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Noonan
Noonan for Porsche
We design, develop and manufacture engines for the ultimate form of racing. We innovate with new thinking and engineering to create the ultimate Porsche powerplant working together to give our clients their ultimate race on the track.Noonan founded the business armed with an expansive background in drag racing and has formed a team of like-minded technical and business specialists, all with their own unique skills and experience to collaborate with customers and vendors. Our aim is to create a winning partnership whether that results in a world record, a race win or a personal best performance. We keep the racer in mind, striving to ensure customer satisfaction both on and off the track
A Quick Look at Noonan
Noonan information on this page is based on details supplied by the manufacturer or distributor, plus any OE references provided with the parts
Choosing the Right Fit for Your Porsche
Where Noonan is listed for Porsche, use the supplied model coverage and OE references to confirm suitability. Check details that commonly affect fitment such as model year, side/position, and connector type where relevant.
- Typical reasons people choose these parts include rebuilding tired Porsche engines, supporting higher RPM or boost, and improving durability for spirited road or track use.
- Common problems in this area include bearing wear, oil pressure issues, detonation damage, overheating, and inconsistent performance when lubrication, cooling, or tuning are not optimised.
- Plan any build around oiling and heat control, and use data-logging where possible to spot issues early and protect your investment.
- Accurate measurement and machining are critical – always check clearances and cleanliness before final assembly.
Browse by Category
If you already know the area you are working on, start with the category and then filter by Porsche model. Where real-world symptoms and typical reasons to replace are provided, use them to keep the wording grounded.
Engine Rebuild Parts — Engine rebuild components are typically replaced during a planned overhaul or when tests point to internal wear, such as loss of compression, excessive oil use, persistent leaks, abnormal noises, or contamination found during inspection. Many Porsche owners and specialists renew chains, guides, bearings, gaskets, seals, and critical fasteners while the engine is apart to avoid repeat strip-downs and improve reliability after the rebuild.
- Before committing to a rebuild, perform compression and leak-down tests, inspect bores with a scope, and check the oil/filter for debris so you understand the root cause.
- When the engine is out, consider replacing hard-to-reach wear items "while you’re in there" to reduce future labour and downtime.
Crankcase Parts — Crankcase parts support the core of the Porsche engine, and are usually addressed when there has been bearing failure, thread damage, cracking, or leakage from case joints, or when clearances and oil pressure are affected. During major rebuilds, owners often upgrade or renew crankcase components to restore alignment, improve sealing and ventilation, and ensure oil passages are clean and stable for long-term reliability.
- Pay close attention to oil passage cleanliness, bearing bore alignment, and sealing surfaces; pressure testing and careful measurement help catch issues before final assembly.
- Some crankcase issues can be repaired by specialist machining, but more serious cracks or distortion may require replacement or advanced repair techniques.
Explore Noonan at Design911
View the current Noonan range for Porsche at Design911, then filter by model and category to narrow down to the right parts.
This Crankcase is for a 4.0L conversion with 109mm spigot bearings.

Fits:
Porsche 964
Noonan delivers the worlds first all Billet 911 Porsche case, bringing the almost extinct engine back in a more reliable and race ready application.
The Noonan Billet 911 (964) case has been developed utilising the 911 Porsche cast architecture and brings a new levels of strength and rigidity to extend engine life for endurance road racing applications or the die hard Porsche restorer.
After a successful season of on track testing with Renn-Link Racing, USA the engine case is now being released to the marketplace.
The engine showed incredible durability and reliability throughout the season with almost 60 hours on track time utilizing the same bearings. Team Crew Chief – Tim Carey said “the engine has exceeded our expectations beyond belief. We have always had to replace bearings at 25-30 hours and generally scrap the engine case due to fatigue and cracking in the weak zones, the billet case has by far out performed this and we are excited to see how far we can really push it.”
The billet case is manufactured from 6061 Aluminium sourced locally in America.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9641090510
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93