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Modifying Small Block Ford Cylinder Heads
Modifying Small
Block Ford Cylinder
Heads

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Small Block Exhaust Manifolds and Headers
The exhaust system is one of the more primary performance tools available to the enthusiast.
Because performance enthusiasts aren’t looking for single exhaust systems, we will examine factory
and aftermarket dual exhaust systems beginning at the manifolds.

Dual exhaust systems didn’t come into play for small-block Fords until the Mustang was introduced
in April of 1964. Contrary to popular assumption, Fairlanes, Falcons and Comets equipped with the
221/260/289 engines were not factory equipped with a dual exhaust system. Even the 289 High
Performance engine in the 1963-64 Fairlane was fitted with a single exhaust system.
Manifolds
There are very few different exhaust manifold types for small-block Fords, especially in the
performance arena. The 289 High Performance exhaust manifold offers improved breathing over
2V and 4V manifolds, but it is not a true cast iron factory header as found on the 390/406/427ci
High Performance big-blocks. The 289 High Performance exhaust manifold isn’t much different than
the 351W manifold to come later in 1969. Both types offer longer runners, which is less restrictive
than 2V and 4V types.

The Boss 302 exhaust manifold isn’t much different than a 351C exhaust manifold. Limited
clearance in a Mustang/Cougar didn’t permit the installation of a factory cast iron header on the
Boss 302. The aftermarket offers limited options for the Boss 302 enthusiast. Only long-tube
headers are available from manufacturers who offer headers for this engine. The same tends to be
true for 351C/351M/400M engines as well.
Ford 289 302 Exhaust Manifold Ford Exhaust Manifold Casting Number
The 289/302-2V and 4V exhaust manifold. Although casting and part numbers changed a bit
throughout the life of these castings, the basics did not. Unless you're concerned about date-coded
originality, these manifolds went unchanged from 1962 through the early 1970s. This is a 1966
vintage exhaust manifold, C6OE-9430-D, with a casting date code of "6A27".
Thermactor Emissions
Beginning in 1966, Ford began fitting California-bound vehicles with an air injection system called
Thermactor. Thermactor is an exhaust emissions control system which includes an air pump, hoses
and air manifolds tied to Thermactor-specific cylinder heads. The air pump injects air into the
exhaust ports to aid in further combustion of unburned hydrocarbon emissions. Thermactor doesn’t
rob power, as most perceive it does, because the air pump doesn’t place any significant drag on
the engine. From 1966-74, Thermactor-equipped Ford small-blocks utilized an air manifold on each
cylinder bank. Beginning in 1975, Thermactor became an internal part of each cylinder head, with
ports at each end of the head for one common manifold located at the back of the engine.
Ford 289 HiPo Exhaust Manifold 351W Exhaust Manifolds
The 289 High Performance exhaust
manifold is obviously different and
offers improved breathing. Here, we
compare them with standard 289
manifolds (B and D) These manifolds
are C3OE-9431-B (Left Side/Arrow C)
and C4ZE-9430-A (Right Side/Arrow A)
from 1963-66. For 1967, they are
C7ZE-9431-A (Left Side) and
C7ZE-9430-A (Right Side). The 289
High Performance exhaust manifolds
are available as reproductions from
Ford parts vendors.
The 351W exhaust manifold is similar to the 289
High Performance pieces just mentioned. It offers
improved breathing over the 289/302-2V and 4V
manifolds without excessive header heat and
clearance problems. As you can see, 351W
manifolds vary from left to right. There is a
right-hand 351W exhaust manifold similar to the
manifold on the left.
Small Block Ford Shorty Header Small Block Ford Shorty Header
Equal Length Small Block Ford Shorty Header
Shorty headers, available from a
variety of header manufacturers,
provide improved breathing with
the benefit of being a bolt-on
replacement. These are a good
alternative to long-tube headers.
Equal-length shorty headers offer
improved breathing, but difficulty
accessing spark plugs.
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This has been a sample page from

High Performance Ford Engine Parts Interchange High Performance Ford Engine
Parts Interchange
by George Reid
First-ever book about Ford parts interchange
Covers
the entire range of Ford engines from
221-CID to 460-CID
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!
Click below to view sample
pages from each chapter
"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

In Stock and Ready to Ship!

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  
Softbound
8-3/8 X 10-7/8
160 Pages
417 Color Photos
Item # SA56
Price: $22.95
Click here to buy now!
This is a great book that any Ford engine enthusiast or
engine builder is sure to love!


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