![]() 030 to figure out how many CC's that removes you take. You can also do the reverse, say you want to mill a head. So to get your 66cc chambers down to 63cc you'd have to mill ~.021. You have a stock 66cc chamber and you want to get down to 63cc 007" milling to remove 1cc from an LS1 head 005" milling of the block deck to remove 1cc of volume. So you want to figure out how much to mill: Swapping on the LQ4 head drops the compression ratio of a typical LS1 engine to 9:5.1 They offer a large combustion chamber that lowers compression ratio making them perfect for a forced induction application. This is the workhorse head for street / strip turbo and blower cars. All other features are the same as previous years iron heads. The LQ4 head received aluminum heads starting in models year 2001. Because of the smaller intake valve installed in these heads a valve upgrade is practically mandatory.Ĭompression Ratio: 10:1 LQ9 Flat top pistonsĬhamber 71.06cc-0.100-0.200-0.300-0.400-0.500-0.550-0.600 This along with milling of the deck surface will allow a slightly higher compression ratio to be achieved. These small combustion chamber truck heads offer no advantage over an LS1 head except the smaller combustion chamber. LS6 heads are the best choice only when all-out power is needed. ![]() ![]() The exhaust port is a unique D-shape that improves flow. ![]() And because less timing allows more efficient combustion, the Ls6 heads allow the engine to produce more torque. The more efficient design shortens burn times and ultimately means less ignition timing advance is required to produce the same power. At 65cc, the combustion chamber is slightly smaller and more efficient than the LS1. The LS6 cylinder heads is essentially a tuned-up version of the LS1 head. 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 in 1997, most notably a switch from perimeter to center valvcover bolt configuration for the 1999 model year. The standard issue LS1 heads is best all-around head for the street / strip engines. Here is a list of a known production casting #'s:Ģ41 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 castings)Ģ43 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications***ħ99 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Headsģ17 01 and up LQ4 and LQ9 6.0 aluminum center bolt headsĠ35 01 - 04 LQ9 6.0 aluminum center bolt headsĬhamber 66.67 cc-0.100-0.200-0.300-0.400-0.500-0.550-0.600 How ever, They need to be matched up with the proper engine combo to see any gains.
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