Harness is from Jim's performance.
The Blazer was rewired with a stock replacement harness but I have since modified those harneses as well.
The TPI wiring and the orig. Blazer wiring are independant of each other.Other than grounds and power they do not mix.
My gains were approx. an extra 50 miles to the tank.(that's hwy miles with a 700R4 locked up doing between 65+75mph)
Instant startup and smooth idle,better throttle response.
The downfall of a stock TPI is that it falls flat after 5000rpm.The size of the runners really limit it's potential for power.
But for me and what I use my truck for it works great for me.
Burt....your one crazy MoFo!
Thanks though!!!
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's
HERE