at AFD,we set out to reproduce 2 modern versions of
the factory Ford 4V cylinder heads to bring the awesome
power potential of the iron 4v cylinder head down
to a more usable rpm level whilst increasing throttle
response and low to mid range torque by achieving
big efficiency levels,an enormous amount of time and
effort went into developing wet flow velocity of our
Small Port range of cylinder heads to work on a variety
of engine sizes with various bore sizes that are available
in todays engine configarations.Here at AFD we pride
ourselves on the development efforts that result in
the most cfm per cc of port available on the market
The velocity at low lift produces a dramatically improved
throttle response with less camshaft overlap resulting
in a smoother cleaner idol without dropping manifold
SP4VS cylinder head is a street application version
that is suitable for 351 to 400 cubic inch engines.It
certainly has the ability to produce not only great
horsepower but an awesome broad torque curve right
out of the box.By far the best of it's kind from any
cleveland head manufacturers.
click here to see
AFD has a huge range of custom camshaft designs to
maximise the performance levels of your engine.
To discuss a custom camshaft ........click
same super efficient chamber and D-port exhaust runner
design are applied in both our 2V and SP4V series
of cylinder heads which allows for the use of high
compression / low octane fuel combinations ,this is
a result of our super burn high efficiency chamber
design ,you can (without issue) retain your existing
exhaust system aswell, as both the 2v and SP4V series
exhaust runners have been raised only 2mm(.080")
from it's original factory location.
SP4V series comes standard machined to accept a 7/16"
unc screw in stud and guide plate type rocker system,raised
rocker cover rails,hardened valve seats.AFD developed
higher performance 4 angle valve seat design (Serdi
100) and valve guides honed (Sunnen) for max guide
only use the trusted valve guides and valve seats
of C.H.E Precision (USA).supplier to Nascar.and all
forms of Level 1 Motorsport.
Complete packages are available for street use or
competition use.AFD uses only the trusted brands when
choosing valvetrain components to go into our complete
packages whether for the street or full roller race
No other cleveland cylinder head manufacturers can
lay claim to having an exhaust port that performs
anywere near our new D design.
By keeping the exhaust runner in that all important
factory type location for the piece of mind of knowing
your expensive exsisting exhaust systems don't need
to be chopped up or bent out of shape to clear were
it should already fit.
For technical specs click