My first question is how do you tell if a cam is going to have a lumpy idle, I love the sound of camming at a redlight, is it the duration, lift, or lobe seperation? or any of the above? I always thought the higher the lift the lumpier the idle. And the other question is, I was thinking about stroking my 302 in my 95 stang to about 347, throw some gt40s on it upper and lower intake and all the other goodies, my question is how reliable is a stroker? Is it capable of 100,000 miles? I definatly won't race it everyday, but I want the power there if I need it. I guess I'm asking if it is reliable to stroke an engine? thanks for all the help

 

am in the same boat as you. im in the process of building a stroker but 331 instead of 347. from what i have read, the 347 has 1 major issue. the oil piston ring runs through where the con rod pin is located because of the depth of the piston itself. this in turn apparantly causes oil burn problems. it is because of this issue that i having spoken to various people that i decided on the 331. the oil ring sits above the pin because the piston is made slightly longer. the difference in B.H.P is minor, It's the reliability which is important to me so 331 it is.

i hope this is of help.
Phil

 

thanks that helped alot, 331 bound, now have to figure out about the camshaft thanks

 

Old news. New pistons for the 347 don't have this problem.

Duration and lobe separation will affect idle quality more than lift. A simpleton way to think about is that lift is torque and duration is horsepower. Since duration helps more in the upper rpm bands, it will deteriorate the idle quality. Lobe separation also plays a part. 114* is a lot smoother than 110*.