Hi,
If you look in my picture album you will see what a little TLC care can do for the V-6 engines. What I appr. most is having something rare and different as well as a piece of tru automotive history. I wont really drive the truck mor ethan a few thousand miles a year if that much, so the MPG/HP does not bothers me. The best modifications you can make are changing the rearend gears to highway speed set up I have a DANA 44 and changed from 3.92 stock down to 3.23.
Addeded a dual intake and a 500CFM holley 2 barrel carb. I get about 18 MPH now whic is ok in my book.
The engine is the most over engineered piece of equipment Detroit ever designed and shows that we can thinkout side of the box.
A few first with this engine (Taken from Jolly's page).
It's short stroke reduces internal friction . . . gives full power with less piston travel.
Result is less engine wear . . . longer engine life.
Peak torque is reached at low r.p.m. and maintained over a wide range of engine speed
for longer sustained power. The toughest jobs are handled in stride.
Oil and fuel consumption is low . . . maintenance and service cost are low . . .
save you money four ways.
It has the highest cooling and lubricating ability of any comparable size engine. This
means greater engine efficiency . . . longer trouble-free service.
Many major parts are interchangeable within all GMC V-6 engines to provide greater
parts availability and standardization.
High mounted camshaft . . . short push rods . . . big, tough, long-lived valves combine to
make an exceptionally rigid, durable valve train. Again . . .
lower cast, longer life, more economy.
Strength where strength counts ! Short, rigid crankshaft . . . massive connecting rods . . .
big, rugged, heavy-duty pistons. Many thousands of miles of dependable service.
THE HIGH OUTPUT OIL PUMP:
capable of pumping 14 gallons of oil per minute, provides extra circulation at all engine speeds extra protection and well oiled surfaces on all vital moving parts. Engine is lubricated as soon as it's started. Cam lobes dip into a built-in reservoir of oil as the camshaft rotates, preventing cam and valve scuffing - a major reason why this engine gives long, dependable service.
135 GALLONS OF WATER:
(at 3400 r.p.m.) Are pumped through this engine every minute. With thermostat open, only half the water goes to the radiator, the other half returns to the pump through a by-pass. This results in excellent cooling ability. There is less than four degrees variation in water temperature throughout the engine. This checks the possibility of hot spots. Here's cooling efficiency that is not matched by any other comparable size engine. Life of pistons, valves, valve guides and spark plugs in much greater, and the possibility of head-cracking is held safely in check . . . further proof of the durability and long life that is built into this engine.
POSITIVE CRANKCASE VENTILATION:
is provided by using manifold vacuum to draw fresh air through the engine. Air enters through a replaceable paper-element breather, travels up through the crankcase to the cylinder head covers, then through air flow regulating valves directly into an intake port of each head, carrying with it, into the combustion chamber, harmful sludge-forming fumes and moisture laden air. Bearings and other precision parts last longer . . . maintenance is less . . . engine life is extended.
