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ABOUT OUR HEADS It's often been said
that the Crank-Shaft is the heart of an engine and the Cam-Shaft
is the Brains.....Well with regards to the Cylinder-Heads.....the Valve
Guides are the Heart of the Heads. We do something at Pro-Weld that is very different from any other Performance
Cylinder-Head Shop.....We replace every Valve Guide and Valve Seal
from the start. No extra charge here or there, and we don't wait till the customer purchases a higher Stage Head
to do it. WHY??? Why.., is it that we feel this is such an important step?? The GUIDE
is the Heart of the Head, without it, the head will fail to due it's job, and you will not be happy nor get
any Performance. As Performance Cylinder Head Standards go, the Valve
Guide should be replaced every time, and right away....Because every other Performance Up-Grade that follows
is indexed off that Valve Guide. So, if you were to leave in the old guides, then start
the re-building process, you would be building everything from that point forward on a falsehood. Kind of
like putting new Pistons in and leaving the old rings alone....It just doesn't make sense, not to me or you!
We use the best Bronze Valve Guides made....Why? Why not.? Shouldn't the main part,
the heart of the Cylinder-Head, be made of the best materials, and of the best design.?? Of-coarse they should...and
that is why we only use K-Line Bronze Valve Guide Liners. We take no short-cuts, so you
don't have to worry. This is a section from the K-Line
web site, hopefully it further sheds more light on this subject. Continued
advancements in the tooling and installation process means that we can produce premium quality valve guide repairs, and upgrades,
in the most efficient manner.
Since the early 1970's K-Line has run numerous dynamometer tests in conjunction with major production engine
builders and O.E.M.'s. Repeatedly the Guide-Liners and has out performed cast iron guides and has become the approved
method for rebuilding. In fact, these tests have found the Guide-Liners to be up to three times more durable than cast iron.
Further more, the minimisation of both guide lubrication and guide to stem clearances have failed to induce either a seizure
or cause metal transfer. Ford, G.M., Caterpillar,
Cummins, White Engines, Detroit Diesel-Allison and others have tested the product and confirmed K-Line's Guide-Liner system
as an approved product for use in rebuilding their engines. | 
Fitting and Fettling Liner Shown in Red
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Our best result was with one customer who, after 50,000 on his BSA A10, still had 2 and a half thou or less clearances
valve to guide. Less than they would have been when they left the factory. Standard replacement such as those Norman Hyde
sells, guides run at clearances of 2 to 3 thou. Same as the the tolerances on the new 1999 model Harley-Davidson and others.
The standards of early original factory parts can sometimes even be as bad as the parts they are replacing, so it is worth
checking that your parts supplier knows what they are selling you.
Closer Tolerances
Valve to Guide
Offer a Number of Benefits
to the Owners of Classic, Vintage, High Mileage or Racing Vehicles- As the rocker action on the tip of the valve places lateral forces against the guide and wears it into an oval,
it also forces the head, or rim, of the valve to cut into the newly cut cylinder head seats. Reducing tolerances minimises
this making for a longest lasting head,
- They
also allows for a greater transfer of heat from the valve to guide and away into the head and stops oil and air being sucked
down the side of the guide. With unleaded petrol running at far higher temperatures, in hot climates or in racing conditions,
this is good news,
- Improved fuel economy and
cooler running,
- Quieter running, increased responsiveness,
some racers claim that their engines now tick over for the first time. Greater vacuum created in the inlet port in engines
improves all round general performance to the point of requiring re-calibration of the carburettors.
Anyone and Everyone can Benefit from K-Liners. |
At low to mid range cam lift there is a huge vacuum in the inlet port as the engine tries to pull the volume of
mixture in the inlet port through a tiny gap between valve and seat, a flow that is improved by a 3 or 5 angle cut. On high
revving modern engines, 10,000rpm or more, this is also true of the exhaust port where exhaust gases are escaping along the
pipe draw by the gases of the last stroke.
The engine
under these circumstances is trying to draw air from any available source, including down the side of guide with its inevitable
oil mist included. Narrowing the gap reduces this and requires the engine to take gases from where it should be taking them;
through the carburettor or out of the chamber. To
avoid petrol wash, where too much petrol is drawn through the engine washing away all the lubricant and causing premature
wear, it is necessary to lean out the mixture by always reducing the slide size and sometimes the needle jet.
With
K-Line Guide-Liners fitted, matched to quality new or refaced valves and freshly cut seats, we guarantee owners to return
2 to 3 times the mileage one would expect. One racing head we set up, a championship leader, did 3 seasons without need a
head job and still was still in better shape that it would have been straight from the factory at the end of it season. Nothing
more than a light lapping with Solvol Autosol was necessary to send it out for its fourth year racing.
More recent tests have shown that K-Line's Bronze-Bullet Interrupted Spiral phosphor-bronze
Guide-Liners exhibited 41% less wear than smooth wall liners, as used by other tuning shops, under harsh durability testing
environments even at similar tolerances. K-Line manufacture and stock the only complete selection of Guide-Liners and Guide-Liner
installation tooling in the World. Due to our many years
of successful adoption of this technology, any problems in wear following the fitment of K-Liners or Nucleus Sports Elite
Valves can be traced to the lack of carburettor adjustment. The penultimate combination would be to have Nucleus Power Guides
fitted with K-Line Guide-Liners. Bespoke fit, incredible heat transfer and many other individual benefits for differing models. |
We use quality
components at Pro Weld, like Comp Cams, Manley valves & Engine Parts, ARP Studs & Bolts and Fel-Pro Gaskets.
Yes, all these parts are expensive, but they also represent some of the best parts the industry has to offer for the Ford
4.6L & 5.4L engines. Pretty much, this is what we use in ALL our Heads and Engines, if you have a problem with quality,
top shelf parts, then you most likely won't like what we do here.....Save yourself and me some unwanted frustration and
go somewhere else....they will be glade to do the work and install crap parts, and I think both of us will be better off.
On the other hand......if quality and performance is what your after, then by all means....look
us up and let me know what you have in mind.
The Ford 4.6L DOHC
32-Valve Engine
With very few exceptions, almost every used 4-Valve
head I've taken apart suffers from extreme carbon
build-up under the valve head and up the neck. This build-up robs more power from your engine than any other
single problem I can think of. More than poor timing, a weak fuel system, bad O2 sensors or even a out of
calibration mass air sensor. This excess build-up is the equivalent of a plugged air filter and valves that only open
2/3's the normal rate !.!.! If you have a 4.6L 4-Valve and the performance just seems to have gone away, then you
most likely have extreme carbon build-up.
The supercharged engines were the worse, the combination of low miles driven, too many people that like to hear that big blower,
and excess oil mist from the valve covers that were not filtered all helped to create the problem. In really bad instances,
mainly worn engines, the oil mist (blow-by) can actually clog the small passages in the inter-cooler which sits below the
blower and further starve the engine for air. The problem is,... this usually evolves slowly, over time and the owner
doesn't realize the power loss or when he does, they think they have just gotten used to the power and now it feels
flat. Well, you haven't gotten too used to the power....it is just plain flat and starved for air. I bring
this up because while most 4.6L owners contact us about bigger, more efficient heads. What they really need is
a basic overhaul with some minor performance parts thrown in. I know what your thinking.....Why would I tell you this?
and, Why not just sell the customer some high dollar heads they really don't need?? All I can say is... I'm
just not like that....Yes, there are people that can put to use some BIG heads, and we have them, but most don't
need that, and we got them covered too.
Call us today and let's discuss your performance
needs!
STAGE 1
Stage 1 Goes over the complete head
and reconditions it back to "Near New" standards. Plus, you get Brand New Bronze Valve Guides!!
Stage 1 Includes the
services and labor to perform the above, it does not include any replacement parts, special machining or added extras. This process is a great way to recondition you used heads to near factory standards.
Stage
1 Includes the services and labor to perform the above, it does not include any replacement parts, special
machining or added extras. This process is a great way to recondition
you used heads to near factory standards.
VALVE
SIZES:
Intake Valve: 37.0mm (1.457") Exhaust Valve: 30.0mm (1.181")
STAGE 2
STAGE 2 $ 1289.00
Everything listed in Stage 1 plus New OEM type Valves, Springs, Retainers and
Locks. This Stage provides you with everything needed to completely rebuild your used heads to better then
new factory standards. You get a 5-Angle Valve Job and we Blue-Print
the Head to compliment those new valves, this is the best bang for the buck in stock used heads. You can expect
around 10 extra CFM and 15-20 extra ponies with this Stage.
VALVE SIZES:
Intake Valve: 37.0mm (1.457")
Exhaust Valve: 30.0mm (1.181")
STAGE 3
STAGE 3 $ 1789.00
Everything Listed in Stage 2 but now all the Hardware is Performance Street or Race in nature. The valves are high quality REV , Ferreira or Manley Stainless Steel. The Springs,
Retainers, and Locks are CompCams or equivalent.
This is a huge step up from STAGE
2, and you can expect to feel the difference. The new valves are swirl polished and really help with air movement,
this stage Gaines you roughly 20-25CFM and 25-35 extra ponies.
VALVE SIZES:
Intake Valve: 37.0mm (1.457")
Exhaust Valve: 30.0mm (1.181")
STAGE 4
STAGE 4 $2489.00
Here you get everything in Stage 3 plus now the Primary Intake
Ports are Matched Ported and Fully Polished, using a textured finish. This is used to help increase
Air/Fuel atomization and prevent the fuel puddles from forming in the intake runners.
The Exhaust
Ports are Match Ported
and fully polished, they utilize a smooth finish to help prevent carbon deposits from forming.
Expect roughly 30-40CFM
and 40-50 extra horsepower at this stage.
VALVE SIZES:
Intake Valve: 37.0mm (1.457")
Exhaust Valve: 30.0mm (1.181")
STAGE 5
. Here you will see 40-50 CFM improvement over stock heads
and approximently 50-75 more horsepower.
VALVE SIZES:
STAGE 5 $ 2789.00
Again you get all of Stage 4 plus now we insert larger valves. Both the Intake
and Exhaust valves go up 1mm in diameter, while this might not sound like
much the end result is better breathing and more power
Intake Valve: 38mm (1.496")
Exhaust Valve: 31mm (1.220")
STAGE 6 STAGE 6 $ 2989.00
Stage 5 plus now we do a Full Port and Polish
Job. The extra diameter of the larger valves Plus the larger cavities and bowls of the intake and exhaust
passages really make a huge difference on the flow capabilities. These heads will work excellent on any form of forced induction,
from Turbos to Superchargers these heads will flow the big numbers required by both racers and dedicated hot street cars.
Expect 50-65 CFM and 75-100 more horsepower over stock heads. VALVE
SIZES:
Intake
Valve: 38mm (1.496") Exhaust Valve: 31mm (1.220") Intake Valve: 38mm (1.496") Exhaust Valve: 31mm (1.220")
All the following prices are based on you suppling the heads....We do sell complete
heads, which have been modified and are listed at the bottom of the page. If we have a core in your stock, we can use
that to modify to the STAGE you wish, then you can send us back your useable heads when you swap them out. You core
charge will then be refunded.
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$689.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 1
$589.95
PN-DOHC-001 Stage 1: Stage 1 DOHC: Universal Quantity: 1
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$1289.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 2
$889.95
PN-DOHC-002 Stage 2: Stage 2 DOHC: Universal Quantity: 1
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$1689.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 3
$1589.95
PN-DOHC-003 Stage 3: Stage 3 DOHC: Universal Quantity: 1
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$2489.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 4
$2489.95
PN-DOHC-004 Stage 4: Stage 4 DOHC: Universal Quantity: 1
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$2789.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 5
$2789.95
PN-DOHC-005 Stage 5: Stage 5 DOHC: Universal Quantity: 1
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STAGE 6
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$2989.00
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$2989.00
4.6 & 5.4 Ford DOHC '99-Up Heads
STAGE 6
$3189.95
PN-DOHC-006 Stage 6: Stage 6 DOHC: Universal Quantity: 1
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