Design Features
Capable of generating 1000+ Horsepower
Designed for 500 to 650 cubic inch engines
Recommended to fit on 4.440 or greater bore; .080
over the standard 429/460 block bore
Most versatile cylinder heads in the business
Engineered to accept A460 valve train and intake hardware
Exhaust Flange configuration is big block Chevy
Available either bare, CNC machined or in a variety of assembled
configurations
Can be special ordered without water jackets
Intake Port
371 cc intake port volume
450 cfm when purchased assembled with level 1 port work
475 cfm when purchased assembled with level 2 port work
Capable of accepting 2.35 to 2.45 intake valves.
2.425 intake valve is standard when purchased assembled.
Additional material under spring seat
AMPCO 45 valve guide material
Ductile iron seat is compatible with stainless steel and titanium
valves.
Other alloy seat material can be installed
upon special order.
Exhaust Port
179 cc exhaust port volume
320 cfm when purchased assembled with level 1 port work
355 cfm when purchased assembled with level 2 port work (379.9
cfm with 2Ό pipe)
Capable of accepting 1.94 exhaust valves. 1.88 exhaust
valve is standard when purchased assembled.
AMPCO 45 valve guide material
Ductile iron seat is compatible with stainless steel and titanium
valves.
Other alloy seat material can be installed
upon special order.
Casting / Machining Features
Certified A356 Aerospace Aluminum with T-6
Heat Treatment
Latest casting tooling technology which reduces core shift
Single piece water jacket core. Therefore, no cup plugs at end
of cylinder head.
Deck thickness of .900
Minimum port wall thickness of .250
Machined by state of the art CNC machines
Uniquely designed venting and gating methods which greatly reduces
porosity
Bare casting weighs 35 lbs
Quality Standards
All castings are x-rayed for defects
Dimensional layout performed
Certified A356 aluminum stock
Casting and machining facilities are ISO certified
Combustion Chamber
Available with semi-finished or CNC-finished
combustion chambers
Unique quenched style swirl design for improved
combustion efficiency
Bare castings have the combustion chamber in a semi-finished state
with unfinished seats and a volume of 74ccs, whereas the CNC-finished
chamber has a volume of 85ccs
Finished
/ Unfinished Combustion Chamber Versatility
The Eliminator Big Block Ford head has been engineered
to be one of the most versatile heads in the industry. For this reason
we offer the combustion chamber in the unfinished state. This gives the
purchaser who has their own porting capabilities, the latitude of forming
the combustion chamber and valve seats to their specific application.
Eliminator heads accept various valve sizes, depending on bore. Intake
valve sizes can range from 2.35 to 2.45 and exhaust valve
sizes from 1.88 to 1.94. As a result, the valve sizes have
a bearing on the combustion chambers final configuration. Also,
the unfinished chamber allows the chamber to be sized for a desired compression
ratio.
Hardware Provided With Eliminator Cylinder Heads
CNC finished combustion chambers and the following
equipment:
2.425" stainless steel intake valves, 11/32" stem
1.88" stainless steel exhaust valves, with 24 degree tulip,
11/32" stem
Ductile iron intake and exhaust valve seats
Serdi valve seat machining
AMPCO 45 valve guides, reamed and honed
Machined steel spring cups, with 1.75" OD
Teflon .531" diameter oil seals
Dual valve springs for maximum of .850" valve lift, with
1.625" diameter
Stainless steel retainers
10 degree valve locks
IDT 3/8 guide plates
ARP 7/16 rocker studs
Standard A style intakes can be used with this head
Standard tall valve cover (gasket) Ford SVO
Standard 3/8 push rods
Standard 1.73:1 ratio roller rocker arm (no shaft mounted needed)
Standard Ύ reach spark plug
Accepts Jomar stud girdle
Utilizing a 2.45 intake valve requires a minimum of 4.450 bore diameter
Best airflow results are with a 4.625 bore diameter
The spring pocket has been machined to accept a 1.75 O.D. steel spring cup
.250 minimum wall thickness (ports can be opened up to almost 5.0 square inches)
One piece water jacket core (no cup plug at either end of head)
.900 deck thickness (very thick for proper head gasket clamp load)
.100 extra material under valve spring pocket (port can be raised). When the port is raised there still is ample material under valve spring. This will prevent cracking due to high spring forces.
Smaller combustion chamber for higher compression ratio and reduced piston weight for comparable ratio.
Combustion chamber promotes swirl for faster burn rate (90/10 burn rate will be improved over older Ford Motorsport A head). Target is to achieve 90 percent of the burn within the first 10 percent of charge ignition. This will help increase the IMEP or indicated mean effective pressure, which stands for the amount of force applied to the piston. Maximum swirl rpm of 4000 rpm at .500 valve lift. This helps atomization of the air and fuel, and provides even combustion burning.
Intake Side
Intake Port Detail
Exhaust Side
Side View
Semi-Finished
CNC-Finished
Of course, Eliminator does offer heads with a CNC Combustion chamber, 2.42 intake valves, 1.88 exhaust valves, and an 85cc combustion chamber volume.
Assembled
Assembled Top View