[Ed Wright]

Billy, a friend of mine is a calibrator (tuner) and engineer, retired from GM. He told me about those Tuned Port Injection ("TPI") set ups used on the '85 thru '92 cars. It was designed for the 305" Trans Am series cars. Back then it was (supposed to be <BG>) bone-stock 5.0L "pony cars" like the Camaro, Firebird and Mustang. The factories had their own teams. Those long intake tubes with small cross sections were designed to get those 305"s off the corners of the road courses they ran on. It looked cool and made for very clean smog tests, so it went on the Corvettes and 350" Camaro/Firebirds. Those long runners really come alive at 2800 to 3200 on a 350", so much we pull 2 degrees spark right there, then start putting it back at 3600. Only intake I have ever seen do that.

My friend tuned GM's team cars. They even had to have stock injectors. He has some very interesting story's about those days. But, us old guys have our stories, don't we? LOL