4G63 Exhaust Manifold Flange ( DSM / EVO )

Eaton MachineWorks

  • $800.00
    Unit price per 
Shipping calculated at checkout.

So, let me be clear due to the high amount of inquiries so that your time and mine aren't wasted. These flanges cost over $450 to produce just one flange. These are made to order and the cost reflects that. If you are looking to become a distributor or are interested in quantities over 5 units wholesale pricing is available & a Jobber account can be created.  


 As you can see it's very different compared to any other CNC'd flange on the market. I designed this model to specifically work with sch10 pipe ( machined fit +.005" tolerance ) with a .145" lock in depth. I had some issues with other flanges on the market I wanted to correct, issues being the extensive time resurfacing the flange face after welding & time port matching the I:D between elbow and flange & weld clearance issues with the top nut locations. I corrected all these issues & added some additional features I wanted.

 Features :
  • Machined out of a 16"x3"x2" 304 Stainless bar stock. 

  • Machined fit for sch10 pipe.

  • .5" flange thickness - 1.75" total thickness ( welding is done 1.75" from flange face which combats flange twisting, this means the flange does not need to be resurfaced after welding )

  • Outlet ports sit below the centerline of the exhaust ports for clearance to the upper 4 fasteners. 

  • All fastener locations have a sunken washer face solely for esthetic purposes 

  • all 4 flange inlet ports are roughly .125" larger than stock exhaust head ports. I did this for the guys who plan to go all-out running High boost applications and port their cylinder heads. It also gets rid of the bottom dip other flanges have from being transitioned on a .5" flange. Once the cylinder head ports are matched and transitioned it allows for a 100% smooth transition between the port and sch10 inlet

  • The outlet port is machined exactly to the ID dimensions of the sch10 pipe for ( ZERO ) port work by the fabricator.

  • Under each exhaust port is a 1/8" NPT threaded port for - Backpressure monitoring or EGT monitoring.

  • One feature not shown & will be implemented on further flanges is an o-ring sealing grove for use of a 1/8" copper o-ring. This will eliminate the use of a  traditional sealing gasket.

  • Designed specifically around a 12-point hardware kit. Factory & similar nuts won't work. 
( Manufacturing lead time - 4-8 weeks ) 

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