For the headers, go with 151/48-inch. This is the most common size and the loss in torque would be marginal-and if there is any, you'd make up for it in the top end. On a totally stock engine with no other exhaust upgrades, the 111/42-inch headers would probably be OK. But you want to install headers only once, so run the 151/48-inch ones in case you decide to do more with the car in the future. The 151/48-inch headers and a true dual 211/44-inch exhaust system with a good H-pipe will make your car run quite nicely. Expect about another 15-18 hp at the rear wheels.
Wheel Upgrade HelpI'd like to correct a bit of information that was provided in a recent Late-Model Corral. In your response, you indicated there should be no problem with the tires rubbing on the car's inner fenderwells. In fact, the tires will most definitely rub at full steering lock. This is because the '83 V-6 Ghia was not equipped with the steering-rack limit bushings that were originally used on cars that came from the factory with the 225/60VR15 tires. Ford Motorsport (now Ford Racing) used to sell a kit with these bushings under PN M-3500-A, but they're probably a tough find today. A better option is to upgrade to the '85-'93 Mustang 5.0 (GT or LX) 15:1-ratio steering rack, which will already have the limit bushings and much better steering feel than the old 20:1 rack. The power-steering pump from the same donor car should also be used for best results, but it's not mandatory.Jeff CookVia the Internet
Although the issue becomes a problem only at full steering lock, it's still something to think about. And the faster-ratio, late-model steering rack would certainly give the car a nicer overall feel when driving. Thanks for the heads-up.
Rebuild vs. CrateI have a '90 Mustang 5.0 and it needs a new engine. How do you feel about getting the existing engine rebuilt versus going with a Ford Racing Performance Parts' crate engine? After looking through the FRPP catalog, it seems like some of the crate engine options are a pretty good value. What do you think?David CrileyVia the Internet
I agree with you. Ford Racing's many crate engine choices are tough to beat from a value standpoint. While you could have your engine rebuilt, there's always the question of how long it will take for the machine shop to do the work and, at a minimum, your engine is going to need all new pieces anyway. In a typical rebuild, the only things in the short-block that are usually reused are the block, crank, and connecting rods. By the time you go through all the hassle of piecing together the rebuild, you could have the crate engine in your car. And the options with an FRPP engine, like GT-40 aluminum heads and a bigger cam, make it a better value. Or you can get a stock replacement mill from FRPP, as well. My final answer? Go with a crate engine.
Send your '79-'05 Mustang questions to: Late-Model Corral, 9036 Brittany Way, Tampa, FL 33619, or e-mail to mustang.monthly@primedia.com with "Late-Model Corral" in the subject line. Include your name, city, and state in all letters and e-mails.