Where are the casting numbers on Chevy small block heads?
Head casting numbers and the head casting date are located under the valve covers, in the rocker arm valley. This block number has been used in many different versions of this aluminum 18 deg and 15 deg Bowtie race head. Different chamber volumes, port volumes, port locations, valve sizes, etc.
What are the casting numbers on Vortec heads?
Types of GM Vortec Heads L31 Vortecs comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Originally, the stock #906 casting head was available in two versions.
How do you identify cylinder heads?
Cylinder heads may be identified by their casting number, located between #4 and #5 pushrods. General identification is as follows: 850-1100 heads have a heater tap at 90 degrees to the centerline of the engine. The space between the thermostat housing and the valve cover is small, at 1/16″.
How do you read Chevy casting numbers?
Read the next four digits in the code, which will be all numbers. This refers to the date that the engine was cast. The first two numbers are the month, and the last two are the day. For example, if the numbers read 0107, then the engine was cast on January 7.
How to identify SBC cylinder heads?
Crack test
How many bolts are in a cylinder head?
Mustang 1/2″ Head Bolts. 1979-95 Mustangs running a 351W motor will require the use of 1/2″ head bolts when securing cylinder heads to the block. The 351W motors featured 1/2″ head bolts, unlike the smaller 7/16″ bolts found on factory 79-95 302 5.0L motors.
What is the cylinder head casting numbers?
First letter – Decade of the manufacturer (D = 70s)
How to assemble cylinder heads?
Pete Hillemeyer has been the go-to guy for cylinder heads for almost 30 years.