FBO Ignition Systems 

Your Source for American Made Performance and Muscle Car Ignition Parts

Need to talk to a Tech Guy with 50 years experience and not last weeks Employee of the Week at Burger King? 

541-942-5920 Call or Text


Mopar Distributor Limiter Plates

No More Welding and Filing!

This FBO Advance limiter plate will allow you to have the limiting abilities of a TRUE Mopar Performance Distributor in minutes.

Quick easy and changeable as you build your engines performance level.

One Masterfully Engineered Part gives you 0-10-12-14-16-18* of Mechanical Timing limits, changeable at any time.

Click for full size images


We all are aware that in order to run a performance engine especially with today's fuel formulations we need to have more initial timing in the motor but we still need to control the total timing which on most Mopar Engines is 34* or they will detonate.

Note: Max Compression Ratios on pump gas with Iron heads is 9.5:1, aluminum heads 10.5:1, 1 point of compression will add 2-5HP but if you have to retard your total timing by 1* it could take out 5-20HP unless you running very high RPM's there is little to no gains achieved by building a motor with too much compression for pump gas, race gas is whole different set of rules.

In the past the you stripped down the distributor to remove the T-Bar and then guessed how much to weld up the slots to shortened the total mechanical advance limit or the amount of travel the weights have, which is the mechanical timing limit.

Once you had it all welded and filed smooth then you reassembled, ran the engine and checked the amount of total mechanical timing, then you took it all apart again and filed or welded more by guess and by golly and tried it again.... repeat several times to finally get it close and hope you have the slots both the same length.

No more! Whatever the amount of mechanical timing you need, drop in the plate and your done!

The laser etched numbers on the disc designate the amount of mechanical advance so for instance...

If you want 18 degrees of initial timing you just set the plate on the 16* slot 18 initial+16 Mechanical= 34* total

If you want 24 degrees of initial timing you set the plate on the 10* slot for 24 +10= 34* total

If you want to lock down the distributor with NO Mechanical timing at all then just drop the plate over the 0 round hole.

Now you can have all the adjustability of a Mopar Performance distributor for a fraction of the cost. Simple installation with NO welding and filing and dead on perfect timing accuracy.

Click Images for full size

Shows the J685 over the 12* Holes (22* Initial)

FBO-J685S Limiter discs are MADE IN USA from 100% American Stainless Steel and carry a

LIFETIME Warranty on Workmanship and Material... yours or ours whichever is shortest.



Now Lets Finish This Project!


Now you've got 1/2 the job done, you've taken the time and invested in an excellent product to give your ignition a chance to operate correctly, but your only 1/2 way there. 

Now you need to address your old antiquated transistor type ECU which is working hard to take away everything you just did.  Those old style Transistor ECU's start retarding the timing at about 3200 and by 5200 most have pulled 8-10* of timing out of the motor!  How can it possibly perform correctly when it's retarding the timing so drastically?

Retarding the timing will take out 5-20 HP out of the motor for every degree, depending on the performance level of your engine.

The reliability of a Made In China Transistorized Orange, blue, green, pink, black whatever color ECU combined with the quality of the old ballast resistor makes your ignition a crap shoot, better carry spares, your going to need them.


Rich stinky Idle? Carb won't respond to your adjustment? Stumbles?

Poor Mileage?


It's all in the timing events, get it fixed before you damage your engine!


Need a new distributor?


The HRR688 fully computerized ECU with the matching Pertronix coil bypasses that unreliable ballast resistor (5.5V) and feeds your ignition system at battery voltage, 12-15V...

 More Power In = More Power Out

  • Will Not retard the timing to 7000 RPM

  • 10 position REV Limiter 5200-7000 (200R steps)

  • Algorithm DEAD Stop REV Limiter

  • Plug and Play, stock mounting pattern

  • Billet housing

  • EPROM Microprocessor controlled



How can we offer a 5 year Warranty?

It's a simple formula, design it using the best engineering and components, use ISO 9000 certified suppliers to guarantee consistency in manufacturing. Do your research and apply your nearly 50 years of experience, do 6 years of R&D and testing so that it's right from the 1st piece made to the latest piece.

Beware the Marketing Department: "New design, New for 2018, New Improved features." These statements are only telling you that there were problems in their original release. Check their warranty!

Beware of ridiculous claims of massive HP gains over MSD I could write a book on why that statement doesn't make any sense.  Wait, I did write a book!

Compare our Warranty/Quality to any other Manufacturer!

To Shop On Line simply mail a request for a PayPal invoice for the part number during business hours, usually just takes a few minutes.





J685 Limiter Disc Only

6 Position

J685S Instructions on line Click Here




Free Shipping in USA

Canada, Australia and most of Europe Add $5.00

J685S Disc with 6 piece Spring Kit

J685S Instructions on line Click Here


Free Shipping in USA

Canada, Australia and most of Europe Add $5.00




J685SK Full Kit- Disc, Spring kit and

 Tuning Guide

J685S Instructions on line Click Here




Free Shipping to all of USA

Canada, Australia and most of Europe add $10.00

Limiter Disc, Spring kit, HRR688 Ignition module, Ballast Jumper Kit, PerTronix 40011 Super Hot Coil, Tuning to Win.

Limiter Plate full instructions on line.

J685S Instructions on line Click Here

DIY Performance Stock Type Tune up kit

Tune your stock type distributor -Update your Ignition system-Add a REV Limiter

Set up your own curve and save nearly $100.00


Tune-Up Kit $275.00

Free Shipping in USA

More kits are listed here

Canada Add $20.00

Australia and most of Europe Add $30.00


Dear Spectra:

There are no longer any Cast Mopar distributors available that meet our high quality standards.

Everything is now made in China/Taiwan and to a quality level that is unacceptable to our rigid standards.

Spectra has bought the last facility that was making a decent Mopar Distributor and overnight changed the design and quality to such a low standard that even we can't fix them or give them any type of decent warranty and if we can't give you a multi year warranty then we won't sell them.

We Refuse to Sell Junk!

We will not sacrifice OUR reputation for quality just to take make them money!

Quality was lowered by 80%, but the price went up?


New Billet Mopar Distributors

Tune Up & Upgrade Kit

Do It Yourself

New Billet Distributor with vacuum and mechanical advance , Spring kit, HRR688 Ignition module, Ballast Jumper Kit, PerTronix 40011 12V Coil, Tuning to Win hard copy.

Perfect For the DIY Guys

Everything you need to achieve the ultimate tune-up!

All common Mopar engines available 273/318/340/383/400/361/413/426 wedge/440

More kits are listed here


We're always here if you need any technical help

Give it a try, We know you can do this!


All One low price for all Mopar Wedge Engines


Add Tan Cap and HD Rotor  Included

All as cast OE type distributors have been discontinued   The company was bought out by a Chinese Manufacturer and the all quality was removed for Profit considerations, Price increased but quality is so low now even we can't make them work.. New Brand Name is "Spectra", beware!

We have replaced them with a high quality Billet Distributor



Ignition Upgrade & Tuning kit

Limiter Plate, Spring Kit, HRR688 ECU w/ REV Limiter, Coil and Ballast Jumper

All for $255.00

Limiter Plate Now included!



HRR688 Warranty

5 Years!

Pertronix Coil - 30 Months

J685 Disc - Lifetime





Got MSD?

Advance limiter bushings for most MSD Pro Billet and regular Pro-Billet distributors.

Each kit consists of a  CNC machined 10* and 14* limiter bushing.

10* has CNC Milled sides to fit in the variable dimensions of the MSD slot

Click here for more details

OR Shop on EBay Item #


eBay listings are higher to cover excessive fees levied by eBay and PayPal (about 14% right off the top)


MSD Limiter Bushing 10/14* Kit

In stock $35.00

Free Shipping to all USA addresses

Canada, Australia, Most of Europe Add $5.00

Tired of MSD box failures, rusty distributors,  inconsistency of your R2R unit??

Look here there is an AMERICAN Made alternative

Always In Stock!

Contact your nearest location for Price and Availability

All Prices referenced are to USA customers

Prices may change without notice


Pennsylvania B3 Racing Engines-Contact Mike at b3racingengines.com


Washington the State-Contact Ken at ken68dart@comcast.net

Sweden- ola.berglund@tano.nu





Your Source for American Made Performance and Muscle Car Parts

541-942-5920 Call or Text

Monday-Thursday 8am - 3pm Pacific Time