Originally Posted by mafiacustomz
Ok so lets say i go to a carb and add the zz4 cam so the computer is out of the way. How bad will my mpg go down i would say it gets 20 mpg highway now what would it be after.
Realistically? It could end up in the single digits but probabaly low to mid teens. I have known SOOO many guys over the years that have done what you're wanting to do and turned decent running cars into total turds.
The ZZ4 cam doesn't even have that much of a lopey idle, even in a 305. I'm putting one in a 305 for my truck BUT I'm building the engine from the block up to make use of the ZZ4 cam with Vortec heads, flat top pistons, 9.8 to 1 compression, aftermarket intake, Tri-Y headers and my truck already has the torque converter and gears to make it work. I'm counting on NOT hearing much cam.