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383 Cam recomendation

Post questions and answers about your engine problems.. What is this ticking sound I hear while starting? Engine not turning over? Problems with your battery... alternator? Find out here.

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maxg1989
Posted: Sat Nov 07, 2009 1:27 pm
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In the middle of building a 383 stroker lt1. I have the stroker kit and most of the parts already just looking for a cam, what do you guys recommend?

Heres what it will have in it

Edlerbrock Lt4 intake
Gm Lt4 heads
Harland Sharp 1.6:1 rr's
Lt headers soon
58mm throttle body
^ all the important stuff.
ect ect ect...

Will be in my daily driver for the summer so i want a cam thats not stupid crazy lopy, with a nice idle that is noticable. and still gives it hell when you step on it.

Here is what comp cams recommended. http://www.summitracing.com/parts.aspx?sku=CCA-07-468-8


Thanks
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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roughskinjrz
Posted: Mon Nov 09, 2009 2:28 pm
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thats a pretty decent cam. 113 lobe seperation and 242/248 duration so it will not have crazy lump idle to it, but you will know its there definitely. putting 1.6 rr's on it to will bring the life over .600" on intake and exhaust. you will need headers, and preferably 373s or higher, and a stall converter of about 3000.
'74 454 .030 Over 4.250 Stroke 489, SRP Forged 0.030 Flat Tops, Crane Z Blower .632/.632 244/256 Cam, Weiand 871 Roots Blower, 2 x 800cfm Barry Grant Speed Demon Carb, Procomp 320cc Heads Race Package, CSR Electric Water Pump, TH400 FUll Manual Reverse Valve Body Sportsman Trans Brake 3000 Stall, 9" Rearend 31 Spline 3.70 Gears.
 

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maxg1989
Posted: Mon Nov 09, 2009 6:25 pm
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roughskinjrz wrote:
thats a pretty decent cam. 113 lobe seperation and 242/248 duration so it will not have crazy lump idle to it, but you will know its there definitely. putting 1.6 rr's on it to will bring the life over .600" on intake and exhaust. you will need headers, and preferably 373s or higher, and a stall converter of about 3000.



Gears and headers are probably going to have to wait for the cash flow :( but it would be a heck of a lot easier to just put the new motor in whith the headers too.

Why does the rear end gear make a diff in the cam?? i have never been able to figure that out ?
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Wed Nov 11, 2009 11:02 am
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That is a huge cam for a daily driver depending on what you are used too..
But I would use that or something similar..

That drivability of that cam will totally rely on the tuner..
And that is where and why you have to consult with who ever is tuning the car..
That is definitely a set up that will require having a real tuner compared to a mail order tune..
With out any of that you are in limbo because the stock programming will not be sufficient enough to run the engine...

The reason for the lower gear ratio is because of the power band of that cam and for it to perform as efficient as possible or to get the best results out of will require a lower gear ratio IMO since you have a 6 speed it would be 3:90 or 4:10's...
But that can be added later...
How ever
Using stock exhaust manifolds on that set up is going to choke it off and adding headers later on might require a 2nd tuning with a tuner...
So keep all of that in mind because depending on the tuner you may be paying them again and again to make changes for you...
So you might not be saving any money by not doing the modifications now
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maxg1989
Posted: Wed Nov 11, 2009 1:08 pm
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i will be tuning the car with tunercats. I was also told by a GM performance parts employee, that all i would have to do is just get a fuel pressure regulator and turn up the psi and i would be fine. This guy was paid by Gm to race Several LT1 camaro for year and also hasbuilt many 383 Lt1s for them. He said Trust me everyone make is harder then it needs to be. Dont know if he is crazy but i almost have to trust him, since he has real world paid experience with it...
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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maxg1989
Posted: Wed Nov 11, 2009 1:09 pm
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But would you recommend that cam or something like one step down?
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Wed Nov 11, 2009 5:12 pm
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Camshaft choice sounds fine to me..

To me it sounds like the guy is blowing smoke up your A$$ and full of $HIT
Sorry but considering all of the parameters that these engines run off of..
Just bumping up the fuel like you are dealing with a SBC is a bad move..
You are dealing with situation where you are stroking the engine, increasing air flow with the intake, heads and ect..
Just increasing the amount of fuel being fed to the engine is not going to cut it..
Just about every single parameter in the pcm is going to have to be changed...
There is VE, MAF , FUEL, Fueling calibration for different injectors , ect,ect all in that little pcm and every single one of those tables
matter when it comes to engine management...


You want the car tuned with a Wide Band O2 system to verify the correct air/fuel ratio...
If you do not know what that is then I suggest that you look it up...
If you want the best possible performance you also want some one experienced with LT-1's to tune it unless you want to gamble on how long your engine will last..
Believe who you want to believe it is your engine not mine there for I do not care and I can only warn you..
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maxg1989
Posted: Wed Nov 11, 2009 5:19 pm
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OH no i agree totally! I plan on getting a Wideband O2 meter in my car so that i can tune it as i go. I know plenty of people that can get me access to a dyno and help me tune it as well. I would like to get it professonally tuned that that seeems to be way to damn much in my opinion.
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Wed Nov 11, 2009 5:23 pm
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$4-500 for tuning on an engine with 1,000's invested in to it???
To get the most horse power , with the best mileage on the safest Air fuel ratio and engine running condition??

Sorry I do not think so...

There is a reason most shops have a tuner and a mechanic and they usually rarely do both...
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maxg1989
Posted: Wed Nov 11, 2009 6:23 pm
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So what can happen if its not tuned right? And say it has a safe A/F ratio.
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Wed Nov 11, 2009 6:36 pm
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maxg1989 wrote:
So what can happen if its not tuned right? And say it has a safe A/F ratio.

If you have to ask this question You really shouldn't be messing with such things..
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maxg1989
Posted: Wed Nov 11, 2009 6:59 pm
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Besides buring up pistons from being to lean, what could you do. Its not much different from Chainging timing on a distributor and richening and leaning up a carb. I guess i dont see how its that much different from an older sbc. It still runs on gas and air mixture..... Just getting those right at the right RPMs and making changes for Displacement and Compretion Ratio, What could you do ?
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Wed Nov 11, 2009 7:31 pm
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maxg1989 wrote:
Besides buring up pistons from being to lean, what could you do. Its not much different from Chainging timing on a distributor and richening and leaning up a carb. I guess i dont see how its that much different from an older sbc. It still runs on gas and air mixture..... Just getting those right at the right RPMs and making changes for Displacement and Compretion Ratio, What could you do ?


And what parameters are you going to adjust and recalibrate for that huh??
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ib4200
Posted: Wed Nov 11, 2009 7:44 pm
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owned.
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maxg1989
Posted: Wed Nov 11, 2009 9:25 pm
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ins0mnia24 wrote:
maxg1989 wrote:
Besides buring up pistons from being to lean, what could you do. Its not much different from Chainging timing on a distributor and richening and leaning up a carb. I guess i dont see how its that much different from an older sbc. It still runs on gas and air mixture..... Just getting those right at the right RPMs and making changes for Displacement and Compretion Ratio, What could you do ?


And what parameters are you going to adjust and recalibrate for that huh??


Well first im guessing that you would have to change the fuel curve to get it more gas for the bigger displacement or it will be starving it self, and also adjust for bigger injectors. And adjust the timing curve giving it more timing advance. And do this for all rpm ranges Tryin to stay as close to 14.7 afr at idle to part throttle, and 13.4 afr for WOT keeping it a little richer. . Look im not trying to argue about anything, im just trying to get some advice here hence the reason for this Forum .
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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roughskinjrz
Posted: Wed Nov 11, 2009 10:28 pm
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the cam is pretty good for street use, but you'd love the sound. but its not all about sound. you must have the rest of the engine/drivetrain components to go with it or just putting in a big cam could make the vehicle run worse. having high flowing heads, and intake as well as tune with the fuel injection. a stall converter to where the RPM range for the camshaft/engine is and the rear gear ratio like which was stated above to keep the engine in the rpm range.
'74 454 .030 Over 4.250 Stroke 489, SRP Forged 0.030 Flat Tops, Crane Z Blower .632/.632 244/256 Cam, Weiand 871 Roots Blower, 2 x 800cfm Barry Grant Speed Demon Carb, Procomp 320cc Heads Race Package, CSR Electric Water Pump, TH400 FUll Manual Reverse Valve Body Sportsman Trans Brake 3000 Stall, 9" Rearend 31 Spline 3.70 Gears.
 

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maxg1989
Posted: Thu Nov 12, 2009 5:26 am
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The motor is a complete build up so its going to get everything it need to run well, If not right now in the future.
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Thu Nov 12, 2009 1:10 pm
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maxg1989 wrote:
ins0mnia24 wrote:
maxg1989 wrote:
Besides buring up pistons from being to lean, what could you do. Its not much different from Chainging timing on a distributor and richening and leaning up a carb. I guess i dont see how its that much different from an older sbc. It still runs on gas and air mixture..... Just getting those right at the right RPMs and making changes for Displacement and Compretion Ratio, What could you do ?


And what parameters are you going to adjust and recalibrate for that huh??


Well first im guessing that you would have to change the fuel curve to get it more gas for the bigger displacement or it will be starving it self, and also adjust for bigger injectors. And adjust the timing curve giving it more timing advance. And do this for all rpm ranges Tryin to stay as close to 14.7 afr at idle to part throttle, and 13.4 afr for WOT keeping it a little richer. . Look im not trying to argue about anything, im just trying to get some advice here hence the reason for this Forum .



Because judging by the questions you have asked here and else where on this forum
I do not think you are capable of properly doing it..

That is all you will here from me here on out...
good luck with what ever you do...
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maxg1989
Posted: Thu Nov 12, 2009 2:39 pm
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Look you dont have to be an butt about it. And those people had to learn how to do it somehow also. And thats what i want to do. Sorry im not a professional LT1 tuner right out of the box. And i dont want to pay someone to continually tune my car. Besides a mail order tune they are sort of guessing at settings anyways since they dont have the car to see how it will react, Theres no doubt that they know better then me, but then again they have been doing it for a while, I guess i dont see why its such a big deal wanting to learn how to do it my self rather then be like most the clueless idiots out there that just let there wallet do everything for them. Personally i would like to know how my car works, and be able to make my own changes when they need be and not have to shell out 500 bucks each time.
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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ins0mnia24
Posted: Thu Nov 12, 2009 2:48 pm
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Just because I am not telling you what you want to hear it does not mean I am being an A$$..
But I have said everything that needs to be said on this so I am not wasting my time posting paragraphs of info..
Good luck
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