BMW M88/3 3.5-liter inline-Six Engine

Rated 4.58 out of 5 based on 31 customer ratings
(31 customer reviews)

$11,200.00

Listing Details

  • BMW M88/3 Engine Parts
  • Reassembled Long Block
  • Iron Block w/Aluminum Cylinder Head
  • Black Valve Cover
  • Spare Components
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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. BMW M88/3 3.5-liter inline-Six Engine

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.

31 reviews for BMW M88/3 3.5-liter inline-Six Engine

  1. Rated 4 out of 5

    Guillaume Delorme (verified owner) –

    Mon garage a installé le moteur en une journée seulement grâce à la parfaite compatibilité des pièces.

  2. Rated 4 out of 5

    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.

  3. Rated 4 out of 5

    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.

  4. Rated 5 out of 5

    Rebecca Turner (verified owner) –

    Excellent communication throughout the entire process. Every question I asked was answered quickly, and shipping updates were provided until delivery.

  5. Rated 5 out of 5

    Pascal Boucher (verified owner) –

    La boîte de vitesses fonctionne parfaitement depuis son installation. Aucun problème après plusieurs centaines de kilomètres.

  6. Rated 4 out of 5

    William Carter (verified owner) –

    The replacement engine started immediately after installation. Performance has been excellent with no leaks, unusual noises, or warning lights.

  7. Rated 4 out of 5

    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.

  8. Rated 5 out of 5

    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.

  9. Rated 5 out of 5

    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.

  10. Rated 5 out of 5

    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.

  11. Rated 5 out of 5

    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.

  12. Rated 4 out of 5

    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.

  13. Rated 5 out of 5

    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.

  14. Rated 5 out of 5

    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.

  15. Rated 4 out of 5

    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.

  16. Rated 4 out of 5

    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.

  17. Rated 5 out of 5

    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.

  18. Rated 4 out of 5

    Nicolas Aubry (verified owner) –

    Le moteur tourne parfaitement depuis plusieurs semaines. Aucune fuite, aucun bruit anormal et une consommation tout à fait normale.

  19. Rated 4 out of 5

    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.

  20. Rated 5 out of 5

    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.

  21. Rated 5 out of 5

    Emilio Serrano (verified owner) –

    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.

  22. Rated 5 out of 5

    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.

  23. Rated 5 out of 5

    Romain Vincent (verified owner) –

    Mon garagiste m’a confirmé que toutes les pièces correspondaient aux spécifications d’origine. Cela a considérablement facilité le montage.

  24. Rated 5 out of 5

    Kayla Simmons (verified owner) –

    I appreciated the detailed product descriptions and clear photos. Everything I received matched exactly what was advertised on the website.

  25. Rated 5 out of 5

    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.

  26. Rated 4 out of 5

    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.

  27. Rated 5 out of 5

    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.

  28. Rated 5 out of 5

    Peter Dawson (verified owner) –

    This has become my preferred supplier for BMW parts. Reliable service, quality products, competitive pricing, and professional communication make every purchase a smooth experience.

  29. Rated 5 out of 5

    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.

  30. Rated 4 out of 5

    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.

  31. Rated 4 out of 5

    Leo Edwards (verified owner) –

    Very happy with my purchase. Communication was excellent, and delivery arrived right on schedule.

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