With the noted exception of the early LQ4 engine, all LS engines have aluminum cylinder heads. The LS2 and L76 are noteworthy in that they are both Gen IV 6.0L aluminum block engines, and that they came from the factory in both cars and trucks.
What did the aluminum 5.3 come in?
The L33 was introduced in 2005 as the “High Performance” 5.3L engine. It was only available in the 1/2 ton, 4WD, extended cab Silverado and Sierra until 2007.
Are all LS heads aluminum?
All LS passenger-car blocks are aluminum and most truck powerplants use an iron block, although there are several exceptions with aluminum truck blocks. Iron blocks allow larger overbores but add roughly 100 pounds to overall weight.
How do I know if my 5.3 is aluminum?
Look at the VIN# and if the 8th digit is a 3, you have the aluminum block, if it is a 0 it is iron.
Are 5.3 and 6.0 heads interchangeable?
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.
What LS heads flow the best?
See all 18 photos After all the measurements were taken, each head was placed on the flow bench for flow data. Not surprisingly, the 799 heads flowed the most, with a peak flow of 250.2 cfm at 0.700-inch lift. The 706 heads offered the lowest peak flow, checking in with a maximum of 237.1 cfm.
Are all LS rockers the same?
Even though most of the LS1 or GEN III rocker arm ratios are the same, not all cylinder heads are the same. … Don’t forget that LS1/LS6 and LS2 intake and exhaust rockers are interchangeable, but the LS3, LS9 and L92 intake rockers are offset.
How much HP can a 5.3 LS make?
The stock 5.3L is factory rated around 320 hp with 340 lb-ft of torque. Most people will tell you 500-550 rwhp is a reasonably safe limit to push a stock bottom end.
Is the 5.3 L Vortec a good engine?
The 5.3L V8 Vortec 5300 is considered an engine that is extremely reliable. In fact, many vehicle owners with the engine report having the engine run with minimal issues up to 220k miles. Additionally, the engine blocks are very durable also.