Use stock Chevrolet crank pulley; for double groove use GM part# 37744043. We use early (5/8”cc) groove spacing on pulleys.

1. Straight up thermostat housings work the best for most installations.
   a) Murray # 277689 (54-72 GMC & Chevy light trucks)
   b) Super Sunny #S6002 straight up billet aluminum housing
2. Engine driven fans:
   a) Permacool 15” or 17” fan: this is polished, stainless steel.
   b) Blades may have to be trimmed slightly
   Note: most fans will require the use of a special fan spacer; they are available from us
3. The following hoses work well with this kit:
   a) Dayco 70-477 upper hose
   b) Dayco 70-457 lower hose
4. Water pump to Riser housing gasket: GM Part# 90190983
   *use ULTRA BLUE silicone if you do not have a gasket
5. Pump furnished with kit is German Opal, with 7mm mounting holes clearance drilled to 11/32 or “R” size
6. Rear fins on pump housing must be clearanced slightly when used with some manifolds that have their thermostat housing pushed forward. ie; 48 IDA Weber or dual four BBL manifolds
   IMPORTANT NOTES: some engines trap air in the top of the Riser pump housing when the radiator is initially filled with water. Bleed trapped air through 1/8” brass air bleed at the top of Riser housing…run engine for a minute and rebleed. We do not use a bypass hole on the Riser pump; bypass is used for fast car heater warm-up and to circulate water in the block when the thermostat is closed. You must provide a means for water to circulate in the engine with a closed thermostat.
7. Drill bypass holes in thermostat: (SEE Below)
   a) Drill one to three 1/16” holes in thermostat plate
   b) OR: knock out center valve and use the plate only
   c) If you do not have a car heater; run a hose from one of the front ½” holes on intake manifold to the heater hose nipple on the water pump inlet, however you must:Restrict the flow of water to the pump by placing a restrictor plug in the hose with a 3/16 or 1/4 inch hole.

1. USE A RECOVERY TANK AND PRESSURE CAP:
   a) Pressure cap should be as high as radiator tank will stand.
2. USE RUST INHIBITOR: EITHER OR BOTH:
   a) Antifreeze 25% solution.
   b) Soluble oil and water solution.
3. DRILL BYPASS HOLES IN THERMOSTAT:
   We Do Not Use a Bypass Hole on The Riser Pump; Bypass is Used
   In Passenger Car Heater Warm Up, and to Circulate Water In the
   Block When the Thermostat Is Closed; You Must Provide a Means
   For Water to Circulate In The Engine With a Closed Thermostat:
   (See Instruction Sheet Also)
   a) Drill three 1/16" holes in thermostat plate.
   b) OR: knock out center valve and use the plate only
   c) If You Have No Car Heater: Run a Hose From One of the Front 1/2"
   Holes On Intake Manifold To the Heater Hose Nipple On the Water Pump Inlet, However, you must:
   d) Restrict the flow of water to the pump by soldering a plug in
   the hose fitting or inserting a plug in the hose with a 3/16 or 1/4 inch hole.
4. USE ENGINE DRIVEN FAN ---> IF AT ALL POSSIBLE:
   a) Electric fan is a poor second choice in most cases.

THE FOLLOWING PERTAINS TO RISER WATER PUMP KITS ONLY:

1. BEFORE STARTING ENGINE: READ THIS: READ THIS: READ THIS:
2. BLEED AIR FROM 1/8" ALLEN PLUG AT TOP OF RISER HOUSING:
   a) Air will be trapped in RISER PUMP HOUSING during
   initial radiator fill up.
3. RUN ENGINE FOR A FEW MINUTES:
   a) Rebleed to expel any possible remaining air trapped
   in top of RISER PUMP HOUSING.
   b) Check that radiator tank is completely filled----
   use recovery tank and cap.

OK, SHORTIE PUMP OWNERS, I KNOW WHAT THE NEXT QUESTION IS: BUT NO PROBLEM, SHORTIE PUMPS WILL SELF BLEED IF HOLES ARE DRILLED IN THERMOSTAT PLATE: (SEE YOUR INSTRUCTION SHEET)