What year did GM use castech heads?
What year did GM use castech heads?
Castech Heads – 1999-2013 Silverado & Sierra 1500 – GM-Trucks.com.
How do I know if I have castech heads?
The initial signs of cracked Castech heads are:
- Mileage of 100,000 to 200,000, but sometimes as low as 60,000.
- A slow loss of coolant in the expansion tank.
- No exterior sign of a coolant leak, such as dripping from the radiator, hoses or water pump.
- Frothy yellow emulsion under the oil cap (as shown in Figure 1).
Are 706 LS heads any good?
Although the 706 heads do have smaller valves compared to 317 heads, they are still solid performers that will keep your compression ratio in the sweet spot. 706 heads can be upgraded with larger valves for even more performance if you have the spare cash laying around.
Do 243 heads crack?
If the heads are 706 castings, chances are that they are cracked. You can improve performance with 243 heads, but you will need to mill them to maintain compression. Your best bet is to just get some 862s and have some work done to them.
What are LS 243 heads?
Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It has cathedral shaped intake ports and D shaped exhaust. The combustion chamber is slightly smaller and more efficient than the earlier heads used on LS1 engines.
How much power can a 5.3 LS handle?
See all 3 photos With just a mild cam and valvespring swap, a diminutive Gen III 5.3L LS can make north of 400 hp.
Are 5.3 706 heads any good?
GM’s 706 Vortec heads are the cheapest and most effective heads you can use for your 5.3L, or 4.8L, or even some 6.0L LS engine build. These cathedral offerings come stock with great flow and, unlike many truck heads, smaller factory combustion chambers (61.15cc) that won’t drop your compression into the basement.
Is the Castech 706 5.3 / 4.8 head affected?
Looks like an L92 head which is unaffected. Its only the castech 706 5.3/4.8 head that has issues that I know of. Not all 706’s are made by castech though so you have to pull the valve covers and check. It covers alot of vehicles from around 2001 to 2006.
Can a cracked cylinder head be Castech casting?
Important: If the cylinder head (s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss. Refer to the following illustrations on how to identify Castech casting and/or the very specific areas of the cylinder head (s) for a coolant leak from porosity.
Are there Castech heads on my GMC Truck?
It had castech heads and was going through a quart of antifreeze a month. This started about six months ago w/ only 45000 miles on the truck. I traded it in w / 50000 and it was starting to get worse. Just to let you guys know to keep a close eye on it.
What kind of heads are used for sand cast?
The early sand cast heads come as 862s and 706’s, and a die cast 706 that isn’t made by castech.
