Any cam grind that has over 220 degrees duration will give that kind of idle. However, most with that kind of duration also have a lot more lift than a stock cam. That will give you very low engine vacuum that will change how your automatic transmission shifts (not good) and can break valve springs, pull rocker studs out of the heads and cause valve/piston clearance problems. (read: bent valves, holes in piston tops)
Overall it isn't anything you want to do to your engine, especially just for the rumpy idle which though it sounds "cool" is actually a byproduct that just happens with those cams by design, but has no benefit.
Engines you hear that kind of idle also have extensive modifications to the carburetor, intake, exhaust, pistons and lower end (crankshaft) and if automatic, they have different torque converters and trans valve body mods as well.
If you want to go fast, get a good aftermarket intake and carb, a mild cam that works in mid-range rpm's, put a set of headers on it and a better exhaust system. Don't ever buy a used camshaft and always replace the lifters with the cam (once they are used, each lifter always needs to be on the same cam lobe forever. Used ones most often have not been kept in order and will quickly round off any different lobe they are used on)
Do a lot of reading and studying before buying anything or you will spend a lot of $ and wind up with junk or less than you had before. Everything needs to work together.It's not about just putting in parts. There is a ton of science and math there that can't be ignored.
good luck!!
89 views
Usually answered in minutes!
×