Technical FAQ

This is a compilation of technical questions asked by our customers.

Parts needed to install drivetrain

Following is a list of parts and part numbers for items commonly used to finish our cars. 427 parts are for engines in the FE family (390, 427 and 428). 289 parts are for engines in the Windsor family (289, 302 and 351W). We have tried to provide manufacturers names and part numbers. Most of the parts are available through large parts houses like Summit and Jegs. They should also be available through your local auto parts store or performance dealer.

Clutch Parts:
ApplicationDescriptionMfg & Part Number
427 w/Tremec 12 inch racing clutch Mcleod 260873
427 w/Tremec 12 inch street clutch Mcleod 260173
427 w/Top Loader 12 inch clutch Mcleod 260863
289 w/Tremec street use 10.5 X1-1/8 X 26 reverse hub Mcleod 260170
289 w/Tremec performance use 11 X 1-1/8 X 26 REVERSE HUB Kevlar:p/n updated 04MAR10 Mcleod 260571
289 w/Top Loader small input shaft, 1 1/16 10 spline Mcleod 260831
Pressure Plate:
427 w/Tremec 12 inch Mcleod 360821
427 w/Top Loader 12 inch Mcleod 360821M
289 w/Tremec 10.5 inch Mcleod 360048
289 w/Top Loader 11 inch Mcleod 360850
Scatter shield/bell housing:
427 Tremec or Top Loader scatter shield/bell housing Lakewood 15210
427 Tremec or Top Loader scatter shield/bell housing Quick Time 6057*
289 Tremec or Top Loader scatter shield/bell housing Lakewood 15200
* If you are going to use a Quick Time bellhousing with an FE engine, you must use part 6057 whether you use the top loader or the Tremec. Do not order the Tremec bellhousing. Call if you have questions.
Flywheel:
427 aluminum flywheel Mcleod 563210
Check with your engine builder for help with flywheel selection. We recommend aluminum fly wheels to keep rotating mass down.
Other Clutch/Transmission parts:
427 external clutch slave cylinder assembly Kirkham 00536
427 pilot bearing SKF B50HD
427 & 289 pressure plate bolts ARP 150-2201
427 & 289 flywheel bolts ARP 200-2802
Starters:
427 original block Powermaster 3131
427 Shelby aluminum blocks Mcleod 810160
Alternators:
427 or 289 alternator 3 wire type Power Master 7078
Ignition:
427 & 289 ignition coil MSD 8202
427 & 289 ignition coil bracket MSD 8213
427 & 289 6AL ignition box w/rev limiter MSD 6420
427 & 289 6AL-2 ignition box w/rev limiter MSD 6421
427 & 289 6 Digital+ ignition box MSD 6520
427 pro billet distributer MSD 8594
289,302 pro billet distributer MSD 8582
351W pro billet distributer MSD 8584
You will need either the 6AL or the 6 Digital+ from the list above.
Oil Pans:
427 427 cobra style pan Armondo 408
289 289 cobra style pan Armondo 406
Armando's Racing oil pans, 15476 Montana Ave. El Paso TX. 79938 (915) 849-7622
Misc. Parts:
427 header bolts ARP 100-1102
427 or 289 voltage regulator (fits an original Cobra Niehoff FF169-B
289 bell crank kit for Weber carbs Mr. Gasket 1523
289 header gaskets Fel-Pro 1415
427 or 289 fuel pressure regulator, bypassing Mallory 4309
427 dipstick (made for Chevy big block) Spectre 5720
427 air filter K & N E-2570
427 air filter K & N E-1025
427 air filter K & N E-2630
427 oil filter K&N-HP-3001
427 oil filter Fram PH8A
427 remote oil filter mount gasket (used on older Kirkham style) Fel-Pro 70135
427 water pump gasket Fel-Pro 427 11760
427 & 289 Top Loader rear transmission seal National 9613-S

Carbureted engine starting

Modern fuel injected engines generally start immediately and automatically adjust to ambient temperature and altitude conditions. They also keep themselves at the correct operating temperature. In keeping with the spirit of the originals our cars are usually carbureted and many other systems onboard are manually operated. Because of this we need a simple starting and operating procedure

With a carburetor, especially in cold weather, the fuel doesn't mix with the air as well, and the engine needs a bit richer of a mixture to start.  In older cars the choke restricted air, richening the fuel/air mix.  Our thoroughbreds usually lack a choke; so instead of blocking off the air, we need to add a little fuel. That is the theory now lets put it into action.

FIRST, we need to do a little pre-flight check. Turn on the fuel pump and listen to see if it is working. Turn on the cooling fans and listen to see if they are working. Turn the fan back off. (Remember to turn it back ON again once the engine heats up to about 80-85 degrees Celsius.)  Leave the fuel pump on and check the fuel pressure gage for pressure.  The fuel pressure should be about 5-7 psi. 

The fuel bowls should already be full from the last time the engine was run so you just need to pump the gas pedal about ½ way down 2-3 times quickly and then DON'T touch the gas pedal any more. If you touch the pedal again you risk flooding the engine.

Crank the engine until it just starts to fire then push the gas pedal down about 1/4 of the way and HOLD it there until it starts. If the engine doesn't fire, then repeat the procedure. If it doesn't start after a couple of tries then there is probably something else wrong. If it is extremely cold outside, or if you haven't driven your car in a while, you may need to pump the pedal 4-5 times instead of 2-3 on the initial priming of the engine. As you get to know your car better, you can fine tune this procedure.

Fluids

Differential

Warning: The differential covers that we use locate the drain plug approximately an inch higher than the original covers. (Original style covers are no longer available.)  Do not fill the differential to the drain plug or it will cause heat and high pressure in the diff and blow out the seals. 

3.25 pints 80W-90 NON-synthetic* gear oil + 4 oz of friction modifier additive.

85W90:
GL-6 (GL-5 is acceptable, but not preferred).  Valvoline & Mobile seem to work well.

4 oz. Friction modifier. 
Use Auburn Friction Additive (Auburn part number 504102) in differentials with Auburn gearsets and Ford Friction Modifier (Ford part number M-195-46-A12) in differentials with Dana gearsets.  Use the old petroleum based Ford Modifier instead of the newer synthetic.

*Synthetic are TOO slippery, causing the diff's internal clutches and cones to slip, chatter, and wear out.

Transmission

Tremec TKO 600

Approximately 5.28 pints Dexron III  ATF fluid.  (Dexron 3)  The transmission should be filled through the fill plug located on the passenger side of the transmission. Fill to the bottom to the plug hole.

Top Loader

Approximately 2 quarts of 75W-90 gear oil.  You can use 80W-140 gear oil in hot climates or in heavy duty applications.

Clutch

DOT 3 brake fluid. We recommend Ford PM-1 DOT 3 fluid.

Brakes

DOT 3 brake fluid. We recommend Ford PM-1 DOT 3 fluid.

Replacement Parts and Part Numbers

Part Description Part Number/Spec
Headlight bulb GE H6024 or equivalent
Parking light, turn signal, tail light, and brake light bulbs Sylvania 1157LL or equivalent
Fuel Pump Holly Red, 12-801-1
Brake Pads, Front Wilwood PolyMatrix 15Q-6829K
Brake Pads, Rear Wilwood PolyMatrix 15Q-6824K
Brake Fluid Ford PM-1 DOT 3
Clutch Fluid Ford PM-1 DOT 3
Differential Gear Oil 80W-90 NON-synthetic GL-6 (or GL-5) w/ Ford part number M-195-46-A12 3.25 pints
TKO Transmission Fluid Dexron III ATF fluid, aprox ~5.28 pints
Top Loader Transmission Fluid 75W-90 Gear Oil ~2 quarts

Bare aluminum finish care

Leaving your car in bare aluminum is a great way to show off your roadster and let others know that it isn't a dune buggy.  Most of these cars don't spend a lot of time in rain, snow, or other harsh climates so the finish doesn't see a lot of abuse but there are times when your finish may need some touch up. 

For our sanded or brushed finish we recommend water in a spray bottle and paper towels to remove dust and road grime.  If the grime is really nasty you can use Windex brand window cleaner.  (Some brands of cleaner will actually stain the aluminum so be sure to test your cleaner in an inconspicuous area of the car.)  If your car does get rained on, wipe it off if possible so that the rain will not spot the car.  Customers in smoggy areas should clean the water off quickly so that it doesn't etch into the car.

If you do get a stain or scratch in the finish, you can use sandpaper and Scotch-Brite pads to "redo" the finish.  Use red Scotch-Brite pads and a high quality 120 grit bodywork sandpaper.  You can get the sandpaper in sizes precut for a body file board (long and skinny).  If you cut these in half they will be about the length of the Scotch-Brite pad.

If the stain or scratch isn't too deep you can use the Scotch-Brite pad to clean up the finish.  Brush the finish in long straight strokes going with the "grain" of the finish.  Be careful at the end of each stroke so that you do not move across the grain.  If you do, it will leave visible scratches.  When you first start with the pad it will be "sharp" and cut well, after you use it for a while it will lose its abrasive properties.  After the pad wears in it will take a little more effort, but you can still use the pad and for most cars the finish produced with a dull pad will more closely match the finish already on the car. 

For deeper scratches or blemishes you can use the sandpaper followed by the Scotch-Brite.  Start with one of the half sheets of 120 grit paper.  Fold a Scotch-Brite pad in half length wise and use it as a backing for the sandpaper.  Again, use long straight strokes and go with the grain already on the car.  Be careful not to move the sandpaper across the grain or you will be able to see the scratches. The sandpaper will cut pretty aggressively so be cautious.  You shouldn't have to use a lot of pressure and you should not spend too much time in one spot.  Use long strokes so you don't "flat spot" the place you are trying to fix.  Once you have cleaned up the problem area with the sandpaper, use the Scotch-Brite to match the finish to the rest of the car.  It is good to tape off any chrome parts (hood handles, headlights, turn lights, etc...) so they do not get scratched.  If you are working next to a polished area, tape it off so that you will not accidentally cross over and scratch the polished finish.

For polished areas on the car you can use water or Windex and microfiber towels.  If you get a scratch or blemish in a polished area use Mothers aluminum and mag polish and microfiber towels to clean and re-polish.  Carefully clean the area with water and then dry with a clean towel.  Apply a dab of Mothers to the towel and work it into the area that needs to be polished.  Wipe off any excess polish with a clean towel.  If you are working next to a brushed finish, tape off the area so that you will not cross over and gum up the brushed finish.

Alignment specs

Alignment specs Street
Ride Height, Front 4.5"
Ride Height, Rear 5.25"
Caster Front 3-4° positive
Camber, Front -½°
Camber, Rear -½°
Toe, Front 3/32" toe in w/radial tires
Toe, Rear 3/32" toe in w/radial tires
Tire Pressure 30 psi.

Ride height is measured on a level surface from the bottom or the frame rails to the ground approximately 1/2 inch inboard of the end caps.

For track: start with above as baseline.

Choosing a transmission and differential gear ratio

Transmission

We use and recommend two different transmissions in our cars. The Ford Toploader and the Tremec TKO 600.

Toploader

The Ford Toploader transmissions are 4-speed, fully synchronized transmissions built between 1964 and 1973 in over 130 different configurations. The transmissions were built with different gear ratios, case sizes, and output shafts. The Toploader gets its name from its revolutionary (for the time) case design the put the access plate on the top of the case instead of on the side. This made the case stronger than previous designs that had the access plate on the side of the case. By the mid 1990s these transmissions were becoming fairly scarce but now there are several companies making reproduction of these gear boxes with either cast iron or aluminum cases and upgraded internal parts.  Original Cobras came with a 14" tail housing, 1 3/8” input shaft, 28 spline output shaft, and "close" gear ratios. 

For more information on Toploaders visit: David Kee Toploader Transmissions

Tremec TKO 600

The TKO 600 is a modern 5 speed overdrive transmission rated at 600 lb/ft of torque. It is available with different overdrive gear ratios, .82 and .64. We recommend the .82 ratio. The use of these transmissions require that a mount be welded to the frame.

Rear end gear ratios

Because of the wide variety of engines and the RPM range/powerbands in those engines, it is very difficult to give a one-size-fits-all recommendation for a gear ratio.  The following ratios are good recommendations for most setups.  Feel free to call us with any questions about your specific application.

Engine Type Transmission Type Gear Ratio
Small Block TKO 3.54-3.73
Small Block Top Loader 3.54
Big Block TKO or Top Loader 3.31 or 3.42

Installing Knock-Offs/Spinners/Wingnuts

Since our cars use only one “lug nut” instead of five, you might think this is a simpler method of holding the wheel and tire on the car. While it is simpler in that there is only one part instead of five, there is only one point of failure so we need to use some extra caution when removing and installing knock-offs. 

Tools needed:

Knock-off hammer or mallet
Traditionally these have been made of lead. We use a large (5 lb.) nylon mallet in the shop. Lead works well but does not last as long as nylon. We get our mallets at the local home builder supply place.

Safety wire and pliers
Safety wire is a must when properly installing knock-offs.  Use 0.032 wire.  A set of safety wire pliers will make the job of installing the safety wire easier. You can buy safety wire and pliers in kits from racing and aircraft supply stores (Aircraft Spruce and Specialty).

Anti-seize
This can be purchased at most automotive parts stores.  If you don't use anti-seize, you will experience the following:

Best case: You will ruin the rim and the knock off with galling. It is highly unlikely you will stop at best case.

Worst, and most probable case: You will seize the nut onto the hub and you will experience all sorts of new words in your vocabulary as you CUT THE WHEEL, WING NUT, AND HUB apart to disassemble the whole mess. You will be left with mess on the floor and a big hole in your wallet to fix the mess. You MUST anti-seize the threads AND the face of the knock off where it contacts the wheel face. We even anti-seize the drive pins a little.

Jack
We use a low profile racing type hydraulic jack when we are away from the shop and don't have a lift available.

To remove knock-offs and wheels start with the car on the ground. We leave the car on the ground so that the force from removing the knock offs isn't transfered directly to the bearings. Remove the safety wire from the knock-off. Loosen the knock-offs by hitting them firmly with the hammer. Remember, the knock-offs on the left side (left as if you are sitting in the seats) of the car have right-hand threads; the knock-offs on the right-side of the car have left-hand threads. If you can get a good angle it helps to strike the knock-off on different wings. Once the knock-offs loosens you can then raise the car so that you can remove the wheel and tire.

Installing the wheel, tire and knock-off is basically a reverse of the removal, but it also requires some finesse. Start by applying a thin layer of anti-seize to the drive pins and threads on the hub.  Place the wheel and tire on the hub by lining the wheel up with the drive pins and sliding it in place. Apply a thin coating of anti-seize to the threads on the knock-off and the area where the knock-off seats on the wheel. Start the knock-off onto the threads. Remember left-hand threads on the right, right-hand threads on the left. Tighten the knock-off until it starts to touch the wheel. Grab opposite edges of the tire and wiggle it side to side and up and down to ensure that it is seated on the hub and that the drive pins are engaged properly. Tighten the knock-off.  Repeat until the knock-off is as tight as you can get by hand.  You can give the knock-off a wack with the hammer to ensure that it is seated. Now you can lower the car to the ground and finish tightening the knock-off. To tighten the knock-off, strike the wing with the hammer. You should be able to feel the knock-off turn each time you strike it. When it is seated tightly the hammer will bounce back differently because the knock-off has stopped turning. It takes a little practice but eventually you will get a feel for this. Give it a few more wacks to ensure that it isn't moving anymore. You should not have to use “gorilla” force to tighten the knock-off.  The drive pins transfer the force from acceleration and braking to the wheel, the knock-off holds the wheel against the hub.  

Now it is time for the safety wire. There should be a hole in one wing of the knock-off. Run the safety wire from this hole to a spoke on your wheel.  The wire should be installed in a direction so that it is holding the knock-off tight. This wire does not hold the knock-off in place but it is used to show that the knock-off has not come loose. Please bend ALL safety wire ends over to show you care and to prevent safety wire sized holes in your hands. Besides showing that you care, it looks cool.  Never drive a car without the safety wire in place on all wheels. Checking the safety wire on each wheel should always be on your pre-flight checklist.  Remove your wheels to clean your hubs and knock-offs and re-apply anti-seize once a year to prevent corrosion (more often if you live in a damp or salty ocean climate or if you use your car to trailer a boat).

Use these answers at your own risk. Please bear in mind that there are is no connection between Kirkham Motorsports and any other entity linked to or mentioned on any of our webpages. There are no authorized Kirkham Motorsports dealerships, and we cannot certify any business we mention, nor do we warrant anyone's work. All links and information are provided purely to help you identify businesses that offer services and products you may find helpful. Carefully research any entity with whom you choose to do business with before starting anything.