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Topic: L-48 wake up

in Forum: C3 Engines


L-48 wake up

Posted: 8/28/07 6:47pm Message 1 of 24
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
O.K. Here goes. I'm new on this c3vr sight. I've had my '79 Vette for 4 years now. It really was a barn find. I had to get the valve guide seals redone because it sat unstarted for three years. It runs fine but now I want it to wake up a bit on my budget.
Common sense says buy a ZZ4 crate motor and let that be that. HOWEVER, common sense must have a big check book laying around. I don't have dreams of ever making my L-48 a fire breathing monster but let me know if I'm on track for waking it up a bit.
Last year I installed a true dual exhaust system. Now I want to install an Edlebrock Performer intake manifold, a Mallory dist., new plugs and wires.
How am I doing so far?



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L-48 wake up

Posted: 8/28/07 6:56pm Message 2 of 24
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
True duals is a good thing...let it breathe.

The Performer is better than the stock intake, but not by as much as you might think. It's more or less a stock performing intake...just aluminum rather than cast iron. On the '78 I owned I installed a Performer and was happy with the results.

If you have the original Quadrajet, get it professionally rebuilt...that can make a big difference matched to the rest of your upgrades. It's no better than the weakest link, and if the carb has never been rebuilt, it likely needs it pretty badly. The Q-Jet is about as good as it gets for a street car.

It's hard to beat an HEI distributor but they're honestly set up more for emissions during that time period than performance. The Mallory is a good choice. If it's a Unilite, get the voltage                                          filter Mallory makes for it...if you have a sudden voltage spike, it will save you from frying the electronics in the distributor.




L-48 wake up

Posted: 8/28/07 7:16pm Message 3 of 24
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
Gunslinger, thanks for the advice. I'll definitely get the voltage filter before I install the new dist.
The Q-Jet seems to be doing a good job now. However, I'd like to have it rebuilt by a good shop over the winter. Any suggestions as to who does a good job in the NY/Pa area? What would be a fair price? (As you may be able to tell, I'm kinda new at this.)



L-48 wake up

Posted: 8/29/07 6:13am Message 4 of 24
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
I don't know who a good rebuilder is in that area. Try contacting some local Corvette clubs and ask them for advice on that.

I would think a good rebuild would cost somewhere in the $200 area...at least it was somewhat less than that when I last had a Q-jet rebuilt about four years ago locally. A lot depends on exactly what's needed to do it right.


L-48 wake up

Posted: 8/29/07 9:28am Message 5 of 24
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Eastern Oklahoma County, OK - USA
Joined: 1/3/2006
Posts: 1560
Vette(s): 1980 Black L48 T-Tops
I much prefer the MSD Streetfire dist over the Mallory.  If you check out some of the old threads, there appears to be a lot of problems with the Mallory systems.
 
The MSD Streetfire was very straightforward and made a diff right out of the box.  Next step, playing with the weights and springs!



L-48 wake up

Posted: 8/29/07 10:37am Message 6 of 24
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SHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto

1978 L82 4speed

1994 LT1 6speed
You may also consider looking around for a good set of heads... i know it might be a bit 'out of budget' , but if you use a little patience and look around, sometimes you can come across a good set at a good price.  I picked up a set of double hump heads at the Corvette Expo many many years ago(1966 year, small valve(1.94 inch) for around $200... however had to put about another 300 in valve guides and a few new valves... but it did it make a  considerable difference.  


StingrayJim
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Stingray's '76���������������������������� StingrayJr's '78���������������������������Lil Red '94

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L-48 wake up

Posted: 8/29/07 12:45pm Message 7 of 24
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Irving, TX - USA
Joined: 8/21/2004
Posts: 4273
Vette(s): #1 -1969 Corvette Coupe Riverside Gold, black interior,MN,A/C,350/350,PS,PB,window cranks. #2 -2000 C5, black/black, 6 sp, Bose system & lots of buttons.
I have had nothing but trouble with Mallory, so IMHO it sucks and I would NEVER buy anything Mallory.  I also had the Edelbrock Carb & manifold on my '69.  I got better gas mileage, but the car ran like crap because the Edelbrock Carbs can not handle the gas  mixture with Ethanol (did I spell that right?) that's at all the gas stations now. Dead


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L-48 wake up

Posted: 8/29/07 5:13pm Message 8 of 24
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Eastern Oklahoma County, OK - USA
Joined: 1/3/2006
Posts: 1560
Vette(s): 1980 Black L48 T-Tops
If you can find a set of 993 heads (I'll find all the numbers later) from Chevrolet that are NOT mexican, then get them.  I put them in mine and they are great!

They came off a '69 I think.



L-48 wake up

Posted: 8/30/07 4:56pm Message 9 of 24
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
3998993
The 993 heads came off 72-73 307/350...75cc chambers

rearn2go722007-08-30 16:57:03


L-48 wake up

Posted: 8/31/07 2:10pm Message 10 of 24
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
Stingray Jim,
   The (used) heads and a set of headers are on my to do list. I'm thinking ahead to next spring and will be looking around.
   I'll need to get a better understanding of what SBC types of heads I would be able to install on the L-48. I'm real interested in this stuff but don't have much experience so far.
   Thanks for your reply. 
     



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