Originally Posted by Speartech

Our harnesses are custom made for your application as opposed to the "one size fits all" approach. You tell us where you want to mount your computer; we don't tell you.

Our harnesses come with a nice split loom covering for a nicer look, instead of wire ties and no covering.

We build harnesses for all years of the LS1 (97-04) and its variants (4.8, 5.3, 6.0, 8.1). Our harnesses don’t require the limited use 98 PCM (unless the customer already has or wants this PCM).

These engines have changed over the years and our harnesses have changed with the engines. In 2001 the high flow 85mm 5-pin mass airflow sensor came out and many customers are using this MAF sensor. With our custom harness, we build to suit the features and options of your setup.

We pioneered the use of the electronic throttle on retrofit LS1/LS6 applications and are now building approximately 50% of our harnesses with this feature. The street rodders love it, and most of the others don't address this or any of the other changes that have taken place on this engine series.

Our method of custom building costs more than the mass production "cookie cutter" way of doing it, but the fit and finish of the final product is worth it to many, many customers.

We also believe that the best results come from setting up the total engine control package. This is why we not only build the harness, but also program the PCM specifically for your vehicle. We don’t use any VATS modules, tricker resistors, O2 sims, etc., with our harnesses. You tell us about your setup (gear ratio, tire size, emissions equipment, etc.) and we’ll program the PCM specifically for that setup. The results of this total approach method means that your new powertrain will operate as designed in your vehicle without any extra gadgets or modules; and without the check engine light being on all of the time.

Another advantage of the custom build approach is with the combinations you guys are putting together these days! We’ve built harnesses for about any mix and match setup you can imagine. How about an LS1 engine with 4L80E transmission, 75mm MAF sensor, electronic throttle, 7 feet long! What’s the painless part number for that one?

We are higher than some, lower than others, but the quality is surpassed by no one!

Originally Posted by 55LS1

John, the harness is the last piece I need to complete my conversion. I am convinced you are the best person for this job. My LS1 has no accessories, only a Meziere race electric water pump, and the alternator mounted low on the drivers side. Can you make a custom harness for this setup? Thanks

Originally Posted by Speartech

Sure can!

We did a harness for someone else that was using a Meziere pump, and we brought the power wire for the pump right out of the harness for him. As long as you tell us which alternator your using and where it's at, we'll make it that way. Also, if you measure from the back of the engine to wherever you want to mount the PCM, that's how long we'll make it.

John

Originally Posted by 55LS1

Sounds great! So your kit is completely wrapped and covered when you ship it? Do you have any pics? I need something really clean for my 55 chevy/LS1 swap. Thanks.