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Head-ache for my 350?

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Old May 30, 2007 | 11:58 AM
  #1  
Unholy 89's Avatar
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From: Hotlanta, GA--- Home of the Bandit!
Car: '89 5spd GTA
Engine: 305(LB9) TPI
Transmission: T-5
Axle/Gears: Borg-Warner 3.42
Head-ache for my 350?

Just got my 1992 350 back from the machine shop all shiny and clean. The guy did find that the 193 heads were cracked. Now I'm trying to find out if my current LB9 heads would work with this cam

COMP CAMS Xtreme Energy
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,200-5,200
Intake Duration at 050 inch Lift: 212
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 264
Advertised Exhaust Duration: 269
Advertised Duration: 264 int./269 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.495 in.
Valve Lift with Factory Rocker Arm Ratio: 0.488 int./0.495 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No
Grind Number: CS XR264HR-12

I plan on using the stock lifters and the stock TPI setup from my LB9. I will set up the fuel pressure to 49lbs and run the 19lbs injectors for now. Also putting on a set of Hedman shorties.

I've done a ton of searches and found no definitive answers.

My question is this. If I run the following parts, how will it run?

1992 SBC 350 from a caprice, standard bore and bottom end
LB9 Heads--stock
shorty headers
49lbs fuel pressure with stock TPI and 19lbs injectors
cam listed above
MSD 6 box and coil
MSD super conductor wires
no cat
stock LB9 computer

Just trying to get by cheaply to keep the wife off my a$$

Any suggestions are appreciated and welcome
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Old May 30, 2007 | 12:07 PM
  #2  
Apeiron's Avatar
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Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Head-ache for my 350?

Originally Posted by Unholy 89
Computer Controlled Compatible: No

stock LB9 computer
You're going to run into problems here.

If you're on a budget, forget the MSD stuff. It won't give you any benefit.
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Old May 30, 2007 | 12:21 PM
  #3  
1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: Head-ache for my 350?

I agree. Forget the MSD stuff and put that money into the heads. I believe the LB9 heads will raise the compression to high. You should be able to find some decent 64cc iron heads cheap enough.
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Old May 30, 2007 | 12:23 PM
  #4  
sofakingdom's Avatar
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Re: Head-ache for my 350?

19lbs injectors
You'll also have trouble there. Bumping the fuel pressure won't really work.

You can pick up used injectors on eBay all day long, for less than $50 a set.

That cam will work fine for the application at hand, even though it's not listed as "computer compatible". It actually is, in my personal experience, even in a 305.

The LB9 heads will work fine.

I agree about the MSD stuff; HUGE waste of $$$$ there. Also, use Taylor wires; just as good if not better, and there's no point in paying the extra cover charge for the MSD name.
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Old May 30, 2007 | 12:25 PM
  #5  
Unholy 89's Avatar
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From: Hotlanta, GA--- Home of the Bandit!
Car: '89 5spd GTA
Engine: 305(LB9) TPI
Transmission: T-5
Axle/Gears: Borg-Warner 3.42
Re: Head-ache for my 350?

The guys at Summit told me this would work. Any suggestions?
I already had the MSD stuff and its now on the 305TPI
----------
Summit tech said around 9.9 compression ratio with the LB9 heads

Last edited by Unholy 89; May 30, 2007 at 12:27 PM. Reason: Automerged Doublepost
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Old May 30, 2007 | 12:30 PM
  #6  
sofakingdom's Avatar
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Head-ache for my 350?

Any suggestions?
Get the right injectors.
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