Not sure how you run the 4L60-E without the computer as they will not even shift without the TCM because all internal pressures and shifts are solenoid controlled. The 700R-4 might work as it has the TV cable but then you still lose torque converter lock-up.
But your asking about EGR, EGR lowers combustion temperatures to lower NOX production. Running without it should not hurt anything but the air.
In the "old" days cams were iron and the cam gears were as well. Those were very good for wear as iron is a very good bearing surface. Then along came steel camshafts. A steel camshaft drive gear will destroy a common iron distributor gear. GM and Ford started using steel cams when they switched to roller lifters. They also started using heat treated (melonized) iron distributor gears.
Which driven gear you need is based on what the cam is made of and what type of cam it is. Generally a flat tappet style cam will be a cast iron core and gear so an iron gear is fine on the distributor. Roller tappet cams are pretty much ductile iron or steel core cams and those require either a hardened distributor drive or for short term (like drag racing) a bronze gear. The bronze gear will get eaten up very fast so is not something you want in a street vehicle.
A melonized gear however can be run with all of the cam materials without any real worries. When I build an engine for street use they are what I use. Never had an issue with them. Keep in mind that with a new cam you should install a new gear, and if you pull the distributor and discover that the driven gear is worn or damaged, you also need to change the cam as it will have that damage worn into it as well and any new gear you install will have a very short life.
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Tuesday, September 26th, 2017 AT 3:45 AM
