[SOLD] Restored 340 X-Heads (ported)

[moparvinny]

For sale are pair of freshly ported 340 X-Heads. The heads are ready to be bolted onto your small block Mopar engine. The heads were ported/assembled by a well known facility in Metro Detroit.

Below is a breakdown of the work that has been completed. Please note the heads have never been installed on an engine following the porting/reassembly processes.

Baked blasted and magnafluxed heads (no issues)

All tapped holes were chased

CNC Porting - intake ports / exhaust ports and chambers

Installed guide liners in the intake and exhaust guides

Installed harden seats in exhaust for unleaded fuel

Cut spring pockets to remove ID step

Cut for valve seals - cut top of guide for seals

Milled exhaust face - fly cut exhaust surface

Performed valve job - cut intake and exhaust seats and grind plus back cut valves (2.02/1.625)

Milled deck - 70cc

Installed freeze plugs

Washed and assembled heads with the following:

10-degree steel retainers

Comp Cams 10-degree 11/32" with no lash caps recess

Comp Cams dual valve springs 1.437 OD, 322 lbs./in. rate, 1.150" coil bind height

Comp Cams valve spring locator, steel, hardened, 1.500" outside diameter, 0.060" thick (set of 16)

Installed Manley valves - exhaust (stainless steel: 1.625", diameter: 0.3415", stem: 5.065" length)

Installed Manley valves - intake (stainless steel: 2.020", diameter: 0.3415", stem: 5.040" length)

If you have any questions, please let me know.

Location: Metro Detroit

Price: $2,900.00

 

[MOPAROFFICIAL]

Can you provide a flow sheet please, thanks.
Int Port volume cc?

 

[moparvinny]

I reached out to the shop to see if they have the intake port volume on file. I did not see the spec called out on the sheet I have. Update to follow...

 

[superbeesrt8]

Did bob at modern cylinder heads do the port work

 

[moparvinny]

The Mopar community is so small that we cannot hide. Everyone knows our little secrets. Yes, Bob at Modern completed the work.

 

[moparvinny]

Unfortunately, Modern did not obtain the volume of the intake port. The did mention that it was a Stage III porting. I might need to locate a burette and get to measuring.

 

[moparvinny]

After the heads were completed, I started on my A-Body project where I ended up using 340 exhaust manifolds. A friend of mine advised me that I should avoid installing the ported heads on my 340, since I was using the stock exhaust manifolds and no stroker kit. Therefore, I purchased another set of X-Heads (less the porting) to retain the stock appearance. I do not have another project in the near future (for now), so I decided to sell the heads if someone needs at set. The cost is tied up in the porting. Those that are familiar with porting costs know that it's not cheap.

 

[moparvinny]

Additional photos