Goat,
An AFC spring kit is mainly to allow for smoke adjustment at low boost pressure while not killing low end accelleration after you have installed an agressive torque plate, moved the AFC housing all the way forward and added larger injectors. Sometimes it needed with just a strong torque plate. All the AFC spring kits come with good directions & pictures. Its not worth explaining here. A very simple install.
It allows more fine tuning of low end torque and minimal smoke than the OEM spring. I doubt putting it on a stock truck would give you any more power & torque. It might, on the low end with the light spring, but not worth the time & effort.
The Governer spring kit allows your engine to rev higher. Up to 3800? RPM's with an exhaust valve spring change. About 3200? RPM's without new valve springs without cutting back fueling like the OE Governer springs do @ 2200 RPM's or so. Off idle to redline the engine feels stronger & smoother. This is another modification most guys do when the truck has an aftermarket cam plate & injectors.
I personally don't know of anyone who has an AFC/Governer spring kit(s) on a stock fueled engine. On a BOMBED truck, it's a must have.
The AFC spring kit is simple to install.
The Governer Spring kit is a little tougher, but not bad.
An aftermarket performance torque plate is a good & inexpensive way to start building torque & HP for your truck. You will be amazed at the power incease.
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[This message has been edited by HEMI®Dart (edited 03-13-2001). ]