Are 706 heads better than 862 heads?
Are 706 heads better than 862 heads?
The 706Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand cast. The SPM method is considered to be a more consistent process, but once you port the 862 head, any difference to the 706 head goes away.
What should I look for in a cylinder head?
For example, a cylinder head may deliver impressive numbers at .700-inch lift; however, a street engine doesn’t typically provide that much. It is more practical and beneficial to look at the airflow numbers in the
What are the casting numbers for a Ford cylinder head?
If you’re performing a correct restoration or a budget build, sometimes an original FoMoCo cylinder head is what you seek, so no matter whether you’re scouring the internet or junkyard, the following Ford cylinder head casting numbers should help you figure out what you’re looking at and where it came from.
How to find a donor for a head swap?
Use the following criteria to find a donor drive. Model number: It is ideal to match the whole model number, but if none is available you can try one that matches the entire first part of the model number as well as these three characters in the second part: WD1600JB-40TGB0 Heads map: Match the physical heads (PH) map exactly.
What are the requirements for a head stack replacement?
The main requirements for successful head stack replacement are experience and, certainly, practice. For this purpose author suggests finding some dead drives of the same manufacturer, and do some experiments. If after such practice you are confident about your abilities to make head stack replacement to get the data — then good luck!
Where are the casting numbers on a Chevy cylinder head?
High-performance usage requires more consideration if you’re going to use original factory cylinder heads. For performance use you have to consider port shape and size, chamber design, and compatibility with later-model Gen V and VI blocks. Cylinder head casting numbers are usually located on top of one of the intake runners.
How to tell the difference between Big and small block heads?
Scrape the oily goo off and read the letter at the lower left corner of the head, near the #1 or #8 spark plug hole, a letter about 1.5″ high indicates a big block, while a number indicates a small block. Some have an additional letter (an A or B), about 1″ high, right next to the letter (or number).
Use the following criteria to find a donor drive. Model number: It is ideal to match the whole model number, but if none is available you can try one that matches the entire first part of the model number as well as these three characters in the second part: WD1600JB-40TGB0 Heads map: Match the physical heads (PH) map exactly.
Where are the letters on a big block head?
A Big Block Head Scrape the oily goo off and read the letter at the lower left corner of the head, near the #1 or #8 spark plug hole, a letter about 1.5″ high indicates a big block, while a number indicates a small block. Some have an additional letter (an A or B), about 1″ high, right next to the letter (or number).
