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Buy with confidence!
If for any reason
you're not
completely satisfied
with an item, simply
return it within 7
days and the
purchase price will
be refunded.
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We ship world wide.
All international
orders must be paid
online. Checks or
money orders drawn
on non-US banks will
not be accepted.
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Small Block Ignition System
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Small-block Ford ignition systems are straightforward and easy to understand. The 221/260/289-2V
and 4V engines all used the same basic single-point distributor from 1962-67, differing only in
spark curve, which depended upon vehicle application. Significant changes came in 1968 with the
advent of dual-diaphragm distributors that both advanced and retarded the spark, depending upon
engine load and driving conditions.
The single diaphragm distributor is designed to advance the spark as intake manifold vacuum
increases (under a load with an open throttle). The dual diaphragm distributor works both ways—
advancing the spark during throttle-open conditions, and retarding the spark when the throttle is
closed during deceleration when emissions are normally higher. Retarding the spark reduces
emissions when the throttle is closed. In addition to the vacuum advance, single-point distributors
were equipped with a centrifugal advance designed to give the engine adequate spark advance at
cruise power.
The 289 High Performance dual-point distributor was not equipped with a vacuum advance unit of
any kind. Spark advance for the Hi-Po distributor comes from the centrifugal mechanical advance
inside. Because a 289 High Performance engine does its best work at high revs, the centrifugal
advance is designed to advance the spark at a rate corresponding to rpm range. Ideally, a Hi-Po
engine will experience a total of 36 degrees of advance at 5000-6000rpm, with 12 degrees at idle.
This is a target to aim for with any ignition system. Anytime you push total spark advance beyond
36 degrees, you risk engine damage.
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A weak spot in Ford distributors is the shaft bushings. Bushing wear is immediate and swift because
lubrication and shaft support are poor. Nonetheless, rebuilding a vintage Ford distributor is easy
and requires very few replacement parts. Arm yourself with a set of bushings (B8HQ-12120-A, top,
and C5AZ-12132-A, bottom) and advance springs designed for your application. Apply liberal
doses of assembly lube on the bushings and shaft during reassembly. Replace the vacuum
advance only as necessary.
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Ford Upgrades
If you’re a die-hard for genuine Ford parts, upgrading to a stock Dura-Spark ignition is likely the
answer for you. Older 221/260/289/302 engines live happily with the Dura-Spark upgrade because
it is exactly the same size as the original Autolite 12100 distributor fitted prior to 1975. Aside from
the proper positioning of the Dura-Spark ignition module, installation is easy.
Distributor Identification
To follow is complete information gleaned from the Ford Master Parts Catalog on Ford small-block
distributor identification. We have cleaned up this information for your convenience. There are
literally dozens of original applications that were rooted in emission and performance requirements
and vehicle type.
Truth is, all Autolite and Motorcraft distributors were identical in construction. Where they differed
was in the area of spark advance/retard. Each identification and part number was based on
distributor calibration only.
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Calibration isn’t as complicated as it sounds. Calibration was based on rate of spark
advance/retard. You can take any Autolite or Motorcraft distributor and calibrate it to your
application, unless you’re looking for a specific identification number for a concours restoration.
You simply need to know which centrifugal advance springs and weights to use. Plus you must
understand how to adjust in rate of vacuum advance. This means getting the spark advance in
synch with engine rpm and throttle pressure/position.
Another point to remember is both Thermactor and IMCO emissions packages. Thermactor is the
smog pump system. IMCO (short for “Improved Combustion”) is a combination of spark control and
fuel mixture. Thermactor and IMCO are not the same thing.
One other item to keep in mind is the Motorcraft part number, which is shown in parenthesis where
applicable with each Ford part number in the chart.
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The humble Ford
single-point distributor
didn't change much
throughout its production
life. Aside from the use of a
dual-diaphragm vacuum
advance/retard beginning
in 1968 on most engines,
this single-point design
remained the same until
1975 when Dura-Spark
electronic ignition replaced
all point-triggered units.
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The Autolite dual-point distributor
used only on the 289 High
Performance engine isn't much
different than the single-point unit,
except for the absence of a
vacuum advance.
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Autolite distributors through 1964 had oil wicks like
this one. This is a 289 High Performance dual-point
unit.
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This is a 1969-70 vintage Autolite dual-point distributor for the Boss 302 engine. Note the
dual-advance unit.
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Previous | Next
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This has been a sample page from
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High Performance Ford Engine
Parts Interchange
by George Reid
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First-ever book about Ford parts interchange
Covers the entire range of Ford engines from
221-CID to 460-CID
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This is one of the best books ever written about Ford engines.
Covering both big- and small-block Ford V-8 engines, this
first-ever book on the subject provides indispensable information
to the Ford enthusiast. Included are high performance factory
parts, interchangeability between Ford Windsor and Cleveland
engines, extensive coverage of the 302 and 351 series as well as
the 352, 390, 406, 427, 428, 429, and 460 big block engines,
factory casting numbers, etc. Read the sample pages from each
chapter to learn more!
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Click below to view sample
pages from each chapter
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"If you are trying to mix and match cranks and rods, this book
will tell you if it can be done. If you are trying to find the correct
casting number for a Boss 429 distributor, this book will have it
listed. What we really find appealing about the book is that, not
only is it a perfect resource for those interested in factory
correct restorations, but it is equally as useful for the
performance oriented engine builder. Each chapter points out
building tips, such as how to improve a Cleveland's oiling
system, or what heads will yield the best horsepower gains. As
with all SA Design books, this one is filled with pages of detailed
photographs and diagrams. This book will prove to be a
priceless resource, as many of the original Ford V-8 parts
become harder and harder to come by." -- FORDMUSCLE
webmagazine, February, 2000
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Small Block Fords
Chap. 1 - Small Block Ford
Chap. 2 - Cylinder Block
Chap. 3 - Crankshaft & Rods
Chap. 4 - Oiling System
Chap. 5 - Cylinder Heads
Chap. 6 - Intake System
Chap. 7 - Ignition System
Chap. 8 - Exhaust Manifolds
Chap. 9 - Cooling System
Big Block Fords
Chap. 10 - Big Blocks
Chap. 11- Cylinder Block
Chap. 12 - Crankshaft & Rods
Chap. 13 - Oiling System
Chap. 14 - Cylinder Head
Chap. 15 - Intake System
Chap. 16 - Ignition System
Chap. 17 - Exhaust Manifolds
Chap. 18 - Cooling System
All Ford Engines
Chap. 19 - Gaskets
Chap. 20 - Engine Math
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Softbound
8-3/8 X 10-7/8
128 pages
Over 300 b/w photos
Item # SA56
Price: $18.95
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Click here to buy now!
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This is a great book that any Ford engine enthusiast or
engine builder is sure to love!
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Other items you might be interested in
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How to Rebuild the Small-Block Ford
In this 144 page book you're walked step by step through a rebuild,
including: Planning your Rebuild; Disassembly and Inspection;
Choosing the Right Parts; Machine Work; Assembling your Engine;
and First Firing and Break-In. Includes 289, 302, 351W, 351C, 351M
and 400.
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Price:
$18.95
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The Step by Step Guide to Engine Blueprinting
Practical methods for racing and rebuilding, selecting and preparing
parts, and how to buy machine shop work. This completely revised and
updated version containing an additional 32 pages is simply the best
book you can buy on engine preparation for street or racing! Engine
Blueprinting shows the reader how to use precision measuring tools,
calculate compression ratios, degree a camshaft, and much more!
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Price:
$18.95
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How to Build Big-Inch Ford Small Blocks
Thoroughly explains how to build a stroker, with information that will
help you to better tailor your heads, cam, intake manifold, carburetor &
exhaust system to get the most of the extra cubes. Also included is a
complete guide to head and block castings so you can choose exactly
the right parts for your project.
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Price:
$18.95
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How to Build Max Performance Ford V-8 on a Budget
This book addresses high-performance V-8 engines such as the 289,
302, 351ci small-blocks found in Mustangs, as well as the FE series of
big-blocks. Includes realistic, low-cost formulas for building serious
horsepower in Ford V-8 engines.
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Price:
$18.95
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Shipping is combined and discounted for multiple item purchases!
Buy more and save on shipping!
We ship Worldwide! See International Shipping for more information!
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Search Our Store for More Great Ford, Lincoln & Mercury Items!
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FAST AND EFFICIENT SERVICE
We believe customer service and online retail can coexist. Our policy is to treat customers the way
we would like to be to treated. We strive to describe all items correctly. You have many options
online, but we believe our service is the best. We work around the clock to fill orders and ship items
within one business day. It is our goal to serve the customer before, during and after the checkout
process. Why gamble with your money and purchase from other sellers? We look forward to doing
business with you now and in the future.
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FAST SHIPPING
Items usually ship within one business day of receipt of payment! We keep large quantities on hand
and have a state of the art inventory management system to ensure your items are in stock and
ready to ship.
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YES, WE HAVE A RETURN POLICY
Satisfaction is guaranteed. Our store has a NO HASSLE RETURN POLICY within 7 days of
purchase. Your exchange will be processed upon receipt. If you are not satisfied with your
purchase, our knowledgeable team will do their best to make sure you get what you are looking for.
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QUALITY AND AFFORDABILITY
Why pay retail when you can save money and benefit from our purchasing power? We stock large
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SHIPPING
Standard shipping is a flat rate of $4.95 to anywhere in the United States with USPS Media Mail.
Priority Mail shipping is available for an additional $3.00, or $7.95 shipping. Shipping is combined
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for each additional item.
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Europe, Australia, Asia, Japan and South America for $14.95. Shipping is combined and discounted
for multiple items purchases as follows: first item regular price shipping, add $1.95 for each
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PAYMENT & SALES TAX
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If you have any questions or comments please feel free to contact us. We look forward to serving
you and fulfilling your needs.
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Thanks for your business!
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MRE
PO Box 47
Grinnell, IA 50112
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