GM 7.4L TBI to Vortec Conversion
Has anybody attempted a TBI to Vortec conversion? When I bought my MH in 2004 I was told to buy a '96 or newer to get the Vortec but wasn't told to make sure the chassis was also the same year. I woun...
Forum Discussion
sum1 wrote:
If you enjoy such projects and have the time, go for it, I don't have time. I put a Harris Performance chip TBIchips in mine after discovering a timing curve glitch in the stock chip. The chip made an undeniable difference in performance, economy, temperatures. I run hi-test, as well. I now pull 6 and 7% grades at 21,000 pounds. Brian runs a one man show and was very responsive. He can burn custom chips to suit your needs, as well.
In working with Brian I was impressed. He knows 454 TBI from personal ownership over the years as well. He was the one that called our miss and back firing cause correctly. He said he expected the Pick Up coil under the distributor and was correct. It was a $15 part at O'Reilly's but it was a heck of a job at the time because the twins were only nine but they helped make it happen because the they had asked for a MH. :) Those were fun years for sure. If it had not been for Brian's knowledge and help we would have been stuck for a while.
What some of us are trying to communicate there is NOTHING wrong with the 454 TBI design and was a quantum leap forward over the carb which is still a good system. The 1992 TBI system has needed nothing in our case and is still performing like new. Love the no choking part. :)
