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Case Study: Preheat Oven for Cylinder Heads

This oven can be modified to suit your application,
just call us at 888-763-6836

Customer Background:

Company:  Valley Speed Machine Shop Ltd.
Part to be Preheated: Cylinder Heads
Part Material: Cast Aluminum
Part Dimensions: 10" W x 9" H x 33" L
Part Weight: 40 lbs
Target Preheating Temperature:  Range 250°F - 500°F
Number of pieces to be heated at one time: 1
Required preheat  time frame: None Specified

Project Background:

Valley Speed Machine Shop in Kamloops, BC Canada discovered PreheatOvens.com while searching for an oven that could preheat cylinder heads. They had difficulty finding a heat treat oven in the length they needed elsewhere, and were happy to know we could provide a customized heating solution for their needs. Valley Speed performs weld repairs on cylinder heads, and has to preheat the blocks to around 400F before they do any repairs.

They noticed one of our ovens had the length they needed - the KPH-43 - but the width and height were not quite the right size. We simply increased the shell of KPH-43 preheat oven from 12" W x 12" H to 16" W x 16" H. Only a few extra inches were needed, but Valley Speed needed some extra room to maneuver the part into the oven and to remove it. The KPH-43 was modified and became the KPH-43A for this project.

K-PH43A Preheat Oven Specifications:

Shelving Style: Flat, perforated
Temperature Control: Dial-Adjustable on control panel
Temp Range: 150F-550F
Voltage: 240V
Wattage: 2000W
Cycle: 50 or 60
Thermometer: Bi-Metal thermometer in door
On/Off Light: Yes
Insulation: 2"
Interior Dims: 16" W x 16" H x 44" Deep
Exterior Dims: 27" W x 26" H x 51" Deep
Net Weight: 237 lbs.
Shipping Weight: 330 lbs.
Shipping Dimensions: 35"W x 35" H x 60" L

Oven Construction


The K-PH-43A heat treating oven is constructed of carbon steel throughout. The oven exterior has a highly durable, powder-coat finish in blue that is resistant to scratching and corrosion. This is a front-loading, bench-top style preheating oven and is designed to be stored on an elevated surface for ease of access to the parts being preheated. The door hinges are tack-welded to ensure smooth operation for many years. The control panel which houses the dial adjustable thermostat is mounted on the side of the oven with heavy-duty rivets. A standard "ON/OFF" indicating light was also provided, which is bright enough to be seen from a distance. A variety of temperature control methods are available at preheatovens.com.


The shelf in the KPH-43A is the base itself. It is perforated which allows the heat from underneath to radiate through the shelf and heat the part effectively. Various shelving styles are available at preheatovens.com suitable for almost any custom preheating application. There are two 1000W tubular elements located at the base of the KPH-43A preheat oven, and they are protected by the shelf itself. The interior of all our preheating ovens are painted with a reflective, galvanized paint and the interior welds are touched up with high-temperature aluminum paint.

All our preheating ovens are made in the USA and feature a 1-year limited manufacturer's warranty. Parts are readily available.

Oven Photos

Part to be Preheated


For more information or to find a Keen distributor near you:
Call: (888) 512-2870 (USA only)
Email: Sales@keenovens.com

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