Autoblog and Yahoo may earn commission from links in this article.This 1979 Porsche 930 Turbo is a builder's take on the slant-nose look, with steel Flachbau bodywork and a seriously reworked engine rather than a factory conversion. The flat-six runs RUF pistons, twin-plug heads, and modern engine management, and it drives through a four-speed with a limited-slip diff. It is a modified, honest driver rather than a preserved original, and that framing is exactly how a buyer should approach both the car and its value.1979 Porsche 930 Turbo Slant NoseBring a TrailerWhat it's worth right nowBecause this is a non-factory conversion, it lives in Classic.com's 930 Custom market rather than with original cars. Classic.com shows a comp range of roughly $79,000 to $155,126 for 1979 slant-nose conversions, with one comparable car selling for $104,930 on Bring a Trailer. That is the relevant band here, and it sits far below genuine factory slant-nose cars.AdvertisementAdvertisementThe gap to factory is the key context. A real M505 factory slant-nose coupe benchmarks around $217,906 on Classic.com, and even a factory conversion is a different, far more valuable object than an aftermarket one. As a listing commenter noted, a legitimate factory conversion would be a gold-mine find, whereas an aftermarket steel conversion trades on how well the work was done and how it drives.1979 Porsche 930 Turbo Slant NoseBring a TrailerWeighing the built engine and recent mechanical sorting against the disclosed flaws and non-factory status, I would call fair value roughly $70,000 to $95,000. The current $25,000 bid with six days left is early, and where it lands will depend on how bidders weigh the strong drivetrain against the cosmetic and leak items below.Condition and detailsThe mechanical story is the appeal. The replacement flat-six was rebuilt in 2004 with RUF 3.4-liter pistons and cylinders, 3.6-liter cams, twin-plug heads, Haltech programmable EFI, custom headers, and a custom intercooler, and the replacement four-speed was rebuilt at the same time with a limited-slip differential and a new clutch. More recent work includes a 2020 fuel pump and billet blow-off valve, and 2026 attention covering an oil change, an alternator belt, and an oil-tank hose, plus a pre-sale brake-fluid flush with four new brake hoses. The seller's driving video drew positive comments, which matters on a modified car.1979 Porsche 930 Turbo Slant NoseBring a TrailerThe flaws are disclosed, which is the right way to sell a driver. The seller notes leaks at the turbocharger and valve covers and sagging engine mounts, all of which are worth budgeting for on a car of this age and output. Inside, there is a tear in the driver's seat, damaged rear speaker grilles, a non-working alarm, and a torn headliner around the sunroof, though the door seals were replaced and the handles re-keyed in 2026.1979 Porsche 930 Turbo Slant NoseBring a TrailerTwo verification items stand out. The odometer is a six-digit unit that was repaired in 2013 and shows 40,000 miles, so treat that as shown rather than confirmed. And the seller notes the engine and transmission appear to have been replaced since the Porsche Certificate of Authenticity was issued, with the CoA and the current engine and transmission serial numbers provided in the gallery, so confirm the drivetrain identification as part of due diligence.1979 Porsche 930 Turbo Slant NoseBring a TrailerAdvertisementAdvertisementThe offerSpecificationDetailMakePorscheModel930 Turbo (slant-nose conversion)Year1979Mileage40,000 shownEngineTurbocharged 3.4-liter flat-six, twin-plug, Haltech EFIPowerNot stated by sellerTransmissionFour-speed manualDrive typeRear-wheel driveExterior colorBlack MetallicInterior colorBlackCurrent bidUSD $25,000Interested in this car? View the listing here.What makes the 930 Turbo slant nose uniquePorsche created the factory slant-nose, or Flachbau, under option code M505 for customers who wanted their road cars to echo the 935 race cars, and genuine factory examples in coupe, Targa, and cabriolet form are rare and expensive today. The look became iconic enough that a large aftermarket grew up around it, producing steel and fiberglass conversions of standard 930s. This car is one of those aftermarket steel conversions, reportedly using headlight housings sourced from a Mazda, which is why it lives in a very different price tier than a factory car.1979 Porsche 930 Turbo Slant NoseBring a TrailerWhat makes this particular example interesting is the drivetrain rather than the badge. Rather than a stock 3.3-liter, it carries a built flat-six with RUF internals, twin-plug heads, and modern fuel injection, which is the kind of upgrade that appeals to buyers who want to drive the car hard rather than preserve originality. That is the whole proposition here: a modified, quicker, more usable 930 with the dramatic slant-nose silhouette, priced as the driver it is rather than as a collector piece.My takeI like this as an honest, hot-rodded 930 for someone who wants the slant-nose look and a strong-running engine without factory-car money. My fair-value call is $70,000 to $95,000, and I would weigh the quality of the RUF-based engine build and recent brake work against the leaks, sagging mounts, and interior wear that a driver-grade car of this age carries.AdvertisementAdvertisementThe buying advice is about verification and expectations. Confirm the engine and transmission identification against the provided serials and the Certificate of Authenticity, treat the repaired 40,000-mile odometer as shown rather than verified, and budget to address the turbo and valve-cover leaks and the tired mounts. Go in seeing this as a modified driver, not an original collector 930, and the current $25,000 bid is a sensible starting point on a car that should be a lot of fun once sorted.Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.Disclaimer: Autoblog aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission.This story was originally published by Autoblog on Jul 25, 2026, where it first appeared in the Car Buying section. Add Autoblog as a Preferred Source by clicking here.
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