory with much closer to 10.5:1). Said to be GM's updated version of the 350HP/327 cam. If you're stuck on factory cams there's also the GM 330HP/350 cam that's somewhat close to the Isky above. Here's a link to the Cam & Lifter Kit, as you'll need Lifters too Should work just fine with your existing valvesprings I've used it in a lot of applications like this with a lot of luck. This one isn't too wild, but it's going to maximize torque production over a very wide range. I'm going to recommend the Isky 201264/271-12 I highly recommend running something like Gibbs oil to keep those lifters alive.īased on what you're telling me, we definatley want a dual pattern cam with more duration on the exhaust side to compensate for the poor flowing exhaust port on wedge style GM heads. I totally understand you wanting to stay with the budget flat tappet cam, just know going in that you're playing with fire a bit with the current oil formulations. That's pretty low and limits cam size a bit. Ok - so with a 67cc chamber and a "targetmaster" piston (-12cc), you have compression that's around 8.6-1.