1971chevy pickup TPI

If you will be driving in cold weather, you need to run coolant thru the bottom of the throttle body from the intake to keep it from icing up.

With the Rock Valley tank positioned under the truck, the next step is to run new lines to the front of the truck. Most late 60’s and later vehicles have two fuel lines that can be used. You must have at least a 3/8 feed and a 5/16 return line to the tank. We chose to run Tube Tech’s nylon lines rated at 250 psi because this truck has set so long and most likely had rust in the old steel lines.

The new stainless steel fuel tank provided by Rock Valley comes with the in tank pump already installed. Before mounting the tank which will be between the frame rails where the spare was located, we installed wire pintail's for the sending unit, in tank pump and ground.

Using a transfer punch to mark the holes that need to be drilled into the frame for mounting the S&P stainless steel fuel filter mounting bracket.

The S&P fuel filter kit comes with two 16mm to AN6 O-ring fittings which allows Tube Tech’s nylon fuel line kit to connect to the filter.

Place the throttle body and insert the four 8 X 75 mm bolts through the front and tighten to 5 inch lbs. Again be sure to use anti-seize on all bolts.

Once the throttle body is in place you can then plug in the throttle position sensor and the idle speed motor which is the square four prong plug on the lower passenger side of the throttle body.

Mount the Lokar billet aluminum throttle cable bracket and throttle cable making sure to use anti-seize on all bolt and cable threads and check for clearance and interference.

Remove the 1/4 pipe plug in the side of the block which was used to drain the coolant and install the knock sensor (GM # 10456549) when doing a speed density system. All GM sensors come with a sealant on the threads. Be sure to route the knock sensor wire away from your spark plug wires, If the knock sensor wire is routed to close to the spark plug wires electrical interference could cause false readings from the knock sensor to the computer.

We installed a S&P 360-10 degree water neck using a 195 degree thermostat. With fuel injected engines the most efficient operating temperature is above 185.

Exit hose bib from idle speed motor hosing to heater input.

Breather tube to valve cover vent. (Not PCV Valve)

Cap off if using breather in valve cover.

Coolant bypass hose from intake to Idle speed motor housing

Tube Tech’s fuel line kit also comes with the clamps to secure the lines to the frame.

We used 14 and 16 mm to AN6 adapter fittings provided by S&P to connect the fuel lines to the fuel rails. 85-92 IROC/TA and 85-88 Vettes use a 14 and 16mm AN6 adapter. 89-91 Vette use 16mm feed & return.

We installed the stock ‘71 Chevy truck radiator hoses, S&P type III headers,(with O2 buns included) and power steering kit. We then mounted the alternator and air compressor using S&P brackets and pulleys.

S&P provided the custom power steering lines from the pump to the remote reservoir using a 16 mm to AN6 for the pressure side and you must use at least a #8 or a #10 on the suction side and the hose must be rated for 24 to 26 inches of vacuum.

Cobry tightens the line fittings to the S&P power steering reservoir that he has just mounted to the inside of the drivers front fender.

To finish out the engine we used S&P Spark Plug separator and a Lokar oil dip stick. Cobry put his O2 sensor on the drivers side collector which is the way the headers come from S&P, however you can install the O2 sensor on either side.

Cobry wanted to mount the computer inside the truck so he ran the wiring harness through the firewall and mounted the computer under the dash. He had a 90 Vette computer. Cobry used the 1227727 computer which is weather proof and can be placed under the hood, or there is the 1227730, 16198262, 1619644, or the 88899196 computers which are designed for use inside the vehicle. These computers can be found in V-8 and V-6 vehicles. To use a computer from a V-6 vehicle, you will have to replace the chip with a V-8 chip or a custom chip from S&P or another source.

The most important thing to do during this install is to make sure that you have good clean grounds. The ground wire from the harness connects to the back of engine, you must also have a ground cable from the battery to the engine, then a ground cable from the engine or transmission to the frame as shown above. Also a steel body vehicle must have a ground from the engine to the body.

Now with all of the components in place , we will set the TPS and the timing.

S&P Throttle Position Sensor Pigtail makes it much easier to check the voltage of your TPS using any digital volt meter. To use this pigtail you simply unplug the TPS and plug this pigtail between the male and female ends. You can then attach the clamps to the leads of your volt meter. If you do not have this jumper, you will need to prick the blue and black wire coming from the TPS with some sewing needles to hook your meter probes too.