Service Parts Restorations Engine/Trans/Diff Racing About Us Contact Home

Stock Rebuilds

Our stock rebuilds are assembled to BMW specifications by our experienced and dedicated technicians rather than off a mass production assembly line. Korman engines are assembled with meticulous craftsmanship, precise machining, and detailed blueprinting. All of our boring and honing is done with a torque plate for exceptional bore roundness and long engine life. 2 year/24,000 mile warranty.

3.3 liter fuel injected P/N 11033010

3.5 liter fuel injected P/N 11056010

1988/89 635csi P/N 11056020


Korman Stage 1 3.3L Fuel Injected Engine

Our Stage 1 rebuild will provide a moderate increase in power through the use of our proven performance techniques. Special valve and valve seat work, increased compression, Korman-Stahl Headers and Stage 1 cylinder head porting will net a gain of 20-25 HP depending on model. Performance computer chip suggested, not required. Engine Plus Parts Included

3.3 liter P/N 11033110


Korman Stage 1 Fuel Injected Engine (85-88 635)

These engines feature increased compression, Stage 1 cylinder head porting and polishing, increased valve spring pressure and a special computer chip to take full advantage of the engine's potential. Horsepower is increased from 182 to 215, and torque climbs from 214 lb/ft to 230 lb/ft. Engine Plus Parts Included.

P/N 11056110


Korman Stage 1 3.5L Fuel Injected Engine-Late (88-89 635csi)

Stage 1 porting and polishing, balanced connecting rods, light weight piston pins, increased valve spring pressure, and a performance computer chip increase horsepower from 208 to 222, and torque goes from 223 lb/ft to 237 lb/ft.

P/N 11056120


Stage 2 Engines


Korman Stage 2 Fuel Injected Engine (85-87 635csi)

These engines feature increased compression, Stage 2 cylinder head porting and polishing, dual valve springs with chrome alloy retainers, lightened Stage 2 connecting rods, BIG intake valves, Korman Rocker Arms, and a special computer chip. Horsepower is increased from 182 to 230, and torque climbs from 214 lb/ft to 244 lb/ft. This engine is emissions legal and as smooth as the original. Engine Plus Parts Included.

P/N 11056220


Korman Stage 2 3.5L Fuel Injected Engine-Late (88-89 635csi)

Our Stage 2 for the late 3.5L includes our Stage 2 cylinder head porting and polishing, dual valve springs with chrome alloy retainers, lightened Stage 2 connecting rods, Korman Rocker Arms, and a special computer chip. Horsepower is increased from 208 to 230, and torque climbs from 223 lb/ft to 244 lb/ft. This engine is emissions legal.

P/N 11056320



Another way of gaining horsepower and torque without affecting emissions is to increase the displacement of the M30 engine. This option is available with all of our rebuilds, please call us with your needs.

Required main components:

  • 3.3 to 3.5-block and crankshaft

  • 3.5 to 3.8-crankshaft and conversion parts

All Korman engines are priced built on your good core


E24 Engine Components

Performance Computer Chips



ECU Number

HP/TQ Gain

RPM Limit







Plug-in chip





Conversion, must send ECU for modification





124M30200A 24 pin chip

124M30200B 28 pin chip







Adjustable Fuel Pressure Regulator

This modified Bosch fuel pressure regulator allows you to adjust the fuel pressure on your 533 or 535. Increased fuel pressures can help compensate for performance modifications (chips, cams, exhaust, intake, etc.) as well as addressing some rough idle and "flat spot" problems. Improves spray patterns on older injectors.

P/N 13106020




Camshafts and Valvetrain Components


Schrick's street performance cams all give a strong increase in power across the full rev range while retaining a smooth idle. They do not require cutting for additional piston/valve clearance. They are designed to perform with the BMW original fuel injection systems.


M30 Schrick Camshafts

Schrick 284-284 duration, 10.9 mm lift. Smooth idle, no internal engine modifications necessary. Dual valve springs, chrome alloy retainers required. Performance chip strongly suggested.

>9/83 P/N 11386282

9/83> P/N 1138628201


Korman K-300 Camshafts

These popular reground camshafts feature 300 duration, 9.4 mm of lift. Due to variations in distributor drives, we must have your core in advance for machining.

P/N 11316300


Offset Adjustable Cam Gear

Resurfacing the cylinder head retards the camshaft timing. Use this gear to advance it back to specification. Machined for 1,3,5 and 7 degrees of offset. Can also be used to fine tune the power band of the engine.

M30 11/78> P/N 11318606


Camshaft Installation Kit

M30 6 Cyl. Stage 1 includes cast alloy rocker arms, dual valve springs, and chrome alloy retainers. P/N 11396430


Valve Train Components

Korman Rocker Arms

Lightened cast alloy rocker arms, contoured, peened and polished. Radiused to clear valve spring retainers with high lift cams. Sold each.

M30 6 Cyl. P/N 1133K256229


Korman Racing Rocker Arms

Similar to above, fully polished arm, pads micropolished.

M30 6 Cyl. P/N 1133R256229


Steel Racing Rocker Arms

If you need to turn high revs these steel rocker arms will give the reliability that aluminum can't provide. Proven durable on-track with consistent revs to 9000 and above with no failures. P/N 1133S256229





Aluminum Rocker Arm Locks

Designed to eliminate both the early style high tension and late style low tension rockershaft springs. Locks rocker arm into place with less friction loss than the OEM rockershaft springs. Minimizes the chance of broken rocker arms from rockershaft spring deflection. Weight is 20.8 grams each. Sold each.

P/N 11341M10M30


High Performance Dual Valve Springs

Includes center damper spring sleeve. Long life with revs to 7600 RPM. No cylinder head machining required. Fits all M30 engines.

P/N 11341204


Schrick Racing Valve Springs

Made to sustain very high spring pressures, very high cam lift, and extended high RPM use. Will maintain original tension four or five times longer than any other spring that we tested for BMW engines. Use with titanium retainers, sold each.

P/N 11341028 (inner and outer set, each)


Titanium Valve Spring Retainers

About half the weight and twice as strong as steel. Used in all our Stage 3, 4, and race engines. Weight is 12.5 grams each.

For Korman Dual Valve Springs-M30 P/N 11342002

For Schrick Racing Valve Springs-M30 P/N 11341029


Chrome Alloy Steel Valve Spring Retainers

Stronger than stock, used in all our Stage 2 engines. Weight is 21.5 grams each.

P/N 11342001


Korman BMW Valves

Swirl polished, profiled, and radiused for improved flow.

M30 6 cyl.

46 mm intake P/N 1134K257592

38 mm exhaust P/N 1134K250129


Special BIG Racing Valves-M30

Special 47 mm alloy intake valve (stock is 46 mm). Fits stock valve seat, features dished design with polished surface.

P/N 11344140


Lightweight Piston Pins

Similar to those used in our racing pistons. Nice addition to any engine job. Ten to twenty percent lighter than stock pins, suitable for full race or street applications.

M30 6 Cyl. P/N 1125K712198


Korman Modified Connecting Rods

Lightened, balanced, peened, sized, rebushed, and alignment checked. About 8% lighter than stock rods. Shipped complete with new rod bolts and nuts. Sold on an exchange basis.

M30 All (each) P/N LAB11241201



M10_Race_Motor_Con_Rods_A.jpg (35659 bytes)Korman Lightweight Competition Connecting Rods

Designed for full race use, equally suitable for the street. Super strong and light alloy composition reduces the rotating mass of your engine, reduces stress forces at high RPM. About 25% lighter than stock, can be ordered in stock sizes or custom lengths for special applications.

M30 6 Cyl. (550 grams) P/N 11241500picture shows stock rod left, competition rod right 


Polished, Krinkle Finished Valve Covers & Intake Manifolds

Parts are cleaned and glass peened for superior paint bond. Raised ribs and BMW logos are polished to a mirror finish. Krinkle finish is baked on for eveness and durability. Can be supplied with your new engine or shipped on an exchange basis. Available in black, red or blue.

  • M30 Valve Cover P/N LAB11126035

  • M30 Intake P/N LAB11126200


Heavy Duty Alternator Bushings

These heavy duty polyurethane bushings replace your stock rubber units. The stock rubber bushings collapse over time causing misalignment of the alternator, resulting in a thrown belt. Look and see if your alternator is crooked, then use these improved bushings for a long term solution.

Long Bushings (4 required) P/N 12311268433


Engine Oiling


Engine Oiling System Modifications

Modification to the crankshaft and main bearings increase bottom end oil pressure, prevent oil from pooling in cylinder head at continuous high RPM operation. Kit includes special main bearings, new oil pump with sprocket and hardware. You must ship your crankshaft to us for modification.

M30 6 Cyl. P/N 11411306


Oil Cooler Kits

Stacked plate design coolers provide as much as 9 times the surface area as conventional tube type units.


Korman Remote Oil Cooler Kits

Includes cooler, remote filter adapter, remote filter mount, filter, all necessary hoses, clamps and fittings.

3"x11" Oil Cooler Kit P/N 11424002

5.75"x11" Oil Cooler Kit P/N 11424003


Korman Competition Oil Cooler Kit

Includes oil cooler, aircraft type aluminum fittings, stainless steel braided #10 hose, remote adapter, remote oil filter mount, filter.

3"x11" Oil Cooler Kit P/N 11424100

5.75"x11" Oil Cooler Kit P/N 11424200


Heavy-Duty Remote Oil Filter Mount

Extra strength for the most demanding situations. Housing machined from billet aluminum, red anodized finish. Includes AN 10 fittings, AN 12 available on request.

P/N 1142900004


Oil Thermostat

Works with the above oil cooler kits to facilitate quicker engine warm up.

P/N 11420111 (for Korman Remote Kits 002 and 003)

P/N 11420222 (For Korman Competition Kits, AN 10 fittings)


Korman Roadsport Suspension Systems, Non Load Leveling

Our best selling suspension package is comfortable enough for daily use, yet provides substantially improved handling for winding roads and weekend club events. Kits includes four shorter, stronger springs, adjustable front and rear anti-sway bars with polyurethane bushings, and Bilstein Heavy Duty shocks front and rear. 


Height Reduction

Sway Bar Diameter

Kit P/N





633 80-81




19mm Adj.


633 '82




19mm Adj.


633, 635 '83>



22mm Adj.

16mm Adj.



Roadsport Suspension Packages, E24 with Load Leveling

We offer the option of either retaining or deleting the automatic load leveling suspension on the 635.  The suspension package which allows the continued use of the load leveling system includes 25mm adjustable front sway bar, 19mm adjustable rear sway bar, a set of 4 special lowering springs and a load leveling adapter kit for the new rear sway bar.


Roadsport Suspension, Retain Load Leveling P/N 3110635H1

If you choose to remove the somewhat troublesome/expensive to repair load leveling system, our Roadsport kit includes an elimination kit, progressive rate springs, 22mm front adjustable, 16mm rear adjustable sway bars, and  Bilstein Sport valved struts and shocks.  The pump, resevoir, fluid lines and other components pertaining to the load leveling can also be removed after installation of this kit saving further weight.


Roadsport Suspension, Delete Load Leveling P/N  3110635H2 (larger diameter 25mm front and 19mm rear sway bars available at additional cost)


Competition Adjustable Anti-Sway Bar End Links

Allows for custom tuning of front and rear anti-sway bar pre-load to suit specific track layouts. Light weight aluminum threaded centers connect right and left hand threaded joints for quick adjustments. Front links may be used singly or in pairs.

Front Adjustable Link-P/N 3102847 (fits 83> E24)


Heavy-Duty Thrust Rod Bushings

The E28 chassis and front end shimmy go hand in hand, especially with the addition of larger wheel and tire packages. This shimmy mimics warped rotors, and is most noticeable under light braking from highway speeds. The most common cause we see in our shop are the weak factory thrust rod bushings. These bushings are mounted at the rear of the strut rod, a diagonal link which helps prevent fore and aft wheel movement. Our hard rubber bushings address this problem as well as improving steering feel and "turn in". Sold in pairs.

All E24 83-89 P/N 3111567

Remember to check the condition of the entire front suspension as well as wheel balance/tire roundness and rotor run out/thickness when trying to diagnose a shimmy.


Aluminum Front Lower Control Arms

Stronger than the original cast steel arms and about half the weight. Reduction in unsprung weight improves handling.

All E24 83-89 P/N 31121310L (left) 3112310R (right)


Upper Decamber Plates

A pair of hardened aluminum plates with studs and bolts for easy installation. Increases front negative camber by about 3/4. Sold in pairs.

E24 >82 P/N  31062055

E24 83> P/N  31062056


Strut Braces

Strengthens chassis, minimizes strut tower deflection. Polished aluminum finish.  Front only.

E24 77-83 3126431

E24 84> 3130065


Front Upper Support Bearings

Always replace when installing new front springs or shocks.

630, 633 77-82 31331101663

All E24 83> 31331124508


Rear Subframe Camber/Toe Assembly

Our eccentrics allow adjustment of rear wheel camber and toe in just a matter of minutes. Enables the restoration of factory specified alignment settings, adjustable for racing. Sold on an exchange basis.

All E24 P/N 33203567L (camber or toe only, x 2 for both)



Big Brake Kits, 6/82-89 633, 635

Original Rotor Sizes (for reference)


OE Front Rotor Diameter

OE Front Rotor Thickness

633, 635



Korman Kit

Front Rotor Diameter

Front Rotor Thickness

Caliper Type



324mm Brake Conversion



4 piston Brembo

16" Wheels required


332mm Brake Conversion



4 piston Brembo Aluminum (As used on Ferrari F40)

17" Wheels required, crossdrilled rotors


345mm Brake Conversion



Ate 4 Piston

17" Wheels required, rotors are directionally vented 2-piece with aluminum hats


High Performance Rotors


  • computer designed pattern for optimal performance

  • reduced fading

  • reduced stopping distances

  • reduced brake noise

  • high performance at about the same price as a stock rotor!

635 85-89, 83-84 633 Front rotors P/N 3411P156143


Korman High Performance Brake Rotors

Available in either a computer controlled crossdrilled version with the holes chamfered to the wear limit, or in a computer controlled gas slotted version with the gas ports milled to the wear limit. Our rotors are then finish plated with cadmium. While nothing beats the appearance of crossdrilled rotors, we suggest using the gas slotted versions for true high performance and track use due to superior wear rates and brake cooling. Please specify crossdrilled or gas slotted when ordering.


Front Rotor

Rear Rotor

633, 635 83-89




High Performance Brake Pads


Ferodo Performance Brake Pads

Developed as a non-asbestos street alternative. Formulated with metallic fibers and other inorganic substances that yield a high friction level with good resistance to fade and wear. This competition grade compound is completely suitable for normal street use as the friction level is affected very little by temperature.


Korman High Performance Brake Pads

A superior carbon-kevlar material that far exceeds the capabilities of usual street performance pads.  For road, rally, autocross and track use.  Wide friction coefficient make them work well hot or cool.  Rotor friendly.



Korman High Performance





633, 635 83-89





All E24 77-82





Don't forget new brake pad wear sensors!


Other Brake Components


Stainless Steel/Teflon Brake Lines

Essential for driving schools and highly recommended for all high performance driving. Provides stronger pedal, improved modulation under hard brake usage. Eliminates expansion associated with rubber lines. Kit includes a full set of 6 lines.

All E24 9/81> P/N 34321056



Super Blue Racing Brake Fluid

A non-silicone high performance dot 4 brake fluid designed for the extreme demands of motor racing, yet perfectly suited for street applications. Sold in 1 liter cans.

P/N SUPER BLUE  (blue fluid)   (Type 200 is a yellow version of Super Blue)  P/N TYPE200


Super Blue

Dot 4

Dry Boiling Point



Wet Boiling Point




K & N Air Filters

The K & N Filtercharger is unsurpassed in filtration protection, while maintaining an air flow greater that the OEM paper filter. Constructed of a pleated special cotton fabric with aluminum screen mesh and wide rubber seals, it comes pre-oiled with a one million mile warranty. When dirty, simply clean, re-oil and reinstall.

E24 78-84 P/N 1372332005

E24 85-88 P/N 1372332005

635 '89 P/N 1372332573

K&N Accessories

K&N Oil, 8 oz.

P/N 13720008

K&N Cleaner, 32 oz.

P/N 13720032


Big Bore Throttle Body

Bore size is enlarged 3mm for a 10% increase in throttle butterfly area. Quicker acceleration and noticeably more torque throughout the midrange and top end. Especially effective when installed along with our high performance computer chip, free flow intake and performance exhaust system. Sold on an exchange basis.

633, 635i P/N 11610322 Core P/N 116163CORE


High Flow Intake System

Easy bolt on installation. Just remove the factory air filter box and install the new venturi tube. A special cone shaped K&N Filtercharger is then clamped onto the end of the venturi tube. Nice increase in throttle response, sporty induction sound. Minor drilling required. 633, 635 P/N 1371KM30


Extrude Honed Intakes

The Extrude Hone process accomplishes porting and polishing throughout the complex BMW M30 intake manifold which are inaccessible by hand tools.

ALL E24 Cylinder P/N 13EXTRUDE01


Korman-Stahl Headers

These high quality headers provide a 6-10% power increase on stock engines, much more on high performance engines. Engineered for trouble free fit and long service. Also available with ceramic thermal barrier coating (described below) for additional performance, durability and improved appearance. Headers fit manual transmission models only and include oxygen sensor fitting.


Primary Size


633 9/79-9/82

1 3/8"


633 9/82>

1 3/8"



1 3/8"



Exhaust Manifold Porting

A careful porting and polishing of the exhaust manifolds. We then precisely mate the exhaust manifold gaskets to the exhaust manifold for maximum flow. Especially effective with Ceramic Thermal Barrier Coating. An excellent alternative where headers are not an option.

All 6 cylinder P/N LAB18213006


Ceramic Thermal Barrier Coating

From Aerospace technology comes this oven baked metallic/ceramic finish that is far superior to ordinary header paints. In salt spray testing where high temperature paints lasted 40-50 hours, the ceramic coating lasted over 5,000 hours. The ceramic thermal barrier finish also coats the inside of the pipe. The thermal barrier will reduce underhood temperatures and testing has shown horsepower gains due to combustion chamber stabilization and increased gas velocity.

All 6 cylinder P/N 182110016


Korman Adjustable Short Shift Kit

Let's you select the shifter throw that suits your needs

  • Adjusts in minutes from inside your car

  • Accepts original or aftermarket gearshift knobs

  • Assembled unit saves on installation time

  • Adjustment locking mechanism

  • Replaceable, self-lubricating bushings

  • Includes shifter cup bushings and complete instructions

  • Easily installs in less than an hour

All E24 9/85>P/N 25250003

All E24 >9/85 P/N 25250004


Lightweight Steel Flywheels

Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.

All E24 P/N 11220006


Flywheel Bolts (always replace flywheel bolts when replacing the flywheel) P/N 11220616142


Sachs High Performance Clutch Components

We sell only quality SACHS clutch components. Heavy duty pressure plates feature increased clamping force for better performance with high horsepower engines, bigger tires, etc. The heavy duty light weight pressure plates feature the same increase in clamping force but the center plate, normally cast iron, is replaced with lightweight aluminum for even better performance. Heavy Duty Sport Discs feature a performance grade friction surface which is both riveted and bonded for greater strength.


Heavy Duty Pressure Plate

Heavy Duty Light Weight Pressure Plate

Heavy Duty Disc

Release Bearing

533, 535i, iS







Clutch_Line_2.jpg (42547 bytes)Stainless Steel Braided/Teflon Clutch Hose

Replace your cracked rubber hose with our more durable stainless steel braided unit. Improved clutch feel and modulation when compared to OE rubber line.

P/N 2152115667S




Korman Manual Gearbox Rebuild

We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.

P/N 232316XX

Close Ratio Rebuild P/N 23231902








Korman Standard Differential Rebuild

Differentials with normal wear don't usually require the replacement of the ring and pinion gears. Our standard rebuild includes complete disassembly, through cleaning, close inspection of all parts, replacement of all bearings, seals gaskets, crush sleeve and lock ring. Includes meticulous attention to correct gear lash, gear contact, precise pre-load of bearings and exact torque specifications. We expect our rebuilds to last well over 100,000 miles. Note: UPS can pick up and deliver your differential at your door!

630, 633 to 9/82 (side loader) 33126000

635 (all) P/N 33126082


Korman 75% Limited Slip Differential Conversion

If you race, autocross, rally, do BMW driving schools, or otherwise tend to push your car to the limit, let us convert your 25% limited slip differential to 75% limited slip. Wheel spin is reduced or eliminated, improving track times significantly. Additionally, the reduction in internal slippage lowers lubricant temperatures, helping prolong bearing life. The conversion requires special machining at our facility, making it necessary for you to ship your differential to us for modification.

75% Limited Slip Conversion P/N 33126375


Quaife Automatic Torque-Biasing Limited Slip Units

Already used in Formula 1, IMSA, SCCA and Pro Rally applications, Quaife Automatic Torque Biasing Limited Slip Units are now available for your BMW. Quaife units utilize a gear driven mechanical process to direct power at an infinitely variable rate (as opposed to a fixed 25%, 40% or 75% rate) to the wheel with the most traction. Unlike the more complicated and fragile Torsen design and the BMW OEM clutch pack limited slip units which tend to transfer power abruptly, the Quaife units are simple and rugged in design and provide a very smooth power transfer between the two driven wheels. Quaife units have proven to make as much a one second per mile difference in lap times on road courses. We can provide you with the unit for your own installation, or install it here in our facility.

P/N 3314690xx






Optional Ratio Differential Gear Sets

"My first BMW, a 1964 1800 TISA four door sedan regularly beat the performance sport cars of its day in autocrosses: E-Jaguars, Lotus Elans, Corvettes, MG Twin Cams, Porsche Super 90's, and more than a few 911's! Along with very minor engine changes, a good suspension package, wider wheels and tires, and a close ratio gearbox, my most effective "speed secret" was the change to a 4.75 gear set!"

Ray Korman


original gear ratio

suggested ratio

630, 633 to 9/81 (side loader)



633 9/81-9/82 (side loader)



633 9/82-12/83



633 12/83>



635 to 6/87 all



635 6/87> 5-Speed



635 6/87> Auto








Korman Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406