BMW M88/3 3.5-Liter Inline-Six Engine Long Block & Parts Collection
Euro BMW M635CSi | Assembled Long Block + Extensive Spares
This collection of BMW M88/3 3.5-liter inline-six engine components originates from two mid-1980s Euro-spec BMW M635CSi donor cars acquired by the seller between 2001 and 2003. Included is an assembled long block mounted on an engine stand along with a substantial assortment of original and spare components from both engines.
The M88/3 is the high-performance European variant of BMW’s legendary M88/S38 family, featuring individual throttle bodies and motorsport-derived engineering.
Assembled Long Block Details
The assembled long block was completed in September 2003 by Carlquist Competition Engines of Watertown, Connecticut.
Block & Rotating Assembly
Engine type: BMW M88/3 inline-six
Displacement: 3.5 liters
Cast-iron engine block
Factory bore and stroke retained
Original BMW crankshaft
Original connecting rods and pistons
Replacement piston rings installed
Frank Fahey Motorsports front crank hub fitted
Cylinder Head & Valvetrain
Factory BMW camshafts
Replacement dual valve springs
Replacement bucket lifters
The seller notes that the rotating assembly was periodically turned during storage.
Donor Engine Background
Engine 1 – Connecticut M635CSi
Vehicle was wrecked; engine sustained damage
Damage noted to crank snout, block, and tubular headers
Pistons, rods, and pins from this engine were used in the assembled long block
Included components from this engine:
Single tubular header
Airbox with damaged intake
Engine 2 – Arizona M635CSi
Vehicle crash reportedly did not impact the engine
Engine purchased disassembled circa 2002
Crankshaft shipped installed in the block
Pistons, rods, and pins shipped separately
Supplied numerous new and spare components
The assembled long block combines:
Block, crankshaft, and oil pan from the Arizona engine
Cylinder head, pistons, and rods from the Connecticut engine
Carlquist Competition Engines selected compatible components from both donor engines during assembly.
Included Spare Parts & Components
Two-piece Euro “bundle of snakes” tubular headers
Cuts and welds present after the collector
Additional header section
Airbox with damaged intake
Oil pan
Gaskets
Dual valve springs
Various ancillary engine components
Miscellaneous original and new parts accumulated with both engines
Condition Notes
Long block assembled in 2003 and stored since
Rotating assembly periodically turned during storage
Headers show prior modifications
Airbox intake damage present
Parts offered as a collection
Highlights
Genuine Euro M88/3 engine components
Professionally assembled long block
Combination of two M635CSi donor engines
Frank Fahey Motorsports crank hub
Extensive spare parts inventory
Ideal for restoration or motorsport projects
Ideal Applications
Euro BMW M635CSi restoration
BMW M88/3 / S38-based performance builds
Period-correct BMW M powertrain projects
Engine rebuild core with extensive spares
This BMW M88/3 engine long block and parts collection offers a rare opportunity to acquire a professionally assembled core alongside a deep inventory of original and spare components from two period-correct Euro M635CSi donor cars.
Guillaume Delorme (verified owner) –
Mon garage a installé le moteur en une journée seulement grâce à la parfaite compatibilité des pièces.
Edouard Fleury (verified owner) –
Le kit carrosserie donne un aspect beaucoup plus sportif à ma BMW. Les ajustements sont excellents et la finition est remarquable.
Guillaume Marchand (verified owner) –
Je recommande cette boutique à tous les propriétaires de BMW. Des pièces de qualité, une équipe compétente, une livraison rapide et un service client irréprochable.
Rebecca Turner (verified owner) –
Excellent communication throughout the entire process. Every question I asked was answered quickly, and shipping updates were provided until delivery.
Pascal Boucher (verified owner) –
La boîte de vitesses fonctionne parfaitement depuis son installation. Aucun problème après plusieurs centaines de kilomètres.
William Carter (verified owner) –
The replacement engine started immediately after installation. Performance has been excellent with no leaks, unusual noises, or warning lights.
Charlie Foster (verified owner) –
I purchased a transmission for my 528i, and it’s been performing perfectly since installation. Gear changes are smooth, and the vehicle drives better than it has in a long time.
Amber Hughes (verified owner) –
The body kit gave my BMW a much more aggressive appearance while maintaining factory-quality fitment. I couldn’t be happier with the results.
Victoria Hayes (verified owner) –
The body kit completely transformed the appearance of my car. Every panel lined up well, and the overall quality is outstanding. I’ve received compliments everywhere I go.
Gabriel Carrasco (verified owner) –
I was impressed with how securely everything was packaged. Every part arrived in perfect condition, and shipping was much faster than expected.
Laurent Barbier (verified owner) –
J’ai déjà effectué plusieurs commandes sur ce site, notamment un moteur, des jantes et des éléments de carrosserie. Chaque commande s’est déroulée sans le moindre problème.
Alexis Hubert (verified owner) –
J’ai acheté plusieurs pièces pour remettre en état ma BMW après un accident. Tout s’est parfaitement monté et mon carrossier était impressionné par la qualité.
Juan Mendoza (verified owner) –
Purchased a front bumper for my M Sport, and the fit was absolutely perfect. The finish was excellent, and all mounting points lined up just like the original. Couldn’t be happier.
Christopher Ward (verified owner) –
I’ve purchased several BMW engines over the years from different suppliers, and this has been one of the best experiences. Honest descriptions, quality products, and professional service.
Eduardo Ponce (verified owner) –
I’ve ordered multiple BMW parts from this company over the past year, including wheels, suspension components, and an engine. Every order has been accurate and delivered on time.
Laurent Barbier (verified owner) –
J’ai déjà effectué plusieurs commandes sur ce site, notamment un moteur, des jantes et des éléments de carrosserie. Chaque commande s’est déroulée sans le moindre problème.
Neil Harrison (verified owner) –
The replacement fender was an exact match for my original one. My body shop had no trouble fitting it, and the final result looks factory installed.
Nicolas Aubry (verified owner) –
Le moteur tourne parfaitement depuis plusieurs semaines. Aucune fuite, aucun bruit anormal et une consommation tout à fait normale.
Simon Bennett (verified owner) –
I’ve now ordered multiple BMW parts from this company over the past year, and every order has been accurate, well packaged, and delivered on time.
Laurent Barbier (verified owner) –
Très satisfait de mon achat. Le pare-chocs avant s’adapte parfaitement et la qualité de fabrication est excellente. La livraison en France a été rapide et le colis était très bien protégé.
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This has become my go-to source for BMW parts. Great prices, excellent communication, reliable shipping, and high-quality products that fit exactly as expected.
Jean Dupont (verified owner) –
Je recommande cette boutique à tous les propriétaires de BMW. Des pièces de qualité, une équipe compétente, une livraison rapide et un service client irréprochable.
Romain Vincent (verified owner) –
Mon garagiste m’a confirmé que toutes les pièces correspondaient aux spécifications d’origine. Cela a considérablement facilité le montage.
Kayla Simmons (verified owner) –
I appreciated the detailed product descriptions and clear photos. Everything I received matched exactly what was advertised on the website.
Jean-Paul Parisot (verified owner) –
J’ai commandé un moteur complet pour ma BMW Série 5 et je suis très satisfait. Le moteur est arrivé propre, parfaitement emballé et conforme à la description. Mon mécanicien l’a installé sans aucune difficulté.
Olivier Delmas (verified owner) –
J’ai acheté plusieurs pièces pour remettre en état ma BMW après un accident. Tout s’est parfaitement monté et mon carrossier était impressionné par la qualité.
Martin Hughes (verified owner) –
I’ve ordered brake pads from several suppliers before, but these were by far the best quality. Installation was easy, and braking performance is excellent.
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This has become my preferred supplier for BMW parts. Reliable service, quality products, competitive pricing, and professional communication make every purchase a smooth experience.
Christopher Ward (verified owner) –
The engine compression tested very well before installation, and the mechanic was impressed with its condition. The vehicle now drives like it did when it was new.
Óscar Cifuentes (verified owner) –
The replacement transmission was exactly as described. After installation, the car shifts smoothly, and there haven’t been any issues at all.
Leo Edwards (verified owner) –
Very happy with my purchase. Communication was excellent, and delivery arrived right on schedule.