1989-1998 Cummins 5.9L 12 Valve Premium Stock Plus Head
SKU: PDM-12VSTKH
Product Description:
The Industrial Injection 5.9L 12v Cummins Premium Stock Plus Heads are designed to be an affordable & reliable upgraded head complete and ready to bolt-on.
Features:
- New Performance Stainless Steel Valves:
We use the highest quality upgraded stainless steel valves with a nitrate coating for ultimate durability to out-perform and outlast any aftermarket or OE valves available.
- High Strength Alloy Valve Guides:
New High Strength Alloy, Heat Treated iron-based valve guides are installed. These guides are heat-treated to Rockwell 22 "C" Scale, which produces the ultimate in wear resistance. This is far superior to original guide material, including Bronze. The guide incorporates a spiral grove inside the guide to hold oil and aid the lubrication of the valve during engine operation.
- Valve Springs:
We use the highest quality brand new performance 150lb valves springs custom made right here in the USA. We designed these springs to offer more lift than the competition. Each valve spring is tested multiple times in-house before assembly to ensure it maintains it proper spring rate.
The Build Process:
Heads are jet washed in a high-pressure spray cabinet to remove oil and dirt, then glass beaded to remove carbon. Next, they are checked by magnafluxing, (cast iron only) or pressure testing. They are visually inspected for defects that would make them unusable. Valve guides and seats are removed as needed for porting.
Port development is accomplished using a superflow 600 flow bench with a computer recording all flow measurements. Many things are considered when designing a cylinder head Port; airflow is only one of the things to think about. Another major concern is port wall thickness.
Anyone can get a head to produce high flow numbers, but if doing so leaves the port wall too thin the casting will crack. High-performance Diesel heads are more prone to crack because of the thermal shock experienced by excessive intermittent or long-term exhaust temperatures.
New High Strength Alloy, Heat Treated iron-based valve guides are installed. These guides are heat-treated to Rockwell 22 "C" Scale, which produces the ultimate in wear resistance. This is far superior to original guide material, including Bronze. The guide incorporates a spiral grove inside the guide to hold oil and aid the lubrication of the valve during engine operation.
Guides are then honed (not reamed) to exact size using a diamond honing mandrel. Diamond abrasives allow for consistency of size, surface finish, and bore geometry with no variation from guide to guide. The guide size is then verified using a valve guide bore gauge.
Next, the head is treated to a multi-angle valve job to help maximize the flow of air in and out of the head. This is accomplished using a Serdi 100 guide and seat machine. Serdi uses a solid carbide straight shank pilot. When inserted into the valve guide, it simulates the real valve stem during the centering process. This guarantees the valve seat is finished for a perfect valve to seat match.
Using CBN or Diamond tooling the head is given a new surface. With our berco milling machine, we can control the surface finish to accommodate different head gasket types. For example, MLS head gaskets require a very smooth surface finish.
Finally, the head is jet washed dried, and assembled with new valve seals and new performance valve springs.
Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.
Please return all cores to:
INJECTORS AND FUEL PUMPS
Industrial Injection Service Core Returns
1201 South 700 West
Salt Lake City, Utah 84104
TURBOS, ENGINE PARTS, & RETURNS
Industrial Injection Diesel Core Returns
2858 South 300 West
Salt Lake City, Utah 84115
INCLUDE RGA# THAT WAS ISSUED AT TIME OF PURCHASE! If RGA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.
Core return freight is the responsibility of the customer
FULL CREDIT WILL BE GIVEN WHEN:
In order to receive full core credit, your core(s) must be returned within 60 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection Service are the responsibility of the customer and their shipping company.
½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:
- Core is acceptable but has been returned after 60 days of invoice and before 90 days
- Slightly damaged housing or camshaft
No Core Credit issued when:
- Cores is seized or hydraulic head is cracked
- Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
- Core is fire damaged
- Core is returned after 90 days/3months
Please do the following when returning a core:
- Make sure you have removed all fittings from your old unit
- Drain all fuel and oil from unit
- Package cores so that fuel and oil does not escape from the package
NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.
- Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
- All shipping charges are the responsibility of the customer
- Please write on the box “Core Return” and have RGA # clearly written on the outside of box
- Include copy of original invoice and RGA inside box
PLEASE RETAIN RGA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RGA #.
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