The latest excitement on the Two-Valve front is the Bullitt intake. Of course, as standard
Horse Sense: With the 50-lb/hr injectors Jimmy Vaccaro is running now being maxed out, Jimmy LaRocca wants to try a set 160-lb/hr injectors teamed with an EPEC computer system. With a step up in blower size in the near future and these additions, Jimmy V will be pondering his next round of modifications as he sails down the quarter-mile in nine seconds with his buddy in the Grand National.
We all know the Two-Valve GTs have needed horsepower help since they've been in existence. No secret there-and no need for us to harp on it any longer. The Two-Valve received a healthy boost in 1999 with an injection of 45 hp, but with the Z28 and SS Camaro running more than 300 hp, this still left the GT in catch-up mode.
To weigh the odds more in their favor, many Two-Valvers have strapped on superchargers, while '96-'98 owners have added the '99-up heads and intake (or complete '99-up engines) for increased horsepower. Nitrous hasn't really caught on with the modulars as it did with the pushrod crowd, but that will change with more kits becoming available. In either situation, building horsepower with a Two-Valve modular motor is going to be limited by the plastic intake.
Enter the Bullitt Mustang and its new aluminum intake. Though the rumor mill gave the Bullitt up to 275 hp from a Two-Valve mill, the final tally left 265 hp on the table-just 5 more horsepower than a GT. This horsepower level was definitely a disappointment, but the Bullitt intake has jumpstarted a trend of Two-Valve intake swaps to take advantage of its durable design.
Even with the stock intake in place, Jimmy V's car still made 538 hp and 510 lb-ft of torq
One of the first contestants on the Bullitt intake game show is Jimmy Vaccaro and his '99 35th Anniversary GT automatic. If anyone's car was to scream for a Bullitt injection, it would be Jimmy's GT. With an ATI/ProCharger D1 supercharger, a built short-block, and an equally stout set of heads, Jimmy's car was capable of 500 hp on Jimmy LaRocca's Dynojet. It was also capable of sending the original 4R70W automatic packin' for the junk heap with a Lentech Strip Terminator going in its place.
The first time out with the plastic intake reaped 10.70s on a mild tune. After switching to the Bullitt intake, those numbers dropped to a 10.32 at 129 mph with Jimmy LaRocca behind the wheel and shifting at 6,800 rpm. With Jimmy V behind the wheel, the car ran a 10.41 at 130 mph shifting at 6,200 rpm. "Jimmy shifts it higher because it ain't his car," Jimmy V joked. With no other changes at a Superstallions of the Net race at Cecil County Dragway in Maryland, Jimmy V ran consecutive 10.87s. However, he accidentally shifted from First to Third on one pass, and the belt tensioner let go at about 1,000 feet, sending the belt in about 10 different directions.
For now, Jimmy is happy with the car. He can drive it anywhere, throw the slicks on it, run 10s, and drive it home. His neighbor with the Grand National respects him now. The gentleman with the Grand National also drives his car to Englishtown, rips off 10.40s, and drives the car home. One of Jimmy's goals is to beat him. He says the guy's a little better driver so he'll have to line up a best out of three with the car in its current state, but for 2002 Jimmy says the guy is "toast." The goal is nines on slicks, driving to and from the track. If we know Jimmy V, it's as good as done.