FAQ about oldholdens

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Here are some of the most commonly asked questions on oldholden.com, if answers are not listed below please click on the internal link(in blue) and that will answer your question.

How can I open my own oldholden shed?:

I am looking at buying a HQ-WB Ute, how do I tell if it is original, and what year it was made??:


What sort of Gearbox have I got? M20? M21? M22?:

How do tell what differential ratio I have?:

Same way suits any car. You need to jack up the rear end, and turn a wheel one complete revolution, while counting how many turns the rear drive shaft makes.

How do i calculate what differential ratio would suit my car?:

What is a stage 2 shift kit?:

A Stage 2 shift kit is a modified plate that goes between the valve body and the body of the trans. In some trans, holes have to be drilled and different checkvalves and checkvalve springs have to be used. This makes the shift harsh-no lagging/flaring between gears-a positive gear change feeling.
Stage 2 trans is different again-heavier clutches/springs/servo etc.
A shift kit can be put in with the trans still in the car-not recommended though.

What sort of Holley do i have? "the number on it says 0-1848":

What size carburettor should I fit to my motor?:

Does more Air = More fuel???:

What advantages can I expect from feeding more air to my air filter (via a scoop, cold air induction etc)?
If more air is fed to an engine does the engine compensate for this by drawing more fuel to keep the air/fuel mixture right? Should I expect to see a rise in fuel consumption??

It all depends on whether you want more air or cold clean air. If you put in more air you also need more fuel to keep the fuel air ratio correct for combustion. If either is out you will not get combustion. If you were in a vacuum like space (no oxygen) and stuck a match in a drum of petrol it would go out and not explode due to the incorrect fuel air ratio and petrol liquid doesn't burn the vapour does. You would also notice the match did not light as there is no oxygen, and hopefully soon after that you would also notice that you are dead, because humans cannot survive in a vacuum. ;)

Combustion cannot occur in an volume of 100% petroleum vapour, just as combustion cannot occur in an volume of 100% oxygen, the ratio of air/fuel must be correct for combustion to occur at all, and even more fine tuned for maximum power and efficiency.
Therefore, more air does not = more fuel, 'more air' alone = lean mixture.

Now Holden motors love cold air. I think just a cold winters night gives 5 - 10% gain in power. So if you can get your air from somewhere other than the engine bay it will perform better. The air coming to the carby under the bonnet has first gone through the radiator to cool down the water so the heat exchange has to be quite good; therefore the air hitting the carby is quite hot and not good for horse power. Heat also rises from the exhaust manifold up to the carby.

Can i bore my 253 out and make it a 308?:

No! you cannot bore a 253 to 308, there is not
enough metal in the bore of the 253 to bore it out to
308. They do share the same stroke but the cranks cannot
be interchanged as they have different size
counterweights, also a neoprene rear main seal type crank/block is not interchangeable with a wick rear main seal type crank/block.

Can I put a blue motor head on a red motor block?:

Yes! you can put a blue motor head on a red
block with some minor modifications to the block to
line up the revised water passages in the blue head.
This is done by laying the blue motor head gasket on
the red block and using the gasket as a guide, center
punch the water gallery holes, and using a suitable
drill bit (covered in grease to catch the swarf) drill
the new passageways to suit.......

I have a stock standard 6 cylinder motor, how can I make it go better?:

Tricky Bits

What’s the difference between a red, blue and black motor?:

 The Red motor has a nine port head, six exhaust
ports and three shared inlet ports.

The Blue motor has basically the same bottom end as
the red but the head has twelve ports, six exhaust and
six inlets which allows for better flow
characteristics, leading to better cylinder filling
(more power). The blue motor also has electronic
ignition which delivers a better fatter spark than the
points system used on the Red motor. The Blue Motor has a fully balanced crankshaft, which makes it able to rev higher than the red motor. The Blue Motor came equipped with a 2 barrel "varajet" carburettor, with vacuum secondaries. These are renowned as a poor carburettor with lousy fuel economy. The Blue Motor had several emission control features which the red did not, including exhaust gas recirculation (part of the exhaust gases were sucked back into the carburettor when inlet manifold vacuum was high. this was intended to re burn some of the unburnt fuel and products of incomplete combustion such as carbon monoxide.) Other pollution control features on the blue motor include more restricted centrifugal distributor advance than the red motor, and restricted vacuum advance (6 degrees compared with the red motor's 9 degrees.) The Blue Motor had a slightly longer duration and lift camshaft than the red motor, to compensate for the power - sucking anti - pollution modifications. A stock blue motor produced about 115 bhp compared with 105 bhp for a stock red motor. Of course blue motor parts on a red motor (without anti pollution equipment) can increase the power output of the red motor.

The Black motor is essentially the same as a Blue
motor i.e. same bottom end as red/blue, fully balanced crank, a twelve port
head the same as the blue but with higher profile
inlet ports for better flow.
The Black motors came with a varajet carby or Fuel injection.
Fuel injection giving the best power results, but the carburettor being slightly more fuel efficient (according to manufacturer's figures at time of release).
The Black motor also had a new ignition with "electronic spark timing" or EST that is
triggered by a sensor to sense the position of the
flywheel, which was terrific when new but can give
problems as the motor ages and is in my opinion best
removed and replaced with the Blue motor electronic
ignition. The EST does not have adjustable static advance. The carburettor Black motor had a slightly longer duration and higher lift camshaft than the blue or red motors, and the EFI black motor had a longer duration and higher lift camshaft again, similar in fact to the GTR XU1 camshaft fitted to performance 186 engines some 10 or more years previously.
The Black motor produced a claimed (approx) 120 bhp for the carby model and 135 bhp for the EFI model.

How do I tell what motor I have?:

The EGR valve does not reduce monoxide emmisions (CO) by recirculating unburnt fuel, it's purpose is to lower combustion temperatures by recirculating burnt gasses to reduce NOx emissions (Oxides of Nitrogen)

HX and HZ Red motors had EGR valves.

How do I tell the difference between a 253 and a 308?:

How do I change the lifters on a 253/308?:

1. Take off the inlet manifold making sure you have drained the coolant.

2. Take off the rocker covers.

3. Turn crank by hand until a cylinder is on the compression stroke and the pressure is off the rocker arms and take the pair of rockers off the head, lift out the push rods keeping each rocker and push rod in order to go back where it belongs. Do this for each cylinder.

4. Now you should have no inlet manifold and nothing stopping the lifter from coming out. That is if the lifter hasn't worn a lip on the bore, if it has it may be a little more difficult to remove, though it just needs to be lined up correctly.

5. When installing the new lifters use engine build lube or Vaseline both work well to lube up till the oil gets there.

6. I take it you can put it back together from here.

The inlet manifold and it can be a bugger to seal. The rear seal in front of the dizzy can move and slide out the back and you end up with an oil leak that runs down the back and imitates a leaky rear main seal.

I usually silicon them in as they have a type of glue on them that works ok for a while but it eventually squeezes out and leaks. Check the length of the seal first, never had one that was the correct length yet, always too long. Cut a bit of each end to align it properly in the center. Run a bead of silicon along the block, put on gasket and let it go off for a couple of minutes to go tacky (makes it harder to push out), run another bead along the top and put the manifold back in place, checking the gasket is still in place, use a mirror. A bit of silicon around the water ports won’t hurt either but put only a little. Leave the silicon to dry before filling with coolant or starting.

What's a HP motor?:

There is nothing special or different about the 179HP engine. All EHs with 179s (up to around Oct '64) have this block casting. After that date the blocks were cast '179', with no changes. When the red motor first came out the 149 blocks had no casting ID & the 179 were cast HP, probably for 'High Performance' which they certainly had when compared with the 149.

Yes, they had forged steel cranks, but so did every other Holden 6 up to April '67. (Greys & the 149/161/179/186)

Yes, they had slightly thicker cylinder walls than the 186, well of course they did, because they used the same casting moulds, but the 186 is bored slightly further. The 179 & 186 have the same maximum overbore limit of .060" resulting in a 192 ci motor.

If looking for a motor to modify these days, you're much better off with a later red or blue. These early castings are now a bit rusty in the water jacket & are probably best left to the guys who want originality for there old EH.

Dr Terry.

more discussion here [1]

Should I run my car on LPG?:

discussion http://oldholden.com/?q=node/19296

hardcore facts http://franzh.home.texas.net/lpinfo/index.htm

What is timing or ignition timing?:

Ignition timing is the position of the piston
in degrees that the spark plug fires at.
i.e. 6-degree btdc....The spark to ignite the fuel air
mixture in the combustion chamber will fire when the
piston is 6 flywheel degrees before top dead center
(its highest point).
The spark is fired before the piston reaches its
highest point in its cycle to give time for the
fuel/air mix to ignite and start to burn in a
controlled manner expanding the gasses, which then push
the piston down, thereby turning the crank .
If the spark fires too soon the expanding gasses will
try to push the piston down before it reaches tdc
(Backwards, which causes a loss in power)
If the spark fires too late, the piston will already
on the down stroke when the air/fuel ignites, being
pulled down by the crank Assembly, not being pushed
down by the expanding gasses.(again loosing power)

How do I fit an electronic distributor to my red 6? :

You can use an electronic distributor from a VH/VK Commodore. These distributors are a simple and effective way to give your old red motor electronic ignition and these units are completely self contained.



How can I improve the brakes on my old holden?

===Hoppers Stoppers article on Brake Upgrading




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