What engine has 0821 heads?

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6.2 LS2 LS3 Chevrolet engine
See details for description of any imperfections. This set of rectangle port heads are from a 6.0/6.2 LS2 LS3 Chevrolet engine. The cast number is 0821. This is a drivers side and passenger side head and are good pull-off heads.

What’s the difference between 821 and 823 heads?

From what I understand there is no real difference in the 821 and 823 other than valves and springs. The Ls3 version has the light weight valves and better springs. There is another casting number for the L92’s that is suppose to be a rougher earlier design, that would be the one to avoid unless it’s ported.

What heads came on LS3?

The LS3 821 heads had hollow-stem valves, as did the LSA supercharged engine with the 863 heads. Heads for the LS9 used titanium intake valves like the LS7. The main difference between and LSA and LS9 head are the valves. The LSA heads also used a stronger rotocast A356-T6 alloy.

What LS heads are rectangle port?

By contrast, rectangular port heads were offered on the Gen IV version of the LS, the most famous being the LS3, but they were also installed on the L92 and L76 truck engines.

What did LS 243 heads come on?

The 243 heads came on the LS6 engine produced from 2001 to 2006. It was typically found in the C5 Corvette, but it was eventually ported to the LQ4 and LQ9 to meet truck specs.

What are the best LS heads?

The LS6 was designed specifically by GM to surpass the LS1 as the best performance head, and it did such a good job that the “243” casting was recycled on the LS2. Aside from the LQ9, which is a copy of the LS6, these are the best performing of the OEM cathedral ports.

What CC are 823 heads?

A Look into LS Cylinder Heads

CYLINDER HEAD CASTING NUMBERS
Casting No.	Description	Chamber (cc)
317 / 035	LQ4 / LQ9	71 cc
373 / 873	LQ4	71 cc
364 / 716 / 823	L92 / LS3	68 cc

What CC are 821 heads?

Three different sizes are offered in AI’s “821” casting, starting at 270 cc and then going up to 280 cc. The largest of the three is recommended for high-RPM and large-displacement applications, and the smallest works well in the 600- to 700-hp combinations that stay below 7,000 rpm.

What LS heads are the best?

What LS engine has 243 heads?

LS6 engines
The 243 heads came on the powerful LS6 engines from 2001 to 2006. Although the heads were initially made for C5 Corvettes, they later found their use in engines like the truck-spec LQ9 and LQ4. The LQ4 and LQ9 had 6 cc larger combustion chambers. LS6 was also used in some Camaros and Pontiac GTOs.

Which LS heads are the best?

What heads are better 706 or 243?

Test after test has shown the 706 heads to have a more powerful output over the majority of the RPM curve when compared to stock 243 heads.

How much HP gain on 243 heads?

A pair of 243 heads add up to about 20 horsepower (hp) on the GM’s bolt-on LS1 or LS6 engine. Since the engine already features an aggressive camshaft, it might experience a little bit more horsepower.

Are 706 heads better than 862?

While 862 heads are sand cast, 706 heads are semi-permanent mold. Also, they have smaller combustion chambers, and the milling of the deck surface will allow a slightly higher compression ratio than the 706 heads. Except for this, there is only a negligible difference between 706 and 862 heads.

Are 862 LS heads any good?

In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.

Are LS3 and LS7 heads the same?

If you try the LS7 heads, you will also need an LS7 intake. The intake ports on the LS7 heads are different than those on the LS3. Instead of LS7 heads, I would either have the LS3 heads ported/polished or go with an aftermarket casting that’s designed for the smaller bore of the LS3 (like Mast or PRC). Just my .

What LS engine had 243 heads?

What is so special about 243 heads?

The 243 heads release about 5% more power on their flow alone. What is this? The power enhancement is because of its hollow valve stem, which delivers a better RPM potential, standing up to more turbo or supercharger applications. 243 heads were improved with more flow and a little bit more compression than LS1 heads.

Is it worth porting 706 heads?

Now, porting the 706 heads will definitely help power. We have seen ported versions of these heads from sources like Total Engine Airflow unearth flow numbers that exceed 300 cfm, so flow potential was not a problem.

What did GM 706 heads come on?

See all 5 photos 706 heads can be found on scores of 1999 and up GM 5.3L and 4.8L engines.

Are there any brand new GM 0821 heads?

I have came into possession of a couple of sets of Brand new GM 0821 casting heads. These are brand new never been bolted on a block assembled heads. For those of you not familiar with the 0821 castings they are the LS3 factory heads with 2.16 hollow stem light weight intake valves and 1.6 sodium filled exhaust valves.

What are the specs of a 0821 head?

For those of you not familiar with the 0821 castings they are the LS3 factory heads with 2.16 hollow stem light weight intake valves and 1.6 sodium filled exhaust valves. They are unmilled so they still have the 70cc combustion chambers. I do accept paypal.