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Heads
  Heads:
The cylinder heads are of the aluminum Trick Flow Specialties (TFS) High-Port
variety and have been significantly modified by Charles Rogers at Heads
Up Performance. The heads have been modified in very specific
ways because of the previous rules in Street Bandit (formerly Street
Stock). The rules included a requirement for flat-top pistons and
a maximum valve lift of 0.600" lift. In general, we would
prefer not to give hard numbers regarding the heads for two
reasons: 1) Charles has been a key element to our performance
level and we would prefer that he be the one to give specific
numbers. 2) Because of the specific (rules-based) combination the heads were
targeted for, some of the performance numbers may not make sense without
an explanation from Charles directly. For more information on
building high performance engines, check out the books
available at the SlowGT store.
  Ports:
The cylinder head ports have been extensively modified to increase both
intake and exhaust air flow while maintaining minimum port volumes for
maximum port velocity. Heads Up Performance
has been able to greatly increase
port flow numbers with very moderate increases in port volume. All
modifications were made based on the class rules
requirements. In addition, great attention has been paid to
achieving a proper balance between intake flow numbers and exhaust flow
numbers.
[ Top of Page ]
 Combustion
chambers: Combustion chambers in general are a balance between
several competing factors including maximum flow numbers (in the
required lift range), charge swirl and compression ratio. As an
example, air flow can be significantly increased by
reducing the valve shrouding (or material surrounding the valve head) in
the combustion chambers. However, this typically increases combustion chamber
volume which reduces the compression ratio. As a result, the the combustion chambers on SlowGT have
been extensively massaged at Heads Up Performance.
[ Top of Page ]
General: Below is general head-related
information.
The heads are retained using ARP head studs.
The lower studs are tightened to 70 ft-lbs and the upper studs are
tightened to 80 ft-lbs. The studs are tightened incrementally,
which means that all of the studs are tightened (in proper order) to 30 ft-lbs, then
all are tightened to 60 ft-lbs, then all are tightened to 70 ft-lbs,
then the upper studs are tightened to 80 ft-lbs. After all
studs are properly tightened, each stud is individually loosened 1/2
turn and then retightened to the proper torque value. All torque
values are with ARP Moly lube. -
The bolt tightening pattern is as shown in the
figure below.
-
Pipe sealant with Teflon (PST) is applied to the
lower row of head studs to prevent leaks from the water jacket.
-
The head gaskets are Fel-Pro model number
1011-2.
[ Parent Page ] [ Induction ] [ Short Block 2000 ] [ Exhaust ] [ Heads ] [ ValveTrain ]
[ Top of Page ]
 For more detailed
engine-building information, check out the analyses
and books
available at the SlowGT store.
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Last Updated: May 22, 2001
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