L33 5.3 build fast intake question
07-31-2009, 06:43 PM
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L33 5.3 build fast intake question I am about to put together a L33 5.3 I am going to have to replace the truck manifold anyways i was considering just going LS6 intake manifold but if I can make more power with a fast 92/92 setup I have seen a few good deals on some used setups, but will it be to much air? or if it will make good power should I go with a different cam?
08-01-2009, 10:31 PM
#4
Well stock LS-6 heads have a combustion chamber 64.45 cc and 2.00 intake valves.The 5.3 heads have a smaller combustion chamber 61 cc and 1.89 intake valves.I do'nt know what your goal is as far as compression ratio ,but the LS-6 heads will lower it a bit.Now there is a LS-6 cnc race version that has a 62cc chamber I believe.The 5.3 heads can be machined up to 2.02 on the intake and 1.57 on the exhaust.This is the way I am going to go with my L33 when I get around to mine someday,unless something better comes along in the mean time.There is a thread here that has good head info lol,search casting # heads.
08-16-2009, 06:16 PM
#6
Have you been able to find anyone to port your heads,are you going with larger valves,surely there is a good shop in Michigan that can do this, If not check out WCCH they can do a great job with these heads,. they are a sponser here.As far as the intake if your going with ported heads you could benifit from the Fast 92 intake,but you cant go wrong with the LS-6 intake.Bang for your buck the LS-6 is the better buy,the best price I have seen on a Fast 92 is 800 new on ebay that included shipping.So unless you can find a great deal on a used one ,I would go with the LS-6.That cam your going with, is that Thunder Racing with .563 lift?Sounds like you got a good plan for build,that will be a wicked ride when its done !WHat engine computer /controller are you going to use?
08-17-2009, 08:27 AM
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I am looking for a f body engine/transmission harness, and a stock ls1 computer that I will have the vats removed from and have it tuned. All the good Lsx shops around here are closed. I am going to have Hinson super cars modify my harness with a OBD-II port so my SES light will work. I hope I can make about 300 hp to the wheels with this combination.
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08-17-2009, 04:03 PM
#8
Well you should not have any problem meeting your hp goal,especially if good head work is done.There is a 5.3 build similar to what we are talking about in CAR CRAFT mag Apirl 2008.Its easy to get close to 100hp gain with just headers,cam swap and a good intake.there is a guy on here ,that had a Ls-1 RX-7,go to www.wrongmotor.com there is a clip of it on there.Im curious how much money do estimate your build will cost,just the engine alone?
08-17-2009, 04:28 PM
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Nice setup. I'm currently working on my project too which consists of a 1997 Nissan 240sx with a 2005 L33 and T56. I would definitely like to see how your numbers compare, I didn't have the coin left over to port in polish my heads (local race shop around here wanted $600) and my ride is a budget build so I have the Z06 cam and springs with a LS1 intake I picked up for $35. Of course the L33 does have the LS6 heads and higher compression stock so hopefully it will still put a smile on my face.
I'm still at almost 6 grand for my build, but what can you do.
I'm still at almost 6 grand for my build, but what can you do.
08-18-2009, 11:51 AM
#10
L-33 casting number Hey that 240 w/ T56, that's got to be a lightweight,do you have any idea what its going to weigh finished?Whats been your biggest expenses so far on this conversion?Sounds like you stole that intake and cam ,you can still get a Ls-6 valve spring kit new in the 60 dollar range ,I believe there good up to .570 lift.Now thats a good buy value wise,If those springs are not fresh,I would replace them with new ones for less than 60.Am I reading your post right that you installed Ls-6 heads or it came with Ls-6 heads?Let me know what casting # is on your heads ,very curious to know,and I'm going to check mine. Maybe V8envy can tell us what his Casting # is also.
08-19-2009, 07:19 PM
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I have two motors one with 799 and one with 243 which are better? I am on a budget as well so I don't know how soon I will be done but want to start putting the motor together, for the price difference I am going to just use a plain old ls1 intake for now, spend a few dollars on a used tr220 112lsa cam, I think I can get more power for the money with the cam, I am going to have the heads ported 799's or 243's I don.t know yet, I will use after market valve springs 28.8 injectors and stock ported throttle body, I hope to see 325 to the wheels?? 
08-22-2009, 03:02 PM
#13
The two L-33 motors you have,what mileage and condition are they in,and how much did you pay for them?My L-33 motor is from a 07 classic style Sierra with 4K on it,the head casting#is 799.Yes ,these heads both the 243 and the 799 could be called LS-6 or LS-2 heads.LS-2 is probably a better name,because I don't believe the L-33 version got the hollow stem intake and sodium filled exhaust valves like the Z06 vettes.Most Z06 vettes got the 243 but some 2006 vettes early production, received the the 799 too,and some rare reports in later dates also.Some of the vette owners are pissed to find that they have 799 castings,they feel cheated.There are pages on this topic in corvette forum.But the two castings are virtually the same,the 799 is not as smooth the 243s. I have not read where, any one expert has tested these in big numbers to determine which head is better.If your going to port these heads ,there is no difference in these heads they clean up the same under a cnc program.But in stock form you make want to go with the 243s to be in with corvette crowd.
08-22-2009, 09:48 PM
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from what I understand they came out of an 05 and an 06 extended cab chevy both vin b one had 37k and the other 56k I actually paid more for the one with higher mileage I got the one with 56k for 500 but scored a deal recently for the 37k mile one for 420 shipped
08-23-2009, 08:29 PM
#15
Yeah, the L-33 was only available in Ext cab 4x4s ,and only 25% of trucks in 2005 had the L-33.My 07 L-33 is also a vin B,the other thing I like is that even thou mine is 2007 it still has a 24x reluctor wheel.Well I thought I got a good buy on mine and still do ,but 420 shipped for a 30k L-33 .Now that's a grrrrrreat buy ,think about it the technology of this engine,an aluminum block,good heads,almost 10:1 compression, and a factory rated 310hp to start with that's a good foundation to build from, for 420 dollars.When you compare this with what alot of old LS-1s from f-bodys go for 1k to 2grand with up 100k on them,this is a no brainer IMO, the only thing given up is 21 cubic inchs.Were there any broken or missing parts,not that it matters because it not going in a truck,but you could sell the truck parts that you take off.Back to heads question comparison I read somewhere that a guy tested both 799 and 243, and he saw a very slight gain in flow # with 243s but there was no detail on the flow test ,nothing to get excited about.Some vette guys think the 243s are worth 5 to 10hp more, but I don't think there is any solid proof of this, if there is I would like to know.
08-24-2009, 08:43 AM
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yeah the L33 is the best bang for the buck bargain in the Ls family. both mine came complete intake to oil pan minus front accessories, which I need f body drive accessories anyways. I can't wait to get this thing together, I got a tr224 cam 112 lsa, I got a ls6 intake, stock fuel rail with 28.8 injectors, I still nees an f-body wiring harness but from what I understand everything will plug right in, I just need to get the vats removed and a good tune with the cam. similar combos in automatic trucks have put down 360 whp
