Dart proudly announces the next evolution of

Dart proudly announces the next evolution of aluminum block design
for the LS Next and the Small Block Chevrolet "SBC" by introducing
the technology of the
aluminum blocks.
MID wet sleeve design in select Dart
Current Technology
New Technology
Conventional aluminum blocks with pressed in sleeves do not
provide the optimal strength and rigidity expected by today's racers
and which are demanded by high performance engine builders to
perform on a prolonged basis.
The Darton Sleeves MID technology effectively redesigns the engine
power section by incorporating changes in block casting features to
anchor the head stud bosses well below the water jacket deep in the
core and then nesting the sleeve in vertical compression on a
machined surface in the block core mass. The net result of this type
of design and sleeve installation is to provide for significant increase
in block integrity as anchoring the sleeve bank in compression to the
core mass removes block distortion and harmonics created by the
power action. The longevity and net power increase come as a result
better of combustion chamber cooling, virtual elimination of bore
distortion through increased cylinder mass and sleeve design and
directed siamese water circulation. The sleeve bank is unaffected by
temperature differential as it is wet and the cooling media is in direct
contact with each sleeve.
Sleeves which are pressed into thin wall registers and seat on a
narrow counter bore ledge in the deck along with head studs which
anchor in the deck are not stable when the engine is operating at
high RPM with high cylinder pressures. This is evidenced by high
leak downs; cracking in the upper and lower sleeve registers and
bore distortion. Part of this block distortion is inherent in the design;
at high operating horsepower and cylinder pressures the head studs
actually start to stretch the block vertically away from the crank
web; the aluminum material grows away from the sleeve as
differential coefficients of expansion take place at operating
temperatures and the cycle of distortion leads to block cracking over
a period of time.
The following points are a list of benefits and features of the MID
sleeve technology:
• Eliminates block cracking due to cylinder
failure
• Wet sleeve (diesel design) for in-field
replacement
• Virtually eliminates cylinder distortion
due to block flexing and harmonics
• Significant cylinder integrity and strength
improvement over dry sleeves
• Superior cylinder sealing with diminished
or no pan pressure
• Increased bore size potential at current
bore spacing of 4.4 inches
• Superior cooling, especially at upper
chamber quench area
• Ducted water flow for all applications in
either direction
• Engineered Siamese water cross flow
eliminating hot spots
• Design removes deck distortion by
seating and anchoring sleeves in
compression in the lower block area
where the maximum aluminum mass is
concentrated
• Increased thermal stability of the power
section at all operating temperatures
• Compatible with all currently available
head designs
• Will support boost up to 50 PSI without
distortion
• Absolute minimal weight increase over
stock aluminum block configuration
Dart Machinery
353 Oliver Street
Troy, MI 48084
Phone: 248-362-1188
Fax: 248-362-2027
www.dartheads.com