dual thermostat manifold

[tnt1197]

I am installing a Heath flow balance kit on my 97 K3500. Will have the OE dual stat manifold left over. Will there be any issues if I try to install it on my M1009 and run the 87gpm? pump until I can fund the upgraded pump?

[Robyn]

I cant think of any problems.
The issue seems to come when folks try to run the High output pump with the single stat setup.
Running the dual stat xover with the lower flow pump should cause no issues at all me thinks.

Best

Robyn

[DmaxMaverick]

The "Heath flow balance kit" is not what I, and others, consider an "upgrade". Have a look at THIS THREAD (http://www.thedieselpageforums.com/tdpforum/showthread.php?t=25230) for more info.

[john8662]

Mounting the Dual Stat on a 6.2 is not a straight forward installation.

I've got one on my '82 drag truck, and it took some adaptation to get it to fit.

You'll need to highly modify your injection pump throttle bracket

You'll need to adapt your coolant bypass hose, the dual unit uses a 1" hose, the 6.2 waterpump uses 1/2" or 5/8". You'll also need a pre-molded hose to make the turn, too sharp for regular hose.

Then finally, you'll need to adapt the heater hose side to clear everything (easier on a military truck here) civilian had the CDR in the way.

I don't think it's worth the trouble to adapt with the standard GPM waterpump.

J

[More Power]

According to GM, a single bypass-blocking 6.5L thermostat is capable of flowing 90-gpm. This works fine when combined with an 87-gpm water pump, but not so well for a 130-gpm water pump. For those who insist on using a single t-stat with a 130-gpm water pump, do not use a bypass-blocking t-stat.

I have a simple test in mind for this theory... Three thermocouples installed in one head (front, middle, rear), then tow at least a 7000-lb trailer up a 5-8 mile 4-6% grade at the speed limit - do it twice, with/without bypass. ;)

Jim