Lq4 build
12-25-2018, 04:24 PM
#1
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Lq4 build So I just purchased a lq4 motor and also this is all new to me. So I really need help on figuring out what all I should do to build this motor. What cam? Heads? Currently 317 heads. Pistons & rods? Lifters & push rods? And so on any one that can help me I’d greatly appreciate it
12-26-2018, 08:57 PM
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Last edited by Joe Zambrano; 12-26-2018 at 09:03 PM.
12-29-2018, 04:16 PM
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but if I kept the 317 heads would they still be robbing power? If I got those dome pistons
12-31-2018, 09:03 AM
#6
The 317 heads would work well but you can get more power with a different head with smaller chambers. 243/799 castings would be good with 64cc chambers, that would get you to about 11.8:1. I will probably use a 862 head and mill it down for about 13:1, but I plan to use E85 instead of 93 octane gasoline.
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01-04-2019, 07:52 AM
#8
The ports are essentially the same so it really just comes down to chamber size. The 317’s are at about 71cc so they’ll lower the compression ratio which helps for boosted applications. The 799/243 castings are about 64cc so they raise the conpression.
Last edited by KCS; 01-04-2019 at 08:26 AM.
01-04-2019, 02:06 PM
#9
TECH Apprentice
You can build a nice street engine with a stock LQ4 short block. There are a lot of guys running stock junkyard LQ4/LQ9 short blocks with high miles -- with turbos and nitrous. They are pretty stout. If you are on a budget n/a build and the short block is in decent shape you could just clean it up and add a set of used 243 heads and an LS6 intake, or a set of used LS3 heads and an LS3 intake, and a cam. That would get you a pretty strong street set up for not too much cash.