You don't need those heads. They're no better than the gm castings on your engine right now. They have smaller "non-vortec" intake ports, larger combustion chambers, and aren't really intended for the type of buildup you're trying to put together. They do not have the vortec raised runner, they just share the vortec bolt pattern. Vortecs are good for 450 horses in stock form, which is more power than your fuel system can support.
Too much cam and not enough gear will make jack a dull boy. If you have 3.73 gears or taller and anything bigger than 31" of tire, you need to be thinking about a looser torque converter with that cam. It has almost 20 degrees more intake duration than the stock cam. That means the powerband shifts up in rpm. A lot. This leaves you sluggish at low rpm. Not a good situation when you're spending money to make useable power.
That is a hotrod cam, and does well in a light vehicle with a stick shift transmission where you can control the launch rpm variably, like in an f body or a corvette.
You're not going to use the upper rpm capabilities of that cam under the stock intake and fuel system. It will rev to 7000 rpm with the right springs and intake and a set of vortec heads. I like smaller cams. I suggest looking at the zz4 cam, which is 208/221 duration at 0.050". This makes more sense to me.
Too much cam and not enough gear will make jack a dull boy. If you have 3.73 gears or taller and anything bigger than 31" of tire, you need to be thinking about a looser torque converter with that cam. It has almost 20 degrees more intake duration than the stock cam. That means the powerband shifts up in rpm. A lot. This leaves you sluggish at low rpm. Not a good situation when you're spending money to make useable power.
That is a hotrod cam, and does well in a light vehicle with a stick shift transmission where you can control the launch rpm variably, like in an f body or a corvette.
You're not going to use the upper rpm capabilities of that cam under the stock intake and fuel system. It will rev to 7000 rpm with the right springs and intake and a set of vortec heads. I like smaller cams. I suggest looking at the zz4 cam, which is 208/221 duration at 0.050". This makes more sense to me.
