This is the one that has a stock cast iron housing modified on the inside for high flow. Did you see lower temps than with a stock pump, all else the same? I ordered one after exhausting all possibilities except the pump for my 396 which has a tendency to run quite warm, even on the highway. Block and heads are whistle clean on the inside, new GM 7 blade fan, new Eaton fan clutch, stock shroud, and new 4 row radiator. Tried 3 different 160 deg Tstats, water wetter, straight water, 2 different temp gauges. The only thing left to replace is the Carquest rebuilt water pump (it didn't help either).

Von, you saw the Trans Am I have. it was overheating with everything I tried. bought a Stewart stage 1 pump and replaced the generic pump and cheap electric fan with a fan from a Ford Windstar. it now runs at 140*. not sure which helped the most but the pump really moves the coolant now!

I have one on my BBC...Even on hot days it doesnt go over 200.I would buy one again.

Von,i would definately go with the S/W or Milodon higher flow pump,they are worth the money and also go with a higher flow Robert Shaw 180 deg f stat too while your at it to take atvantage of the higher flow pump.

Also,are you running an electric or mech temp gauge and is the sending unit for the temp gauge in the head or intake.

I have found the stock older electrics to be fairly inaccurate at times.

I have a stock 69/396 with a mild cam & stock ex maniflods with a mech gauge and temp sender in the head.

I have all the following new, Milodon hiflow pump & 180 stat,std fan clutch(not the HD unit which will run cooler in traffic but pulls in too much dirt/dust into the engine compart),7 blade GM clutch fan,stock shroud,4 core radiator,autometer mech tep gauge.

After it fully warms up on an 80 deg day it will run @ approx 190-195 deg f at 55-60mph and will go up to 200 deg f in 3-5 mins of stop/go traffic,and to 210+ deg f in 5-8 mins of stop/go traffic.

Now i felt that having the temp sensor in the head would infuence the temp reading at the gauge to i tested that theory and here is what i did and what the result was.

I got a hold of 2 thermometers for AC work that went up to approx 220 deg f to see if they read the same to ensure i was getting the right temp readings as kind of a sanity/calibration check.

I next drove the car for approx 20 mins in 80 deg weather and then came back home and stopped the car in the driveway at idle.

I next very carefully removed the rad cap as to not burn myself with hot coolent.

I then let both thermometers dangle in the hot coolent through radiator cap opening
for a minute or so to stabalize.

Both of the termometers read apporx 185 deg f at the time but the new high quality Autometer mech gauge with the sender in the head by the ex manifold/ex valve read 198 deg f at the same time reading approx 13 deg higher than the actual coolent temp at the radiator opening.

So keep this 13 deg f temp variation that i found in mind if your runing the temp sender in the head by the ex manifold/ex valve. This is becasue it will read higher there likely due to the higher ex manifold temps/ex valve in close proximity to the temp sender.

I have seen where some people say it's a more realistic temp from the sensor by the head and others would say it's more realistic from a sensor in the intake manifold or checking it like i did
through the radiator neck,but who know's which is the best place for the temp sensor?

I am not really sure which is the correct way to look at this,does anybody else know the real story on this,should the temp sensor go in the head or intake?

Scott

I bought one for the BBC. I havn't installed the motor yet but it is sitting there mounted on the engine.

Daniel

Steve, I remembered you put a Stewart pump on it, but I thought you said a Stage 2. Sounds like the Stage 1 definately helped. Scott, My temp gauge is mech with sensor in the head. I do have a Robertshaw T-stat (160). I would think a temp sensor in the intake would read higher since the coolant picks up temp as it travels toward the radiator and I'm thinking the closer to the thermostat housing it is, the hotter. My engine is restored to appear stock (except headers) so an aftermarket pump housing isn't an option. What's strange is my temp on 80-90 deg days runs about 210-215 at a 60 mph cruise. I can tell where the Tstat opens because if the outdoor ambient temp is about 70 or below, the coolant temp stays there.

Von, I love my stage one pump on my 350 crate, GM housing and stock appearing for sure. Like you I changed everything twice almost it seems and she still ran warm. Now it runs a cool 180 running 65-70. I am currently building a 66 396 and it will have a stage one on the front of it I can assure you. Go to their web site to the Q/A sections and e-mail old Jack Wilson describing you situation. There is a ton of heat related info to review also. Good luck.

Jesse Robertson

Thanks Jesse. I have one on order so we'll see how it does. Should be here tomorrow. I'm in the middle of a cam swap so now's the time to change. With the weather getting cool it might be next spring before it gets a true test. I figure it can't hurt.

Sounds like everyone is happy with the Stewart Stage 1, makes me happy graemlins/hurray.gif I just picked one up for my baby

Jerry