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Help me pick a cam- Lq4 build

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Old 12-10-2013, 11:05 PM
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doesnt seem to bad..is 6400 rpm and 40-50 hp all im really gonna expect? I guess i was thinking a little bigger than that. I would rather error on the side of too big than to small..i will have the fuel system, exhaust, intake etc for whatever it takes. I have a pretty decent budget, but i dont want to be 3k into a heads/cam motor when I can pick up a used blower for not much more and go that route, with supporting mods of course

Whats wrong with something like this? Running a 3800-4k stall? Im new to the whole cam selection, so bare with me. For something that im building to be fast and fun to drive, why not go bigger? Will it just require to big of a stall and really suck that bad to drive around town?

http://www.texas-speed.com/p-1152-te...-camshaft.aspx
http://www.youtube.com/watch?v=Xb8LmAwsQE4
http://www.youtube.com/watch?v=vKz7fywnW1Q

This may be something of a compromise?
http://www.texas-speed.com/p-1154-te...-camshaft.aspx

Last edited by nickleahy23; 12-10-2013 at 11:22 PM.
Old 01-03-2014, 01:57 PM
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Alright well heres where im at so far. Let me know what you think good/bad- reminder this is for my RCSB 4x4 4200 lbs

Bought-
Heads- 799s- currently milled .005(so i was told, can the machine shop verify so I get the right amount milled?) might mill another .025 to get compression to 11:1 (from what I read)
Intake- TBSS
TB- 92mm Billet Cable driven

Not bought yet
Motor- Lq4 (2003+ most likely)
Cam-233/239 .595/.603 112 from TSP.
Injectors- Not sure now with TBSS intake, need to research. Stock TB are 32 lbs, so i will defiantly need to upgrade
Springs- .650 double spring
Pushrods- Depends on what I mill, have a pushrod length checker at home
Ls7 Lifters and trays
Ls2 Timing Chain
Walboro 400 Fuel Pump
LS1 fuel filter/regulator for my return style fuel system

Misc gaskets and such.

Trans-
4l80e swap, hd2 **** kit, 3200-3600 converter


Hows that sound? Should be a pretty healthy NA 6.0. Id like to go FI down the road, but i will worry about that when the time comes.

Last edited by nickleahy23; 01-04-2014 at 01:40 PM.
Old 01-03-2014, 04:03 PM
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That'll be healthy for sure!

Not that you wont be able to go FI... but if this were an FI build I think a lot of those parts would be different. The cam obviously... but compression is a bit high too. Again, it can be done no problem, but it would be better if it were more purpose built for boost.

As far as converter choice... i have a feeling if you go to boost youre gonna wanna go to an 80e also. Thats going to be a lot of power and a lot of weight for that 60e
Old 01-04-2014, 06:17 AM
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this is the cam martin at tick suggested to me for my lq4. current mods are in my sig. i told him i want a cam that will not kill my spring life and over work my lifters since its a daily driver and i'm replacing lifters with my current setup on XER lobs. i love to hear the cam too.

229/232 .615"/.575" 114+3

might work for your truck too

sorry, i just seen you compression goal. this might not be the best with that much compression.
Old 01-04-2014, 01:39 PM
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Originally Posted by Vortec350ss
That'll be healthy for sure!

Not that you wont be able to go FI... but if this were an FI build I think a lot of those parts would be different. The cam obviously... but compression is a bit high too. Again, it can be done no problem, but it would be better if it were more purpose built for boost.

As far as converter choice... i have a feeling if you go to boost youre gonna wanna go to an 80e also. Thats going to be a lot of power and a lot of weight for that 60e
Im really building it for NA..for now..I have no "real" plans to go FI, but we will see what happens. I will keep my stock heads and everything so I can always swap out parts and sell NA parts if the time comes.

Forgot to mention the trans.
a 4l80e is the plan with a hd2 shift kit. conveter will be 3600 most likely

Last edited by nickleahy23; 01-04-2014 at 01:52 PM.
Old 01-04-2014, 01:46 PM
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Originally Posted by nickleahy23
a 4l80e is the plan with a hd2 **** kit. conveter will be 3600 most likely
Sorry... I had to

That being said... look into the sonnax kits. They have a much better boost valve that it will include that most tranny builders use in their built units.

Another note... if you are thinking 80e give Chuck at FLT a call. Do it right the first time... take it from someone who DIDNT and wasted a ton of time dancing around. I finally caved and couldn't be happier that I did.
Old 01-04-2014, 02:00 PM
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Originally Posted by tashspop
this is the cam martin at tick suggested to me for my lq4. current mods are in my sig. i told him i want a cam that will not kill my spring life and over work my lifters since its a daily driver and i'm replacing lifters with my current setup on XER lobs. i love to hear the cam too.

229/232 .615"/.575" 114+3

might work for your truck too

sorry, i just seen you compression goal. this might not be the best with that much compression.
im not sure if i will even mill them or not..I think ill be at 10.5:1 as it sits now..well see

This isnt a daily, so i will likely go bigger on the cam
Old 02-14-2014, 01:07 PM
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another question for you guys, if i pick up a LQ9 vs a LQ4, am i going to have to change anything? I know the pistons are flat top vs dished but that's about the main difference. Can I still run my 243 heads and the same cam I was thinking of? I know compression will be a bit higher with the flat top pistons, but im not against that. its looking like id be just below 11:1 with my .005 milled 799s.

Do I have to worry about valve clearance with the flat top pistons? My cam is right around .600 max lift, so im thinking it should be alright?

reason I ask, I can get low mile LQ9s for 1000-1200 and LQ4 all of the sudden are 1400 or so...

Last edited by nickleahy23; 02-14-2014 at 02:50 PM.
Old 02-14-2014, 03:08 PM
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I dont know the answer to your question, but max lift is not a good indicator of if you will have PTV clearance problems. It has everything to do with the ramp rate of the valve since closests contact is usually 10-15 degrees ATDC which is far below max valve.
Old 02-14-2014, 03:32 PM
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Originally Posted by Atomic
I dont know the answer to your question, but max lift is not a good indicator of if you will have PTV clearance problems. It has everything to do with the ramp rate of the valve since closests contact is usually 10-15 degrees ATDC which is far below max valve.
Good call on that. Thanks. I was reading in a few threads that i should be alright with 243s not milled and my cam, but if i kept the 317s i may run into trouble with the PTV clearance with a higher lift cam. I will have to get some more info. Might end up giving Pat G a call to make sure I end up with a cam that will work without issue.
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