Now for the fun stuff. You do need to pass cars on the freeway, don't you? Freeway on-ramps are perfect places to run the car at WOT in Second. Obviously, do this in a safe manner; we're talking straight on-ramps with a buddy reading the O2 sensor. As the driver, you need to focus on the road and the traffic around you. A nice power sweep in Second will give you all the readings you need to fuel the car accurately.

Once you have worked out your jetting, we're sure there will be times that you may forget about the speed limits. This will give you an opportunity to get different readings and different rpm and load points. The bottom line: Be careful!

Need Some 5.3l Beans
Q: I have been reading your magazine for a few years and love all the new tech for classic Chevrolet metal! But my question is about something a little newer. I have a '99 extended-cab Silverado with the 5.3L Vortec and an auto trans in it. It has a complete K&N cold-air kit, an after-cat dual exhaust, and a set of Kuhmo Road Ventures (285/75R16). I drive my pickup every day, and while the performance is decent for a 2.5-ton vehicle, I'm not satisfied. I've thought about possibly adding a blower or turbo, but I can't seem to find a lot of resources on how much power I can safely make without rebuilding the motor. The truck will see some track time, mostly just for fun once or twice a year. I need it to be completely reliable, as it is used to tow and haul on occasion. Thanks for any advice you have and keep up the good work!
Trevor Heinen
Hillsboro, ND

A: I spent quite a bit of time with an '00 standard-cab shortbed truck that was owned by a good friend of mine. This truck was used on many Hot Rod Power Tours with a K&N intake, cat-back exhaust, tire and wheels, and suspension. He got bored with the power so we installed a MagnaCharger supercharger kit and beat it within inches of its life!

The MagnaCharger kit uses an OE-based Eaton supercharger and an integral air-to-water intercooler. These packages are original equipment quality and durability. Can you find a higher output system? Probably. However, we don't think you can beat their durability. Check out the Radix Intercooled Supercharger system PN 1-12-60-001. This kit features a 60ci Roots-type supercharger with integral bypass valve, and a fully assembled inlet manifold with injectors, fuel rails, and intercooler. It also comes with a handheld flash programmer to install the supercharger tune right into your PCM that reflashes the factory ECU, including the spark and fuel calibration, transmission shift points, line pressure, and torque converter strategies are optimized to manage increased torque, horsepower, and mileage. This system will add 120 hp and 120 lb-ft of torque to your base 5.3L. This will wake up the performance of your truck and give you the towing capacity you're looking for. The best thing is that it won't leave you stranded on the side of the road.

So like we said, you can buy more power, but will it get you home. Look at other options, but we think you will be happy with the MagnaCharger.
Source: magnacharger.com

Angle?
Q: What is the reference plane for measuring valve angle? I assume (I know that's dangerous), it's the horizontal axis. Is 7 degrees flatter than 23 degrees? I can't remember seeing you define this either in print or via an illustration. Looking at a picture of an assembled engine, however, doesn't back my assumption up. If you measure from the vertical axis, wouldn't 7 be steeper than 23? Is this measurement made with the head not mounted but on a surface table?
Bill Bodell
Farr West, UT