862 head is an option for the 4.6L and 5.4L Modular V-8 engine. This head is a great upgrade and bolt-on option to increase power. The 862 heads flow great to come with upgraded valves, springs, and cams, making this a great upgrade package.
The 862-cylinder head is one of the heads that you can pop in with decent gains. This head was designed in 94-95 to meet CA emissions standards, but you can make some power with minor porting and a little work to the combustion chamber.
Also, the 862 cylinder-head assemblies are commonly found on small block engines produced by Ford Motor Company after 1977. Some of the features that make the 862 such a reliable head include its self-aligning rocker arms, hydraulic roller lifters, and screw-in rocker studs.
862 heads are one of the most popular and versatile performance heads out. They have been the heavy hitter for making big power on small and big block Chevys alike.
They flowed 284 cfm when new in the box, more than enough for most street applications and plenty for mild racing applications. Hard to find these days, especially at a good price.
Are 706 and 862 heads the same?
Yes. They are both aluminum heads with 76 cc combustion chambers and the same port configuration, although they have different valve sizes. Why these heads have always been grouped separately, I have no idea.
The 706 head came on the 400 engines in the early ’70s, and the 862 head came out a few years later. As far as performance is concerned, I understand that they are also virtually identical.
Also, by design, the 706 and 862 are the same piece. The only difference is the marking stamped on top of the metal half (the casting number), stating that it is a 706 or 862.
What LS motor has 862 heads?
The LSA, LS9, and LT5 engines have the cylinder head designation of 862. The LS9 motor (also known as LSA) has 862 heads. It produced 580 hp in the ZR1 Corvette and 580 hp in the CTS-V (2010-15). The LS9 was also used in the 2010-13 Camaro ZL1.
The LS 454 uses a set of canted valve cylinder heads with two spark plugs per cylinder. The LSX454R block also comes with forged Mahle pistons, forged titanium rods with ARP fasteners, and a 6.385-inch billet steel crankshaft.
Also, the LS2 is the engine that made the most power in terms of a naturally aspirated, non-specialty GM crate engine. It produced 400 horsepower and 400 lb-ft of torque when it was new, and it continues to be a popular choice for hot rod engines today.
In addition, the LS2 has become known for its high-performance potential due to its large displacement, high compression ratio for a factory engine, and unique cathedral port cylinder heads.
799 vs 862 heads
An 862-cylinder head is a minor modification from the 799 castings. The intake ports are modified to move the centerline of the valve down & back (to provide adequate port volume). The coolant passages are also partially re-shaped to improve flow into the intake ports.
Some differences between the 799 and 862 cylinder heads are valve sizes and material, spark plug location, compression ratio, horsepower, and torque.
The 799 is a Gen 4 cylinder head, whereas the 862 is a Gen 5. The Gen 5 heads have 62cc combustion chambers and 2.12 intake and 1.65 exhaust valves, and 57cc combustion chambers and 2.02 x 1.60″ for the 799 heads.
The 862 heads have extensive machine work to optimize exhaust flow and have screw-in studs for rockers, hardened valve seats, and larger coolant passages that make these heads the most desirable set of stock LS1 style heads available.
Also, the difference between the 862 castings and the 799 is that they used a thinner aluminum head in the 862, which Mercedes designed to create lower emissions. The other difference is that the 799 needs four gaskets on each side, and the 862 needs only two gaskets, so cylinder heads are between 80-100 dollars cheaper. There may also be some tightening spec differences.
862 heads vs 706
The 862 and 706 heads are identical, except for two valves. The 862 head HAS two exhaust valves, while the 706 HAS only one exhaust valve. So, you will need to use a single exhaust set-up to use the 706 heads or change one of the exhaust valves from that head.
There is a lot of documentation and confusion surrounding the 706 cylinder head. The casting number 706 has become well known because it is the block casting number for the later-generation 5.9L Magnum engines.
This has caused some people to believe that the cast iron heads designated with 706 castings are the best production heads available for this engine family. Unfortunately, this isn’t the case. These heads have small intake ports and small combustion chambers, limiting their performance potential.
The best performance production cylinder heads for these engines have a casting number of 862.
862 heads vs 243
The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of the two heads. The 862 head is a rectangle port, while the 243 is a square port.
The 243 heads are for the LS4 Corvette, 862s are for the pickup and SUV engines. Same heads as the LQ4, but not machined or ported. The 243s have larger runners than the 862s. The 243s are amazing heads and outflow almost every other small blockhead available.
Also, both 243 and 862 are open chamber heads, but the chambers in the 243’s have more volume and correspondingly lower compression. In addition, the ports in the 243s are slightly bigger in cross-sectional area than the 862’s resulting in a better flow.
The 243’s have more swirl above 5000 rpm while the 862’s have more pull to around 3500 pm. Therefore, you would want to use a 243 head with a cam that has less lift and duration, or possibly a later closing intake lobe centerline for all-around or daily street use.
Use the 862 heads with a cam that gives higher lift and duration numbers for street-strip applications where you will run from below 3500 rpm up through 5500 or so rpm.
862 heads come on what motor?
The 862 heads come on all the normal small block motors from 1976-to 1985. So this will be chambered at 62 ccs if you have the 1,306 ccs. Engines, then you have the 906 heads, which are 64 ccs. So I hope this helps, Charlie.
Also, the 862 heads came on the following Chevy motors LT1, LS1, LT4, and the LSA. The LT1, LS1, and LT4 cam with two versions of these heads. A cathedral port configuration and a rectangular port configuration. The rectangular port head was only found on the Z06 and ZR-1 corvettes.
Are 862 heads good for boost?
Yes, the 862 heads are good for boost. They are a direct fit replacement for the Camaro/Firebird and Trans Am Stock cast exhaust manifolds. The ‘862 cast iron heads are a good quality cast iron performance heads.
They were originally designed for NASCAR, then released to the public as a performance option for big-block Mopar enthusiasts. The 862s have 2.14 intake valves, 1.81 exhaust valves, and 64cc combustion chambers, which give the head a 10.8 to 1 compression ratio when combined with a 4.280 bore block, and flat top pistons.
What engines came with 862 heads?
The 4.1L engine came with 862 heads in most models and was used from 1982-to 1987. The next generation of engines, the 4.3L, also used 862 heads from 1988-1990. The 862 head is an iron head used on the 307. The iron head is also a double hump head that does not have the same performance as the 487 double hump aluminum heads used in the 350s.
Also, 862 heads were fitted to the 455 cubic inch V8 engines built in 1970 and 1971. These engines had a 10.5 to 1 compression ratio, hydraulic lifters, and 350 horsepower. They were introduced in the Oldsmobile cars as a high torque engine.
In addition, all small-block Chevy engines originally used 882 heads that had a 64 cc combustion chamber. In 1967, the first big-block Chevy V8 was introduced, known as the rat motor. The heads on this motor were known as 627 castings and had 112 cc combustion chambers. By 1970, the head casting numbers changed to 337 heads with a 118 cc combustion chamber.
Are 862 heads good for nitrous?
Yes, they are. You’re good to go as long as the 862 heads have the 2.02 int valves in them with the right springs. With nitrous set up on your car, that could be cool to see if anyone else will be using nitrous and your supercharger.
They are amazing heads with the right combo. If you run into a turbo wall, those heads are one of the best make sure you have a serious cam and set up the carb right.
Are 862 heads good?
The 862 heads are a good choice for performance and racing applications. In addition, the chamber is well suited for tight clearance situations where larger valve sizes or special bore spacing are required.
For example, on Chevy 265 and 283 engines with a 3.750-inch bore, you want to run a Fel-Pro Print-o-Seal gasket. On such an engine, the larger 2.02-inch inlet valves of either 062 or 882 heads would protrude into the water jacket, causing a hot spot and running a risk of cracking the head due to the water pressure cylinder.
The 862 heads is a commercial and industrial engine used in many applications. The cylinder head is attached to the top of the block with the piston inside. The cylinder head performs several important functions:
Sealing the combustion chamber from the crankcase
Enclosing valves and associated components
Securing the camshafts
Directing cooling liquid through passageways in the engine block