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New Engine For 94 Suburban

 
rdem
I love my Chevy Chevette!
Posts: 4
Joined: 11/09
Posted: 01/02/10 11:29 AM

I am building a new 350 for my Suburban. My goal is to increase towing ability. current engine has a main bearing knock at start up which is the reason for a new engine. I will be running shorty headers a high flow cat, and a 3" in 3.5" out magnaflow exhaust and an MSD ignition. (currently has all but the headers) I am going to bore the block .030" over. I don't want to mess with the TBI, intake or the computer if at all possible. I will be using the stock heads and changing from dished  to flat top pistons, and one of the computer compatible RV cams, I want my max torque to be in the 3200 to 3500 RPM range.
Would this setup give me what I'm after or will the increase in CR require a computer modification?  

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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 01/02/10 01:24 PM

rd,,,
It all sounds good, what year/type heads are you going to use for your "new" 350
RV cams come in several lifts and duration, specs would help
good free flow air intake with low restriction exhaust might let you sneak flat tops past the ECM
Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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Pontiacman2
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Posts: 8956
Joined: 09/08
Posted: 01/02/10 01:33 PM

+1 cam specs and brand would help.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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rdem
I love my Chevy Chevette!
Posts: 4
Joined: 11/09
Posted: 01/02/10 02:09 PM

I'm looking at a Edelbrock performer plus 244/264 advertised duration and .398/.442 lift, or a comp cams 254/260 advertised duration .425/.440 lift. I'll be using 87? -95 heads, if I'm not mistaken these have 62cc chambers.  

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rdem
I love my Chevy Chevette!
Posts: 4
Joined: 11/09
Posted: 01/26/10 09:50 PM

Update, the new mill is coming together. I procured a donor engine, had it bored .030 over and the crank polished everything cleaned up nice. Pistons are Kieth Black  flat top claimer pistons, cam is a performer plus 244/264 advertised duration and .398/.442 lift. Will be using stock swirl port heads (87-95) CR should be 8.77:1 up to 9.4:1 depending on chamber volume and gasket thickness. The intake will be a edlebrock performer TBI with stock throttle body. The exhaust is shorty headers into a high flow cat and 3" in 3.5" out magnaflow. The factory air box has been opened up and I put in a K&N filter. Ignition is a MSD coil and distributer components and MSD super conductor wires.
 I have no idea what kind of power I should get, but the torque charts I've seen look like the max improvement will be at around 3000 to 3500 rpm. Right where I need it most.
 This is a towing vehicle so it likely will not see over 4500 rpm. So it should be well within the throttle body CFM and the flow capabilities of the heads.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 01/27/10 03:31 AM

it looks like I'm too late but I would've found some different heads and went with the CompCam instead of the Eddy  
luck is when skill and opportunity meet

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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 01/27/10 05:35 AM

+1
I'm not fond of Eddie cams,,, I found them lazy with too little pizzazzzzzzzzz
not enough snap for my liking,,, besides, I hate waking my engine up with an alarm clock,,, when all
I wanna do is,,,,,,, go
Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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69nova355.
I mow my lawn and find Chevys
Posts: 2560
Joined: 08/09
Posted: 01/27/10 07:49 AM

wouldnt long tube headers help his lowend torque too.  

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1993_Lx
I mow my lawn and find Chevys
Posts: 1851
Joined: 12/09
Posted: 01/27/10 05:38 PM

Thats what I was thinking. Aren't shortys almost as constrictive as stock manifolds and ten times harder to work around?

.  
Most call me Lx, but I was born Dakota

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idrivejunk
I mow my lawn and find Chevys
Posts: 5119
Joined: 12/09
Posted: 01/27/10 06:11 PM

I'd like to know the answer to that too, Lx  
idrivejunk

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 01/27/10 06:42 PM

shortys do flow better than stock manifolds but nothing like a set of full length hedders  
luck is when skill and opportunity meet

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1993_Lx
I mow my lawn and find Chevys
Posts: 1851
Joined: 12/09
Posted: 01/27/10 06:42 PM

Maybe he'll let us know Laugh  
Most call me Lx, but I was born Dakota

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rdem
I love my Chevy Chevette!
Posts: 4
Joined: 11/09
Posted: 01/27/10 09:13 PM

Full length headers would be optimum but would have required more extensive exhaust work. The shorty's seemed to be a reasonable upgrade and the price was right. It seemed to me that the manifold and cam package would be more predictable than trying to find a compatible cam, manifold, and tbi package. Seemed like a safe choice. If I can pull my trailer over the mountains faster than 20 mph I'll be happy.  

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69nova355.
I mow my lawn and find Chevys
Posts: 2560
Joined: 08/09
Posted: 01/28/10 05:45 AM

+1  

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Blazer35
I love my Chevy Chevette!
Posts: 6
Joined: 09/08
Posted: 02/09/10 07:00 PM

I have not had a good response on my posted question (which I will take the blame for) so I will try to define my question a little better on this one as it is very similar to what I am looking for.  

I have the 1994 TBI 350 in my Blazer and I want to freshen it up and get some more power in the process.  What can I do to help out the power but retain the Fuel Injection and computer if possible.  I am trying to search around on as many forums for advice so I don't spend a bunch of time and money and not get as good of results as I could.
Could I get some sort of top end kit from Edelbrock or somewhere similar and get an aftermarket tuner to make a chip for me?  Please feel free to share any knowledge everyone may have on this subject.
Thanks.  

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