4.6L / 5.4L 4V Stage 2 CNC Porting Package
MHS 4.6L / 5.4L 4V Stage 2 CNC Porting Package - This is for 03/04 Cobra / Mach 1 Heads only. For GT500 Heads, please see our GT500 specific packages.
Short and Sweet Description: This Package includes our Stage 2 CNC Porting Program with Hand Blended Bowls to Seats, Bronze Guides,Performance Valve Job, MHS / PAC Stage 2 Valve Springs and Retainers, Polished and Re-Ground Stock Valves, Viton Stem Seals, Surfacing and Assembly
Stage 2 CNC Porting Package - Not so short description
We start by disassembling the heads, thoroughly inspecting them for any possible damage, removing all oil galley plugs and freeze plugs, removing the old valve guides, deep cleaning them and bead blasting the ports and chambers to remove any additional carbon deposits. The heads are then ran through our Stage 2 CNC Porting Program and then to our Seat and Guide area where our custom Bronze Guides are installed and honed to size. We then perform our Performance Valve Job (4 Angle Intake, 3 Angle / Radius Exhaust) and then blend the bowls to the valve seats. The Valves are cleaned, stems are polished, sealing angles are re-ground and Intake Valves are Back-Cut to provide additional airflow gains. The Heads are then surfaced on our CBN / PCD Surfacer and Assembled with our Viton Valve Stem Seals and our PAC Stage 2 Valve Springs. We have multiple Valve Spring options as an upgrade. Heads will also be assembled with new USA Made Brass Freeze Plugs and New Oil Gallery Plugs.
03/04 Cobra Guys and Gals - Please be aware that the 03/04 Cobra, Mach 1 and Aviator Heads all have less than adequate Exhaust Valve Seat press fit. We are not sure why, nearly every set we have seen in the last 3 years has had at least one loose exhaust seat. We will not take any chances in sending a set of heads out that we are not 100% confident in. We haven't had any Valve Seats fall out and we aren't planning on it! With that being said, we will have to replace the Exhaust Seats with a better alloy and fitment. The cost of this is an additional $320.00 and includes the price of the Valve Seats.
Cylinder Heads are to be sent in with camshafts, lash adjusters and followers removed. If you would like to leave them in the cylinder heads, we can clean all the parts, polish up the camshafts and re-install everything for an additional cost. You will also have the option for us to install new OEM Lash Adjusters which is also a good idea. Please call in your order for this option.
- Disassembly and Cleaning of all Parts
- Bead Blasting of Ports and Chambers
- Stage 2 CNC Porting w/ Hand Blending Bowls to Seat
- MHS Bronze Valve Guides - Honed to Size
- Performance Valve Job (4 Angle Intake, 3 Angle / Radius Exhaust)
- Reground Stock Valves with Polished Stems and Back Cut on Intake
- MHS / PAC Stage 2 Valve Springs
- MHS 4130 Chrome Moly Retainers
- CBN Surfacing
- New Viton Valve Stem Seals
- New Brass Freeze Plugs and Oil Gallery Plugs
SHIPPING- After your order is received, we will ship out a set of Cylinder Head Boxes to you with Pre-Paid Return Labels, all the proper packaging and packaging instructions to ensure your heads arrive safely. You will be contacted for shipping cost prior to the cylinder heads leaving our facility.
- Item Requires Shipping
- 100.0 lbs.
- W24.0000” x H12.0000” x L12.0000”
- Free Shipping!
Total Reviews (0)
Write the First Review!
You must login to post a review.