Correspondingly, what LS engine has 706 heads?
See all 5 photos 706 heads can be found on scores of 1999 and up GM 5.3L and 4.8L engines.
Likewise, what LS engines have cathedral port heads? Cathedral port heads came on the original (Gen III) LS1, but were also used on the performance-oriented LS2 and LS6 versions. Cathedral port heads were bolted on literally millions of truck variants, which included (among others) the 4.8L LR4, the 5.3L LM7, and 6.0L LQ4.
Keeping this in consideration, what heads came on LS1?
The LS1 heads have 67cc chambers with 2.00/1.55-inch valves. Other heads you'll run into are 852 and 706 castings, which have smaller 61cc chambers and 1.89/1.55-inch valves. These are best for high-compression builds and really need larger valves and porting work.
How do you identify 706 heads?
Typically, the cracked cylinder heads are marked 706 or 862 in the front corner under the oil filler (as shown in Figure 1). However, these casting numbers alone do not positively identify Castech heads. The only way to verify that the heads are Castech is to remove the valve cover.
Related Question Answers
Are 5.3 and 6.0 heads the same?
They will interchange without any problems. The heads have the same flow characteristics as the LS6 head. BTW, 317 heads are LQ4 low HP heads, not LQ9. You will lose compression with the 317 or 035 LQ9 heads on your truck.Are 317 LS heads good?
317 are the same as the 243/799 head but with a larger combustion chamber as you have noted. So it flows fine. But for a street car, I'd want to bump the compression. If you are running boost the 317 untouched would be a good head.Are 706 heads better than 317 heads?
While it is true that the 317 heads flow slightly more than the 706 heads, the difference in flow is minimal, and those gains are primarily at higher valve lifts. Besides, the minor flow gains required a larger intake valve, and part of the reason the 706 heads make better power than the 317 heads is the smaller valve.Is Vortec same as LS?
Although Vortec engines are "LS" based they are NOT LS engines IMO. You can gain an inch or two by removing the plastic engine cover and cutting some of the plastic tabs on top of the Vortec intake manifold. This may be all you need for clearance and a Vortec will fit in your car.What did 799 LS heads come on?
Wonder what year they started using these heads? they came on the L33HO 5.3L's and 07+ 5.3L's.Are LS heads interchangeable?
All LS cylinder heads, with the exception of the LS7 heads, are interchangeable among blocks. The LS7 cylinder heads cannot be mounted to other LS blocks, as the wider valve layout would result in valves contacting the bores.Are 4.8 and 5.3 heads the same?
4.8 and 5.3 have the same bore, only the stroke is different.Do 862 heads crack?
Yes, from incorrect torquing. Both the 706 and 862 castings are problematic. I would look into a 241 243 799 or 317 when you replace them to ensure a good casting.Can I put LS6 heads on LS1?
The LS6 heads have longer valves than the LS1 heads and together with a tighter quench height you will have a different pushrod length requirement. 4: You will need 99 or later valve covers. The 98 valve covers are perimiter bolt covers and will not fit on the LS6 heads.What stock LS heads are the best?
Like the other posted, the 243/799 LS6/LS2 heads are the way to go. If you can snag a set off of an 02+ Z06 with the lightweight valves thats a plus as well. LS1, LS6, LS2, L92 and LS3 heads will fit an LS2, L92 and LS3 block.Are LS2 and LS3 heads the same?
But, the most obvious difference between the two is the displacement. The LS2 has 6.0L of displacement, and is technically was the first Gen IV Chevrolet engine. The LS3, on the other hand, has 6.2L of displacement and is also Gen IV Chevrolet engine. To no one's surprise, the LS3 heads are better than the LS2 heads.What did LS 243 heads come on?
LS Head CastingsThe 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6's 243 heads, but had 6 cc larger combustion chambers.
What's the difference between LS1 and LS6?
As far as I can tell, the only difference between the LS1 and the LS6 is the 243 vs 241 heads (2cc smaller chambers and sodium filled valves) and the camshaft.How much HP can a LS1 handle?
The stock crankshaft can handle about 900 hp and 7,000 rpm (for a limited time). A Forged Crankshaft upgrade will add strength to the bottom end.Is a 5.3 an LS motor?
The cheapest of the LS engine family is the 5.3L truck engine since it came in most of the trucks and SUVs that Chevrolet has produced.How much HP does a 5.7 LS have?
LS Family = Gen. 3, 5.7L, Aluminum Block, Car Engines| Performance Specifications | |
|---|---|
| Compression Ratio | 10.2:1 |
| Horsepower Rating | 305-350 hp |
| Torque Rating | 335-365 ft./lbs |
How much horsepower does a 5.7 LS1 have?
The LS1 was initially introduced in the 1997 Chevrolet Corvette C5, in which it was rated at 345 horsepower (257 kW) at 5,600 rpm and 350 pound-feet of torque (470 Nm) at 4,400 rpm.GM 5.7 Liter V8 Small Block LS1 Engine.
| Displacement: | 5.7L / 346 cu. in. |
|---|---|
| Aspiration: | Natural |
| Introduced: | 1997 model year |
| Discontinued: | 2005 |
