4G63 FD

[Bean4g63]

I picked up an FD chassis last June.  I have wanted to do this swap for a few years now but could never pull the trigger and actually buy one. The car is a full street car, air conditioning, power steering, etc.  I am using the RX-7 tranmsission with a B2600 bellhousing. We made an adapter plate to fit the Narrowblock 4G63 to the Mazda Bellhousing. I also had to mod the subframe and drop the steering rack to fit the motor. I used the Samberg bumpsteer kit and modified it since I needed to drop the tie rods a bit lower.  Just about everything was fabricated/built in house including paint.  The car is a blast to drive as it makes 520whp on 93 octane.  It dead hooks 3rd gear and slightly spins 2nd gear with 275/40/17 regular Nitto NT05's thanks to boost by gear and traction control via the AEM series 2. With a full tank of gas and me in it the car weighs 2890lbs.  This is the setup:

-6bolt 4G63 bottom end
-CP 9:1 pistons
-Magnus Rods
-O-ringed Block
-ACL Race Bearings
-Mild Port 1G head
-Supertech 1mm valves
-Kelford 272 cams
-Magnus Cast Intake
-Either Precision 6266
-Custom Radiator
-Custom Exhaust manifold
-Custom 3" Exhaust
-Custom FMIC
-Custom IC Pipes
-Tial BOV and WG
-Custom Exedy Triple disc Clutch
-Walbro 400 intank pump
-Magnus fuel rail
-Aeromotive FPR
-AEM EMS V2 Honda box with custom wiring harness
-Braided AN line on everything including the power steering and A/C

FMIC mocked up:


Mock up motor:


Primed and ready for paint:


Turbo Manifold:




After paint:


Adapter plate:


Custom Clutch:


Rods and Pistons:


Motor installed:





Exterior Shot:  Still waiting for my Enkie RPF-1's


Gauge setup:


Dyno sheet:

[RX63]

hi, I was looking into your post and this is what I'm about to do. My car is a rx8, I will be using the rx7 tranny and the b2600 housing but for what I have read so far the 87 b2600 housing should be a bolt on to the 4g63 block and the rx7 tranny  right? why do you need the adapter plate? Thank you and I will be looking forward for more updates on this built, btw I have been a mechanic for 1g and 2g for 15 years now so that is why I chose the 4g63 block.

[SOB Racing]

The b2600 bolts to wideblock 4g63.   You need an adapter to bolt it to the narrow block setup.  I did the same thing on my FC 4g63 swap.    The adapter plate also allowed for the correct pilot bearing spacing.