M30 "Big Six" Complete Engines
2.5, 2.8, 3.0, 3.3, 3.5, 3.7 Liter
Korman offers 4 basic rebuilding configurations for the M30 engine, Stock, Stage 1, Stage 2, and Stroker Engines. All our street engines come with a 2 year/24,000 mile warranty.
All the listed engine packages are 50 State emissions legal unless otherwise noted
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 is done with a torque plate for exceptional bore roundness and long engine life. These hand built engines are available at prices comparable to a factory reman units which offer only 12 month/12,000 mile warranties.
2.8/3.0 liter carbureted P/N 11006000
2.8/3.0 liter fuel injected P/N 11006010
Stage 1 Engines
Korman Stage 1 Fuel Injected Engine-2.8/3.0 Liter
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.
2.8/3.0 liter P/N 11006110
Stage 1 Engine-Carbureted-2.8/3.0 Liter
We utilize a moderate increase in compression ratio, special valve and valve seat work, a special distributor, sport coil and Stahl headers to obtain maximum efficiency and performance from the stock camshaft. Horsepower is up from 170-180 (depending on model) to 205 HP. I you have had some of the usual headaches with the Solex (euro 5,6,7 series) or Zenith (2800, 3.0, Bavaria, CS models) you may with to fit our Weber 32/36 downdraft conversion. The package includes all necessary linkage, hoses, fittings, and air cleaners. Single carb Solex models will require a different intake manifold and additional linkage pieces. Please specify year and model.
Stage 1 Carbureted (original carb) P/N 11006100
With Weber 32/36 DGAV Conversion P/N 11006114
With Weber 32/36 DGAV Conversion (with manifolds and special linkage) P/N 11006115
Stage 2 Engines
Stage 2 Engine-Fuel Injected-2.8/3.0
These engines include the Schrick 284 camshaft for power ratings of 235-250 horsepower depending on model. Stage 2 porting and polishing, Korman Rocker Arms, dual valve springs, chrome alloy valve spring retainers, oiling system modifications and stage 2 connecting rods also included.
~Not emissions legal~
2.8/3.0 liters P/N 1106220
Stage 2 Engine-Carbureted
Our most popular performance rebuild for carbureted M30 engines. Produces 250 smooth, reliable horsepower (3.5 liters).
These engines also receive our Stage 2 cylinder head porting and polishing, Stage 2 connecting rods, and engine oiling system modifications. Substituting the Schrick 284 cam yields 240 HP (3.0 liter), 250 HP (3.3 liter), and 260 HP (3.5 liter).
~Not emissions legal~
2.8/3.0 liter P/N 11006200
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:
All Korman engines are priced built on your good core
M30 Engine Components
Camshafts and Valvetrain Components
These are 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.
Schrick performance camshafts are not emissions legal. Sold for off road use only.
M30 Schrick Camshafts
Schrick 282-282º duration, 10.6 mm lift. Smooth idle, no internal engine modifications necessary. Dual valve springs, chrome alloy retainers required. Performance chip strongly suggested.
>9/83 P/N 11316282
Korman K-300 Camshafts
These popular reground camshafts feature 300º duration, 9.4 mm of lift. Capable of 240+ HP in carbureted M30 engines.
>1984 P/N 11316300
Core Charge P/N 1131CORE
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 > 10/78 P/N 11316006
Camshaft Installation Kits
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
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.
High Performance Dual Valve Springs
Includes center damper spring sleeve. Long life with revs to 7600 RPM. Will fit over 79> small valve seals. Must update guides and seals on older heads. No cylinder head machining required. Fits all M30 and M20 engines. M20 requires use of our titanium valve spring retainers, below.
Schrick Racing Valve Springs
Made to sustain very high spring pressures, very high cam lift, and extended high RPM. 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. Fits M10 and M20 engines.
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.
Korman BMW Valves
Note: M20 engines manufactured before 12/86 have 40 mm intake and 34 mm exhaust valves. Upgrading to the sizes below offers a nice increase in flow, provided your cylinder head ports are enlarged to take advantage of the bigger valves.
Swirl polished, profiled, and radiused for improved flow.
Special alloy, polished dished design.
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.
Pistons and Connecting Rods
High Compression Pistons
In addition to standard pistons, we offer the following special pistons. All piston sets include rings, pins and clips. You must provide your bore size when ordering.
M30 9.1:1 P/N 112508258
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
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 11241500
Heavy Duty Alternator Bushings
Replace your soft stock rubber bushings with these heavy-duty units.
Long P/N 12311268432 (2) required
Short P/N 12311268433 (2) required
E3/E9 Oiling System Improvements
Spin-On Oil Filter Conversion
Eliminates the mess and difficulty of changing the cartridge filter. Replaces your cartridge oil filter with an easy spin-on filter. Bolt on conversion, ready to install. Uses Fram HP-2 filters.
All E3/E9 through '76 P/N 11410076
Replacement Filters P/N 1141HP2
Engine Oiling System Modifications
Modification to the crankshaft and main bearings increase bottom end oil pressure, prevent oil from pooling in the 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
Our 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 11426002
5.75"x11" Oil Cooler Kit P/N 11426003
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 11426100
5.75"x11" Oil Cooler Kit P/N 11426200
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.
Remote Adaptor Block-Off Plate
As included in our kits above.
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 recommends Redline Synthetic Lubricants for your BMW
Korman Roadsport Suspension Systems
Our best selling suspension package is comfortable enough for daily use, yet provides substantially improved handling for winding roads and weekend club events. Kit includes:
-Front and Rear Bilstein Heavy Duty Valved Shocks
-Front and rear sway bars with polyurethane bushings (rear bar adjustable)
-Four lowering springs
Upper Decamber Plates
A pair of hardened aluminum plates complete with studs and bolts for easy installation. Improves front camber by about 3/4 degree.
2500, 2800, 3.0CS, Si, Bavaria to '74 P/N 31062055
Upper Support Bearings
2500, 2800, 3.0 P/N 31331101663
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.
P/N 33203567 (camber or toe only, x 2 for both)
Polyurethane Rear Trailing Arm Bushings
Replaces your soft stock rubber bushings. Kit includes set of 4 bushings and metal sleeves.
E9 Strut Tower Brace
Our strut brace has a brushed stainless steel cross bar with billet aluminum ends. There are NO swivels or hinges. It fits all E9 coupes both with carburetors and fuel injection. The stock air cleaners fit well with the Zenith carburetors but with the Weber DGV down drafts the stock air cleaner hits the strut brace. We suggest using the smaller individual air cleaners with Weber DGV conversion. P/N 31361009
Rear Shock Tower Brace/Battery Mount Kit
Triangulates and reinforces rear shock towers (load bearing on the E9 chassis) and provides secure battery mount for relocation.
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.
2500, 2800, 3.0CS, S, Si, Bavaria Front P/N FDB34
3.0 CS, Si, Bavaria Rear P/N FDB162
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.
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 E3/E9 P/N 34321016
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.
Weber Downdraft Conversion-2.5, 2.8, Bavaria, 3.0, CS
Two Weber twin choke downdraft carbs bolt to your stock manifold to replace those troublesome, hard to tune and expensive to repair Zeniths. Our kit includes a water heated choke mechanism that connects to the original Zenith water choke fittings. The progressive linkage gives excellent fuel mileage. The mechanically operated secondary opens quicker than the vacuum controlled Zenith and provides smooth quick acceleration. We do not represent this as a high performance conversion. The throttle area of these Webers is not greater than the Zeniths. You get easy tuning, low maintenance, fuel economy, and quick initial throttle response but for more horsepower you must use the side draft Webers. This has been a very popular kit and most customers just wish they had installed them sooner!
Includes two DGAV carburetors, base gaskets, two idle solenoid valves, complete linkage assembly, top quality air cleaners, fuel lines, water hoses and clamps. Detailed instructions are provided.
Air filter housing adapter plates-Allows use of original air filter assembly. 2 required.
Triple Weber 40 DCOE Sidedraft Conversion-M30
Three sidedraft 40DCOE carburetors on a special manifold completely change the character of your 6 cylinder sedan or coupe. There is an awesome amount of torque and horsepower in every big six and this package brings it all out. This kit produces astonishing results with a completely stock, unmodified engine. When combined with our headers and mechanical advance distributor you realize even more of your engine's potential. Not for the timid! You should definitely consider suspension and brake modifications to utilize this power safely.
Includes three Weber 40 DCOE sidedraft carburetors, Korman 1 piece intake manifold with balance ports, complete linkage assembly, choke cable, top quality air cleaners, fuel line, fittings, water hoses, water by-pass pipe, and detailed instructions. Will perform well with automatic transmission. Korman will custom jet your kit to match your engine as closely as possible, please provide all the details about your engine when ordering.
Triple Weber 40DCOE Kit P/N 13406006
Triple Weber 45 DCOE Sidedraft Conversion-M30
Same complete kit as the 40 DCOE kit above but with 45 DCOE Webers. Not suitable for stock 2500, 2800, 3.0 or 3.3 engines. Application is for stock and modified 3.5 engines and very high output 3.0 and 3.3 engines. Requires extensive porting to heads and manifolds.
Triple Weber 45 DCOE Sidedraft P/N 13456009
Triple Sidedraft Modified Thermostat Housing
The stock thermostat housing does not have sufficient clearance once the Weber carbs are installed. We offer this modified housing which replaces the original unit without any clearance problems.
Stainless Steel Braided Fuel Line
Assembled, ready to install stainless steel fuel lines with aircraft type fittings. Includes fuel filter and standard fuel pressure regulator. (pictured above)
M30 P/N 13006125
Electronic Fuel Pump
Reliable and compact electronic fuel pumps designed for use with Weber carburetors. Complete with hose fittings and wiring instructions. Must be used with fuel pressure regulator.
Standard Fuel Pressure Regulator
Adjustable from 1-5 psi. When used with the above pump it delivers the correct flow and pressure and quick surge capacity for high performance engines. Packaged complete with brass fuel fittings.
Bypass Fuel Pressure Regulator
Permits use of original fuel injection electrical fuel pump with carburetor conversions. Must be used between original fuel pump and before standard fuel pressure regulator.
Synchronizes your multiple carburetors to assure best performance, economy, and emissions. Simple precision device enables quick and accurate tuning. Complete with instructions.
Not only balances multiple carbs but it is also calibrated to measure air flow in kilograms per hour. Imported form West Germany. For all Weber and SK carbs.
K & N Filterchargers
K & N Filterchargers for Stock Air Boxes
K & N Accessories
UNI Air Cleaners
The original "POD" air filter. Cylindrical foam element. A heavy gauge steel spring maintains shape and prevents collapsing. Our dyno tests have proven this filter produces higher horsepower than the Lynx or K & N. Heavy rubber base with stainless steel clamp fits securely over air horns. Use one filter per carburetor.
ITG Air Filters
This new air filter permits use of short air horns inside for improved power. The red fiberglass reinforced plastic frame is covered with two layers of foam for a two stage filtering process. It seals better than the Lynx type filter and provides greater flow. Fits both Weber and SK side draft carbs. From England.
Lynx Air Cleaners
A high quality foam element/chrome mesh air cleaner made in Australia, specially designed to clear the BMW brake booster assemblies. After extensive testing we found no other unit to come close in function and appearance. The filter element can be cleaned and re-used and we also stock replacement elements. Use one filter per carburetor.
Factory Weber Service Manual - 32/36 DGV, DGAV
Factory Weber Service Manual - DCOE Series
HP Weber Manual (all models)
Korman stocks many hard to find Weber Carburetor parts including rebuild kits, chokes, jets, etc. Call us with your needs!
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.
Notes: (1) Connector length to the center resonator pipe must be shortened. If a 4 speed model has been converted to a 5 speed, must trim the edge of the transmission support bracket. (2) Only for 3.0, 3.3, 3.5 engines over 270HP, must radius edge of engine casting for clearance.
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
All E3/E9 with new style shifter 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 E3/E9 P/N 11220006
Precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength, heat-treated aluminum, with a steel friction surface retained by aircraft structural screws. The insert is stress relieved, blanchard ground, precision drilled, countersunk, and heat-treated. It is far superior to spray-on type friction surfaces and can be replaced when worn. Kit includes aluminum flywheel, flywheel bolts and anti-galling plate. Total flywheel weight is 8.9 lb.
All E3/E9 P/N 11121840K
Flywheel Bolts (always replace flywheel bolts when replacing the flywheel)
All E3/E9 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.
Stock Clutch Kits
All new (no reman) kits include stock pressure plate, disc and release bearing.
3.0, 3.0CS, S, Si,Bavaria '74> P/N 2121000004
Guibo Update Kit
Allows replacing the weak solid rubber flex disc with the new style reinforced type. Replaces BMW P/N 26111107832. New style guibo and all necessary hardware included. Manual transmission only.
72-76 Bavaria, 3.0, 3.0 CS, Si, S P/N 26111UPDATE
5 Speed Overdrive Conversion Kit
These complete kits allow you to install a later model five-speed overdrive gearbox into your early model four-speed BMW. The first four gears are nearly identical ratios as your original four-speed. The additional fifth gear drops engine speed about 20% for improved fuel mileage and less engine wear.
Our kit includes the BMW remanufactured five-speed gearbox and necessary shift linkage, shift support and shifter bushings. The price includes the cost of shortening and re-balancing your present driveshaft which you must ship to us.
Complete 5 speed Overdrive Conversion P/N 232350300
Korman Manual Gearbox Rebuild
2 year/24,000 mile warranty
We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.
Korman Standard Differential Rebuild
2 year/24,000 mile warranty
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!
Early Style Differential Rebuild (sideloader) P/N 33126000
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.
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!"
Call us for recommendations, pricing and more information on upgrading your differential.
Korman Autoworks recommends Redline Synthetic Lubricants for your BMW
Engine Bay Decal Sets
A set of engine bay decals to refresh your Coupe’s engine bay. Perfect for dressing up your engine bay or when you repaint your engine bay. Please provide your VIN number, paint color code and if your Coupe2 has air conditioning when ordering. P/N 51 DECAL 3.0CS
Hood Insulation Kits
Our self adhesive hood insulation kits are pre-cut and feature a mylar outer layer for ease of cleaning, long life, and improved appearance. Self sticking adhesive backing. State model of car when ordering.
Quartz Halogen Headlight Conversions
For off road and racing applications only. Competition proven by rally racers and off road racers around the world.
Direct plug-in replacements for your sealed beam units. No additional wiring required.
High Beam 5 3/4" round, 4 headlight system P/N 71456
Low Beam 5 3/4" round, 4 headlight system P/N 71156
The Cockpit Line introduced the motoring world to new standards of accuracy and reliability with styling designed to enhance any instrument panel. This full line of instruments features matte black faces, white characters and red pointers. Efficient illumination provides instant day or night readability. Whatever instrumentation your automobile or driving style requires, you will find it in the VDO Cockpit Line. Bulb covers are available to match your existing gauge illumination.
© Korman Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406