Flywheel bolts for 1300, 1600 & 1750 engines.

These bolts have long been unavailable from Alfa.  That means these bolts have been reused over and over for engine rebuilds, and undoubtedly, they are well past their limits for safe use.  In fact, upon close examination, most show serious wear marks under their heads.  They should be replaced with new, but people have reused them because they had no alternative.
These new bolts are custom made replacements by ARP (Automotive Racing Products), the premiere automotive fastener manufacturer.  Using their proprietary processes, these bolts are forged from special aerospace alloys, then heat treated before thread rolling, and machining.  These high tensile strength bolts are rated at 180,000 psi. 
They are far superior to OEM and they are available.  Washers are chamfered to fit the bolt's underhead taper.

Gear Lightening

Long considered to be the ultimate in gear box preparation for the track.  Lightening the gears removes unnecessary rotating mass from the gear train.  The principal benefits that accrue are quicker shifting and longer synchro life.  Performatek undercuts (where possible - this is not feasible on the smaller gears) and cross drills the gears*.   The biggest "bang for the buck" is to lighten 1st, 2nd & 3rd gears on the mainshaft, and 4th, 5th & Reverse on the layshaft.  These synchros see the most use (especially 2nd and 3rd), and they are on the biggest gears, so they have to deal with the biggest disparity in weight & rotation speed.  Having said that, once the box is open, it is not uncommon to have them all done. 
Performatek can also offer a complete transmission rebuild.  It is difficult to give a complete price schedule for a transmission rebuild because it is hard to predict which pieces will be worn beyond acceptable limits. The labor is fairly constant, but the parts need varies widely.  The only way to know is to give the transmission or at the very least, the gear stack, a thorough inspection by a seasoned professional - either your local Alfa technician or by Performatek.   Typically, one or more dog rings will need to be replaced (this actually is the part that grinds on bad shifts).  Also, expect one or more synchros & sliders to be worn.  Of course, the prudent Alfa owner will also prepare for the surprise "issues" that always seem to crop up in a rebuild like this..
Some of these parts can still be replaced by OEM parts, for some, you may have a choice of either OEM or aftermarket parts.  Some parts are NLA and can only be replaced by scavenging less worn parts from used transmissions.  In order for Performatek to inspect the gears, it is recommended that you send the complete mainshaft with gears attached.  If you prefer, you can send the complete transmission (minus bell housing), case and all.  After inspection, we can quote the parts cost for the rebuild.
GEAR OIL must be drained thoroughly.

*In order to perform the machine work, the gears must have dog rings removed - either by you or by us.

Delivery
Gear lightening 2-4 weeks after receipt of gears.
Transmission rebuild - tbd, but typically 2-3 weeks after receipt.

Clutch Assembly

The Alfa 105/115 clutch assemby can also yield performance gains via lightening.  The stock clutch disk weighs close to 3 pounds and for any engine output up to about 180hp, should be adequate, and is easy to drive on the street.  However, if your engine will be delivering more power than that and/or be primarily a track car, then other clutch options become preferrable and realistic.  We can provide clutch disks with greater friction levels and clamping forces.  Your pressure plate can be modified to give more clamping force if necessary.  Contact us and we can review your needs and options. 
The flywheel can be lightened significantly which will greatly reduce rotating mass to give more immediate throttle response and rob less power from the rear wheels.  For the most gain, the flywheel can be replaced with a very lightweight aluminum or steel flywheel.  
For the replacement flywheel, you will need to specify the ring gear (tooth count) required.

Limited Slip Differential

The limited slip differential is an important contributor to maximizing performance from your Alfa.  In slippery or marginal traction circumstances, it allows some power to be fed to the wheel that is normally unloaded and spinning wildly. Balancing the torque applied to the rear wheels increases the chance that one or both can find traction and keep the car moving.  Of course, this feature becomes increasingly important as engine output increases.  This type of differential relys on friction clutch disks to transfer the torque from one axle to the other.  Over time, these disks wear out and the differential effectively reverts back to an open differential.  The result is big throttle incudced wheel spin in the wet, or in uphill corners, etc.  When this happens, the clutches need to be replaced. 
For those who want more, the differential's performance can be increased to give even better performance. In the standard Alfa Romeo limited slip differential, the limit is set to about 25%, however, by rearranging the disk stack, the slip limits can be almost doubled.  
Performatek can perform either a standard rebuild or a high performance rebuild. We will also inspect the differential carrier bearings, and notify you if one or both need to be replaced.
We have recently received limited slips that were so bad that even the spacer disks had to be replaced.  These rebuilds obviously ended up costing more.  Highly unusual, nevertheless, be prepared for any eventuality when they are opened and inspected.

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