Miata 2.5 Swap | What You Need to Know!

Another Miata enters the shop with a very suspicious sound emanating from the engine. Well, since the motor is toast, let's swap it for a 2.5! Brandon discusses and shows you the steps and parts to swap from the 2.0 liter to a 2.5. Parts needed for the swap are listed below.

Required parts list
• Duratec (Mazda L) 2.5L motor (preferably Ford origin for better internals)
• Wiring pigtail to VVT solenoid on the
2.5L motor (Ford WPT1251)*
• VVT solenoid gasket from 2.5L valve cover (Ford BR3Z-6C535-B)*
• Larger injectors (2.5L white-stripe injectors will work for a standard swap)
• Balance shaft delete kit
(massivespeedsystem MAEN'8647)
• Timing tool kit for Duratec motors (for installing crank pulley)
(massivespeedsystem MATO'8754)
• Laser iridium spark plugs (NGK
LTR5BI-13 if NA)
• Serpentine belt 905K6 or 5060905)
(for cars with AC)
• Dipstick (Mazda PE07-10-450)
• 2x diamond washers for crank assembly (Ford 1S7Z-6378-AA OR
Mazda L3H5-11-407)**
• Crank bolt - (Ford 1S7Z-6A340-AA OR Mazda LF01-11-406)**
• 2x Cam bolt - (Ford CV6Z-6279-A OR Mazda L568-12-428)**
• 2x Diamond washers for cam (FORD 6M8Z-6278-A OR MAZDA L3K9-12-
429)**
• Tube of RTV/liquid gasket
Kits available at
www.arhindrichs.com/store
*Not necessary to order if it comes with the
2.5L. Refer to section 2.
**One-time use part. Do not reuse.
Additional helpful part numbers
• Exhaust studs on head (Mazda
LFE2-10-104)
• Header-to-midpipe studs (Mazda
L3M7-40-584)
• Alternate front engine cover which does not require modification for belt clearance (Mazda LAW-10-500)
• Alternate block breather which does not require modification for intake manifold clearance (Ford 4L5Z-6A785-AA)
• Alternate head bolts from EcoBoost motor (Ford AG9Z-6065-A)
• MazdaSpeed valve springs (Mazda
L3K9-12-125)
• 34mm VVT solenoid -
6M8Z6M280AA (OEM 2.0L or earlier
2.5L motors)
• 34mm VVT gasket - 5M8Z6584AA (OEM 2.0L or earlier 2.5L motors)
• 30mm VVT diameter solenoid - CJ5Z6M280A (later model 2.5L
motors)
• 30mm VVT gasket - BR3Z6C535B (later model 2.5L motors)
List of OEM coolant system part numbers:
• NE51-61-24X Short fat upright hose behind head
• LFG2-15-18Y Hose & pipe assembly from thermostat to radiator
• LFG1-15-184A Upper radiator degas to reservoir hose
• LFG1-15-381B Larger hose from radiator to reservoir
• NE51-61-2EX Longer heater hose
• NE51-61-2EY Shorter heater hose
• LFG1-15-18XC Hose & pipe assembly from radiator to rear of engine, includes throttle body hose
• LFY1 15 0D0 Cide of head to reservoir hose
• LFE2-15-260A Hose under intake manifold
• LFE2-15-169 Rear water outlet gasket
• NE51-61-24YA Heater pipe to coolant tree hose
• LFG2-15-536 thermostat to coolant tree (without oil cooler)
• intake manifold runner (may be ported to match 2.5L head).
• EGR valve & rear coolant outlet
4. Upgrades & maintenance to consider "while you're in there"
• Rear main seal
• Front main seal
• Valve cover gasket
• Replace starter
• Clean/upgrade intake manifold
• Clutch/flywheel
• Upgraded block breather
• Motor mounts
• EGR delete
• Cams
• Radiator
• Header/full exhaust
• Oil cooler
• Turbo/supercharger system
• Catch can
• Heat shielding transmission tunnel,
engine bay, exhaust components, etc.
• LFE3-15-54YB Thermostat to oil cooler (with oil cooler)
• LFE2-15-536B Oil cooler to coolant tree (with oil cooler)
• L309-15-271 Pipe above thermostat assy, pressed into block
3. Parts needed from NC 2.0L
• oil pan
• oil pressure switch on oil filter perch (green)
• valve cover
• crank pulley
• fuel rail
• intake manifold
• pulleys & tensioner
• accessories
• intake manifold runner (may be ported to match 2.5L head).
• EGR valve & rear coolant outlet
4. Upgrades & maintenance to consider "while you're in there"
• Rear main seal
• Front main seal
• Valve cover gasket
• Replace starter
• Clean/upgrade
intake manifold
• Clutch/flywheel
• Upgraded block breather
• Motor mounts
• EGR delete
• Cams
• Radiator
• Header/full exhaust
• Oil cooler
• Turbo/supercharger system
• Catch can
• Heat shielding transmission tunnel,
engine bay, exhaust components, etc.

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