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The FG Swirl head has a slight
change to the combustion chamber to
promote swirl and as a result the
volume is reduced slightly to 65cc.
The heads respond to porting in a
similar way to the earlier cylinder
heads and, as you can see, the swirl
inducing port profile is limited to
the inlet only - the exhaust port
profile is the same as the early
heads.
Valve springs are always a problem in
forced induction OHC engines as
comparatively light reciprocating
valvetrain mass usually means a
short, light spring is fitted as
standard equipment. This usually
limits the number of valve spring
options available, however we have 3
different springs available to suit
almost every conceivable application
- please refer to our
valvetrain section.
Forced induction engines also need
good quality valves, especially on
the exhaust due to increased heat.
The OE high nickel exhaust valve
(identifiable by the O forged in the
head) is good for moderate
performance applications and for
extreme duty applications we have
USA made single groove Inconel
stainless valves with flash chromed
stems and hardened tips. The hi
flowing exhaust port also produces
high exhaust gas temperatures,
typically 200-300 degrees F higher
than other turbo engines, which
again highlights the need for an
extreme duty exhaust valve.
O-ringing of combustion chambers is
required when using a copper head
gasket and is part of our GT-R
Series engine packages.
Cylinder
Heads - Outright
#306190 - Stage 3 head suit Ford
DOHC 6 cyl BA Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals.
#306191 - Stage 3 head suit Ford
DOHC 6 cyl BF Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals.
#306192 - Stage 3 head suit Ford
DOHC 6 cyl FG Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals.
#306193 - Stage 4 head suit Ford
DOHC 6 cyl BA Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic Inconel stainless valves,
chrome moly valve locks, Atomic
#306801 springs and new seals.
#306194 - Stage 4 head suit Ford
DOHC 6 cyl BF Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals.
#306195 - Stage 4 head suit Ford
DOHC 6 cyl FG Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic Inconel stainless valves,
chrome moly valve locks, Atomic
#306801 springs and new seals.
Cylinder
Heads - Exchange
#306190-RB Stage 3 head suit Ford
DOHC 6 cyl BA Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals. Customers own head.
#306191-RB Stage 3 head suit Ford
DOHC 6 cyl BF Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals. Customers own head.
#306192-RB Stage 3 head suit Ford
DOHC 6 cyl FG Series
Stage 3 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals. Customers own head.
#306193-RB Stage 4 head suit Ford
DOHC 6 cyl BA Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic Inconel stainless valves,
chrome moly valve locks, Atomic
#306801 springs and new seals.
Customers own head.
#306194-RB Stage 4 head suit Ford
DOHC 6 cyl BF Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic #306800 springs and new
seals. Customers own head.
#306195-RB Stage 4 head suit Ford
DOHC 6 cyl FG Series
Stage 4 Porting, fully serviced,
multi angle valve job, fitted with
Atomic Inconel stainless valves,
chrome moly valve locks, Atomic
#306801 springs and new seals. |
