Category: 862 heads

862 heads

See all 23 photos. Back in the early s the Gen II LT1 and LT4 engines powered GM's hottest performance cars, but GM read the tea leaves and knew that this platform would not be able to get them where they would eventually need to be in terms of emissions, CAFE standards, or even performance. A new V-8 was needed and in work began on what would eventually be labeled the LS1. Replicating the success of the original small-block was a huge undertaking, GM kept the basic structure of a single cam pushrod V-8, but nearly everything else was reworked from the deep skirt block to the firing order.

A coil-near-plug arrangement replaced the trouble prone Opti-Spark and to save weight the blocks would be cast aluminum with iron sleeves. The new LS1 displaced 5. The LS1 debuted in the Corvette and moved to the Camaro in Indifferent versions of the LS design, such as iron blocks with varying displacements, started showing up in trucks and SUVs.

Are Chevy 706 Vortec LS heads any good? Hell yes they are!

Over 18 years of production GM came up with many variants suited for different applications, and the best part for those of us in the hot rodding world is that, for the most part, all the various iterations of the LS platform play well with each other in terms of parts interchangeability. No problem. Toss LS3 heads onto an LS2 block?

Yep, you can do that to so long as you have the right intake manifold. A lot of this is possible due to the similarities shared across the LS line over the years. Some of these similarities include:. The new firing order of gave the LS1 a unique sound compared to its Gen I and Gen II cousins, and the overall size was kept close to that of a Gen I small-block making it easy to swap into almost anything. The LS1 debuted with 3. For the most part, this formula was carried forward through the Gen III and Gen IV engines with the exception of some of the higher performance engines.

Let's take a look at the LS engines you're most likely to come across out there. The LS1 5. Aroundsome of the LS1 engines started receiving the improved LS6 parts such as the intake manifold, heads, and stronger block.

The LS6 5. While it shares displacement with the LS1, it features a revised block with improved bay-to-bay breathing, greater strength, higher compression, revised pistons, and other small tweaks.

The LS6 also received better castings heads, a slightly more aggressive cam, and a much improved intake manifold. The LS2 6. Early LS2 engines had 24x reluctor wheels and 1x cam sprockets while later ones transitioned to the 58x reluctor and 4x cam sprocket arrangement.

Depending on the year and platform, the LS2 could have come with either head.Simply follow this procedure: -Remove the cylinder heads from your car -Disassemble cylinder heads to completely bare condition -Wash cylinder heads -Print a copy of your order confirmation, put it in the box and send the heads to: Katech Inc. Clinton Twp. Please be sure to properly package cylinder heads with plenty of bubble wrap protection on the corners.

We have found that when shipping cylinder heads a box, wrapped in bubble wrap, within another box offers the best protection from damage. Please do not use packing peanuts. If you would like Katech to disassemble, wash and re-assemble your heads, please add those services to your order using the related product links below.

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LSX Head cast numbers / flow /swap info

The Shopping Cart is currently empty. Shopping Cart Software by Nexternal. Previous Product. Next Product. Ship To: add new yourself. Pick Up At Katech Inc. Disassemble Cylinder Heads.This is a discussion on Diff in vs heads?

I'm hearing the is good-where does the come in at? The is Forum Rules. Remember Me? What's New? Results 1 to 10 of Diff in vs heads? Add Thread to del. Thread Tools Show Printable Version. Looking at both of these. Share Share this post on Digg Del. Well, I guess like it or not I picked up the pch cnc'd heads for 5 bills. They say the flow.

5.3 706 / 862 heads on a 6.0 LQ4. Why I’m using them! 2001 GMC Sierra C3. S1, E4.

What is the cc size on these? I'm considering just picking up a set of aftermarket rockers with an upgraded ratio vs a cam swap right now. If going with a cam, I guess I'd not do the rocker swap, but what cam would be a good choice for civilized street manners, stock style idle and yet decent enough gains to justify the expense?

What else should I be doing while swapping over the heads? Last edited by dbs1; at AM. Smaller combustion chamber Larger combustion chamber. Gains from a higher ration rocker arm 1.This was due to higher flowing Cathedral port heads, more compression, and a slightly bigger cam.

In fact, they can make more power than a LS6 or LS2 with boost due to the thick cylinder walls. This reduces expense when you build it up. This will definitely free up a few horsepower and gives the little engine a big personality. Trucks often came with mechanical fans that sap horsepower. An electric fan kit will free up that power. We recommend that you talk to your local chassis dyno tuner and decide on a computer programmer. Raising the factory redline is a big part of this because it allows your vehicle to be in the meat of the powerband longer.

Torque limiting can be completely shut off, shift points can be raised and it makes it easier to tune for a bigger cam and injectors later on. Before beginning the tuning process, we recommend installing a colder thermostat to open up the tuning window.

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The factory cam is tiny and really holds the engine back. What you need is a cam that delivers a gut-punch right when the converter hits.

862 heads

We recommend a dedicated truck cam. If the engine is going in a lighter car with deep rear-end gears and a high stall converteryou can be more aggressive with duration.

To maximize torque in the mid-range in a truck cam, manufactures close the intake valve at about degrees. Turbo cams reduce overlap with less exhaust duration split in relation to the intake. The stock rockers are good up to lbs.

You will want to install a trunnion kit for added reliability. Beyond that. There are a few other parts needed for a L33 cam swap such as an LS2 timing chainLS7 spec liftersLS2 timing chain damper and thick-wall chromoly pushrods. Tuning the computer changes the fuel and ignition curves to increase performance.

862 heads

Ask your tuner what injectors they prefer and have them ready to save yourself an extra trip to the dyno. If you upgrade and depending on the injectors you run, you may need a fuel injector adapter harness. The L33 is a returnless system.

Ultimate LS Cathedral Port Cylinder Heads Guide

In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. When running boost, you can use a water-methanol system to supply extra fuel and lower charge air temps.

A better option is the Chevy Trailblazer SS or the They are the best of the factory manifolds with a 4-bolt 87mm throttle body, bigger standard EV6 style injectors, and will pick up about 15 horsepower.

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Keep in mind, the original throttle body had an 8-pin connector. To run the newer style 6-pin throttle body requires a Torque Rush X-Link harness adapter.

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You can achieve it with good drivability and power across the entire rpm range by upgrading the cylinder heads. Aftermarket heads reduce downtime and are cost-effective when you sell your old heads in good condition. The decks are thicker to withstand more boost.

862 heads

A cc runner head is a good match with the TBSS intake. The combination of the two will pull strongly up to 7, rpm. With a bigger cam you can mill the heads for up to They can be cut to 2. The flat-top L33 pistons added some much needed compression.

They have stronger wristpins, thicker ring lands, and the added valve reliefs allow you to run big cams.See all 5 photos. GM's Vortec heads are the cheapest and most effective heads you can use for your 5.

Bold statement? Well, not really. You see, these heads have been around a long time, and dozens of dyno tests have shown that the often overlooked Vortec head can give you great performance. These cathedral offerings come stock with great flow and, unlike many truck heads, smaller factory combustion chambers These heads came on hundreds of thousands of and up GM 5. And according to our Econ class, a large supply generally equates to a lower price. Most people tend to grab up heads because they have the same improved ports as the more expensive and heads.

But the heads have much larger combustion chambers This loss in compression ends up being a net horsepower loss even with the heads' superior ports.

Dyno testing on an LM7 5. Yeah, you could mill down the heads, but that costs cash, so in stock form the heads are still king of the budget-friendly hill in terms of cost versus performance. The Vortec heads are even slightly superior to the commonly found heads. The reason is that the heads are SPM semi-permanent mold made, while the heads are sand cast.

The SPM method is considered to be a more consistent process, but once you port the head, any difference to the head goes away. Again, porting unless you do it yourself costs cash, so in stock form the head still beats the casting.

Used prices are often much less, which helps make the heads some of the best-performing, affordable, cathedral-port factory heads out there. Common cathedral-port production casting numbers: — aluminum perimeter bolt 5. Close Ad. Are Chevy Vortec LS heads any good? Hell yes they are! Are Heads Better than or Heads? Why Vortec heads make a great choice:. Share on Facebook Share on Twitter.For a street car, this design means excellent throttle response, torque and average power. Dyno tests have proven that comparable aftermarket cathedral port heads can match a rectangular port in peak power, while proving much more impressive below the curve.

For road racing, a cathedral port is ideal, and has even proven to be quite capable in drag racing with an altered valve angle and larger runner sizes.

There are changes throughout the model years, which are indicated with various casting numbers last three digits are the part number. Though no longer produced by GM, all versions are fairly abundant used and work with any factory or larger bore. If you are new to Gen IIIs, please note that these heads are aluminum and unless otherwise noted, so is every other head in this book. Following directly in the engineering footprint of the LS1 casting, these cylinder heads were used on the 4.

The only differences between these heads and the LS1, besides the price, are the valve size and combustion chamber. Out of the box, the small valves make these heads a poor choice for performance applications, but these components are easily upgradable, which often makes for a great high-compression head that is easy on the wallet.

These heads have been phased out of production in favor of higher-flowing, LS6-based castings. These heads came on low-performance 6.

The early design was the only castiron LS head ever made, and the least desirable in a performance application. However, the later heads can be a good choice for boosted applications because they offer larger runners and combustion chambers for lower compression over the factory LS1 heads.

Because these heads are no longer in production, they must be purchased used. Though they are not the most common, they are also not the most desirable, so the price tag is usually very reasonable and work with any bore size. The hipo 6. Though the runners are identical to those on the LS6, its combustion chambers are larger, just like the LQ4. These heads are no longer in production, replaced on 6. Because of the small valves, these heads fit on small-bore applications though the large chambers may be a bit much.

In its most potent form, these heads supported a conservatively rated hp on the Z06 Corvette. In production these heads have been repurposed on the aluminum 5.

Although Chevrolet has invested plenty of time and effort into engineering a fine array of cylinder heads for the LS-Series engines, it still must focus on the needs of the massmarket consumer. Aftermarket companies have no such restrictions, and can craft performance-specific castings to meet the needs of racers and hardcore enthusiasts. Some of them are custom porting jobs based on existing factory castings, while others are completely custom castings.

This means an incredibly broad range of port sizes, chamber depths, and valve options exist for the discerning LS head shopper.

If you need to feed a big-inch stroker LS or are adding forced induction, a well-engineered head that can aid your quest for power almost certainly exists. Please note that the flow numbers have been provided by the manufacturers, and may not be perfectly comparable because they were acquired on different equipment.How ever, They need to be matched up with the proper engine combo to see any gains.

Chamber Intake cc Exhaust 70 cc A thorough porting and millimg job plus a valve upgrade on these will really wake up your engine. The heads have undergone only minor revisions since their introduction inmost notably a switch from perimeter to center valvcover bolt configuration for the model year.

Each style has its own dedicated valvecovers and coilpacks mounting apparatus. Exhaust 75 cc The LS6 cylinder heads is essentially a tuned-up version of the LS1 head. At 65cc, the combustion chamber is slightly smaller and more efficient than the LS1.

The more efficient design shortens burn times and ultimately means less ignition timing advance is required to produce the same power. And because less timing allows more efficient combustion, the Ls6 heads allow the engine to produce more torque.

The exhaust port is a unique D-shape that improves flow. LS6 heads are the best choice only when all-out power is needed.

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Be prepared for a big price tag at the dealer or steep core charge from your head porter. Intake cc Exhaust 70 cc -- 93 These small combustion chamber truck heads offer no advantage over an LS1 head except the smaller combustion chamber. This along with milling of the deck surface will allow a slightly higher compression ratio to be achieved.

Because of the smaller intake valve installed in these heads a valve upgrade is practically mandatory. Exhaust 75cc The LQ4 head received aluminum heads starting in models year All other features are the same as previous years iron heads. They offer a large combustion chamber that lowers compression ratio making them perfect for a forced induction application. Swapping on the LQ4 head drops the compression ratio of a typical LS1 engine to So you want to figure out how much to mill:.

It takes about. It takes. You have a stock 66cc chamber and you want to get down to 63cc. You can also do the reverse, say you want to mill a head.

Milling a stock 5. Once ported any "advantage" the cast had is moot. This appears to be one of the common misconceptions about heads having the casting no.

862 heads

The LS2 heads or casting have the "heavy" standard LS1 valves. However, they do have the LS6 springs. Only the true LS6 engine heads have stainless steel not titanium hollow stem valves the exhaust stems are sodium filled. These valves are slightly longer than LS1 valves too. New LS2 heads are about half the price of new LS6 heads check sdparts. GM is "really proud" of those hollow stem valves! Still a desirable set of LS1 heads though!

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