243 heads on lq4
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From: Moreno valley
243 heads on lq4 Hey guys first time "forumer". I got a 94 obs getting swapped with an lq4. My plans are to go with tbss intake, btr stage 2 LS cam (227/234), with 243 heads milled to 62cc. Am I correct to assume the 7.4 pushrods will not work. Will I have any other issues?
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From: Moreno valley
Measuring is going to be done, for good measure.just wondering if from experience or knowledge of this combo of anyone thinks or has run into those or other issues.
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From: Moreno valley
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I have forgotten how much to mill 243's to lose 3cc's, but .020 sounds close.
Plus get .045 gaskets to bring the quench more in line, and you are at .025 less height.
So yeah, a 7.375 pushrod would be right. But it's good to measure to be sure.
Plus get .045 gaskets to bring the quench more in line, and you are at .025 less height.
So yeah, a 7.375 pushrod would be right. But it's good to measure to be sure.
I agree
To add to it, it will depend what lifters are used too. OE lifters have a .200 plunger travel and are usually set around .060 pre load, so if you put .025 more in there's still plenty of room there. IMO
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That's good to know! I did not realize there was so much travel! .025 is nothing within .200 range of travel...
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Teching In
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From: Moreno valley
I wasn't aware I would need new lifters. I did read about the trunion upgrade but didn't see much on this. Any recommendations, honestly don't know much when it comes to lifters.
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From: Central Cal.
If the old lifters have a lot of miles on them, it is a good idea to replace them. But you might not need to. With roller lifters there is no break-in like with flat tappets.
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From: Moreno valley
Oh that's nice to know, so in theory I can buy new lifters for some reassurance and not have to break-in
Exactly.
For your typical heads cam type build Johnson 2110 are the crowd favorite around here.
Thompson Motorsports has some made for them that people have said are great
Morel lifters are supposed to be considerably better than the LS7 lifters and are basically the same price. (I believe those are the 6504 part number?)
If I remember right summit racing has some they get made for them too that are supposed to outperform the standard LS1 lifter but I can't recall 100% on that one, maybe someone can chime in on that.
If you're looking for lifters get with some of the site sponsors on the sponsor menu to the right of your screen.
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From: Moreno valley
Exactly.
For your typical heads cam type build Johnson 2110 are the crowd favorite around here.
Thompson Motorsports has some made for them that people have said are great
Morel lifters are supposed to be considerably better than the LS7 lifters and are basically the same price. (I believe those are the 6504 part number?)
If I remember right summit racing has some they get made for them too that are supposed to outperform the standard LS1 lifter but I can't recall 100% on that one, maybe someone can chime in on that.
If you're looking for lifters get with some of the site sponsors on the sponsor menu to the right of your screen.
For your typical heads cam type build Johnson 2110 are the crowd favorite around here.
Thompson Motorsports has some made for them that people have said are great
Morel lifters are supposed to be considerably better than the LS7 lifters and are basically the same price. (I believe those are the 6504 part number?)
If I remember right summit racing has some they get made for them too that are supposed to outperform the standard LS1 lifter but I can't recall 100% on that one, maybe someone can chime in on that.
If you're looking for lifters get with some of the site sponsors on the sponsor menu to the right of your screen.
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For that cam in a 94 OBS, you're going to want a minimum of a 3,000 rpm stall converter. You'll likely want some 3:73+ gears as well.
Regarding lifters. Our SUM-HT214-16 lifters are LS7 spec. They have .165" travel, and we recommend .060-.080" preload. We're comfortable with them being used with 420 lbs. open spring pressure and to 7,000 rpm. We've had customers exceed those numbers but it isn't something we recommend.
Regarding lifters. Our SUM-HT214-16 lifters are LS7 spec. They have .165" travel, and we recommend .060-.080" preload. We're comfortable with them being used with 420 lbs. open spring pressure and to 7,000 rpm. We've had customers exceed those numbers but it isn't something we recommend.
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From: Moreno valley
For that cam in a 94 OBS, you're going to want a minimum of a 3,000 rpm stall converter. You'll likely want some 3:73+ gears as well.
Regarding lifters. Our SUM-HT214-16 lifters are LS7 spec. They have .165" travel, and we recommend .060-.080" preload. We're comfortable with them being used with 420 lbs. open spring pressure and to 7,000 rpm. We've had customers exceed those numbers but it isn't something we recommend.
Regarding lifters. Our SUM-HT214-16 lifters are LS7 spec. They have .165" travel, and we recommend .060-.080" preload. We're comfortable with them being used with 420 lbs. open spring pressure and to 7,000 rpm. We've had customers exceed those numbers but it isn't something we recommend.
You don't need to go that small on the cam to have torque with a 6.0, especially with a 3000+ stall. The stall will help out a TON, so will the 3.73s. I'd probably do a 225/230 600/600 112 ISH cam, or the cam you originally posted. I'd also consider a little bit more stall too.
Otherwise your plans sound great, I'd do the ws6store .045 heagaskets since they cost basically the same as stock gaskets, will increase compression just a little and tighten up quench which is win win win.
Is this a regular cab or extended?
Is it really heavy or stock and pulled some weight off it?
Will it ever tow?
Is it a daily or a weekend toy?
What size tires will you be running on it?
What transmission will you be using?
Otherwise your plans sound great, I'd do the ws6store .045 heagaskets since they cost basically the same as stock gaskets, will increase compression just a little and tighten up quench which is win win win.
Is this a regular cab or extended?
Is it really heavy or stock and pulled some weight off it?
Will it ever tow?
Is it a daily or a weekend toy?
What size tires will you be running on it?
What transmission will you be using?
Thread Starter
Teching In
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From: Moreno valley
You don't need to go that small on the cam to have torque with a 6.0, especially with a 3000+ stall. The stall will help out a TON, so will the 3.73s. I'd probably do a 225/230 600/600 112 ISH cam, or the cam you originally posted. I'd also consider a little bit more stall too.
Otherwise your plans sound great, I'd do the ws6store .045 heagaskets since they cost basically the same as stock gaskets, will increase compression just a little and tighten up quench which is win win win.
Is this a regular cab or extended?
Is it really heavy or stock and pulled some weight off it?
Will it ever tow?
Is it a daily or a weekend toy?
What size tires will you be running on it?
What transmission will you be using?
Otherwise your plans sound great, I'd do the ws6store .045 heagaskets since they cost basically the same as stock gaskets, will increase compression just a little and tighten up quench which is win win win.
Is this a regular cab or extended?
Is it really heavy or stock and pulled some weight off it?
Will it ever tow?
Is it a daily or a weekend toy?
What size tires will you be running on it?
What transmission will you be using?
With milled 243s to 62cc and the smaller gasket what compression do you think I would be at?
It's a single cab, stock for the most part besides my sound system and my suspension for my current 7/10 drop. I won't tow or haul much if ever besides a couple of cases of beer 😜
This is my everyday daily, RN I have 20s do plan on running a 22/24 combo in the future. Tranny is going to be a 4l80e.
Last edited by Pachuco SCT; Aug 11, 2020 at 04:33 PM.
Oh okay... fecking california. Yeah you'll need to keep valve overlap down to keep the chop down, you can also turn the idle speed up some to get rid of some of it and run quiet mufflers.
With your specific needs I would recommend calling Cam Motion and have a custom cam designed/cut just for you. That way you are most likely to be fully satisfied.
With the 243's at 62 cc and a stock gasket you'll be at 10.5, with the .045 gasket you'll be at 10.7:1
And on the setup of the truck.. I asked because if the truck is a toy I was gonna recommend more cam and more converter. But I didn't realize you were in california. Your over all plan sounds really good.
Since you are going with 24's on the rear I imagine you'll be running at least a 30-31" diameter tire, so you may also look into 4.10 gears (or 4.11) whichever they make for your rear end.
With your specific needs I would recommend calling Cam Motion and have a custom cam designed/cut just for you. That way you are most likely to be fully satisfied.
With the 243's at 62 cc and a stock gasket you'll be at 10.5, with the .045 gasket you'll be at 10.7:1
And on the setup of the truck.. I asked because if the truck is a toy I was gonna recommend more cam and more converter. But I didn't realize you were in california. Your over all plan sounds really good.
Since you are going with 24's on the rear I imagine you'll be running at least a 30-31" diameter tire, so you may also look into 4.10 gears (or 4.11) whichever they make for your rear end.
Thread Starter
Teching In
Joined: Aug 2020
Posts: 22
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From: Moreno valley
Oh okay... fecking california. Yeah you'll need to keep valve overlap down to keep the chop down, you can also turn the idle speed up some to get rid of some of it and run quiet mufflers.
With your specific needs I would recommend calling Cam Motion and have a custom cam designed/cut just for you. That way you are most likely to be fully satisfied.
With the 243's at 62 cc and a stock gasket you'll be at 10.5, with the .045 gasket you'll be at 10.7:1
And on the setup of the truck.. I asked because if the truck is a toy I was gonna recommend more cam and more converter. But I didn't realize you were in california. Your over all plan sounds really good.
Since you are going with 24's on the rear I imagine you'll be running at least a 30-31" diameter tire, so you may also look into 4.10 gears (or 4.11) whichever they make for your rear end.
With your specific needs I would recommend calling Cam Motion and have a custom cam designed/cut just for you. That way you are most likely to be fully satisfied.
With the 243's at 62 cc and a stock gasket you'll be at 10.5, with the .045 gasket you'll be at 10.7:1
And on the setup of the truck.. I asked because if the truck is a toy I was gonna recommend more cam and more converter. But I didn't realize you were in california. Your over all plan sounds really good.
Since you are going with 24's on the rear I imagine you'll be running at least a 30-31" diameter tire, so you may also look into 4.10 gears (or 4.11) whichever they make for your rear end.
I was reading somewhere that a smaller cam(in 211-219 duration range) with say 112 lsa will chop less than a (in 220-229 duration range) with the same lsa. That's why I had the idea of maybe going with the stage 4 223/226 that comes with 111lsa that I can get grinded for a wider lsa for $15 more. I was told that as well that I can increase idle speed some to get rid of some chop. I had bought some straight thru design mufflers that I probably won't run depending on sound once the cam is installed.
I will check into a custom grind as well now that you mentioned it.
Do you think with 10.7:1 I would be good on 91...
I get you, if it wasn't my daily I would go big cam and say screw the laws but since I drive my truck on a daily basis it may not be my smartest idea lol. I hope to break or if not atleast come close to 400whp!
And 31in sounds about right, I'm at 27in with my 20s RN.
i did plan on going 4.10 once I get the custom wheels done but that won't be soon somewhere down the rode.
Last edited by Pachuco SCT; Aug 11, 2020 at 05:34 PM.