1984 Corvette questions.

D

DeLong

Member
I have the chance to buy 2 84 vettes.

One is red at a dealer w 22k on it faded paint/peeling clear for 10g. Its a nice car (stock) but with the paint issue it makes me wonder if its been redone. Dealer says no. Hes a friend so I KIND OF trust him.Ive looked it over good and cant find any overspray ect.Is the paint thing common on these older vettes? Clear carfax fwiw.I offered $6300 for it before I found car 2 and they didnt bite.

The second is brown 2nd owner w 60k on it decent paint representative of the age for 6g.This cars a little bit cleaner and its carfax is also clear. New tires, water pump,ect and stock.This is the one Im leaning towards. Its about an hour away so can you guys give me any thing specific to these vette crossfire engines to look out for? Ive never owner one before so youd be right to think Im ignorant on these cars!
 
the going price for the crossfire 1984 corvettes IN THE LAST FEW YEARS is commonly in the $2000-$6000 range, DEPENDENT MOSTLY ON CONDITION, and I WOULD NOT GO HIGHER UNLESS IT LOOKED SHOW-ROOM NEW, AND ID PERSONALLY avoid THE 1984 AS THE CROSS FIRES A TOTAL DOG IN PURE STOCK CONDITION, IN MY OPINION, Id be looking at the 1990-91 tpi and 1995-95 lt1
shop carefully Ive seen clean 1995-96 corvettes for well under 12k
 
I read the crossfires a dog but its something I can easily afford at $5600. There should be some easy/inexpensive mods to make it respectible. Any suggestions?Ive still got the stang projects to finish/start and those are my long term priority. This would be a goof off daily driver/beer run car. It would still provide some type of cheap thrill wouldnt it? :D

The wife would shit if I bought a motorcycle so this is kind of a middle road thing.
 
Id suggest reading up on the 1984-1996 C4 corvettes and getting several auto trader and corvette trader magazines
if you want to perk up a cross fire corvette porting the intake and a cam swap helps
but replacing a stock restrictive intake to a converted SY1 or SMOKEY RAM INTAKE is a HUGE improvement in air flow!
Van Mattiza from Edelbrock indicated the SY1 was made in the late '70s and early '80. The castings were either broken or lost and would not be produced again.




SY-1 Intake Article Nov 2002 Car Craft had a resto article on an SY-1 intake they picked up at a swap meet. While they were playing with it they dropped it on an engine on a dyno. Results: "we found prestigious midrange torque, making 466 lb-ft @ 4600 rpm and 468 hp at 6000 with a Holley 750 compared to 443 lb-ft at 4600 and 486 hp at 6300 with the same carb atop a modern Edelbrock Victor single-plane intake." Article does not say how the small block engine was cammed or what heads, but the SY-1 produced very respectable numbers.
Click to expand...
http://web.archive.org/web/200603220017 ... tallation/
Dcp02846.jpg

Dcp02837.jpg


1984_Corvette_CCC_Fuel.jpg


read these threads
viewtopic.php?f=32&t=1148&p=5322&hilit=crossfire#p5322

viewtopic.php?f=32&t=2796&p=7243#p7243

http://jobyteknik.homeip.net/corvette/2002-11_offy_installation/

viewtopic.php?f=86&t=1397

crane114122.jpg

this is the largest cam ID suggest using in a stock cross fire with auto trans , its good for a 25-30hp gain and works with all stock components and gearing

crane114132.jpg

this is the largest cam ID suggest using in a stock cross fire with manual trans , its good for a 30-35hp gain and works with all stock components but it really works much better with 3.54:1-3.73:1 rear gearing and a larger fuel pump and adjustable f/p regulator

ok basics
keep in mind the concept of a chain is only as strong as it WEAKEST LINK
the stock heads flow less than 200cfm, the stock intake flows less than 200cfm and the stock cam is designed to max out at about 5000rpm, so you need to change all three components to get a noticeable improvement.

keep in mind the cars geared , stock to run in the 1200rpm-5000rpm power band.
if you want to keep the basic cross fire intake design the renegade intakes designed as a well designed improved flow intake, the OFFENHAUSER crossram intake can be modified for even better flow rates but its a good deal more work,
youll want heads that maximize the low and mid rpm flow potential so look for heads in the 180-200cc port size that flow at least 245-250 cfm at .500 lift
obviously a roller cam will provide more air flow than a similar duration flat tappet cam, but if you go much above 206 duration on an automatic trans you'll want a high stall converter or above about 212 duration on a cam for a manual trans or a auto trans you need to change rear gears to get the full benefit. and this is not the limit of what can be done to increase performance potential, a longer duration cam with more lift can be used to increase the average rpm and power band
but keep in mind all component changes tend to require further matching changes in compression,rear gear ratio, converter stall speed and air and fuel supply , header config. etc.
yes you can rapidly find that what you started out to build will require a great many more changes to be a well matched functioning combo than you originally thought might be required, and while you can increase power levels significantly , your finished project may have little in common with the original engine configuration.
https://www.corvettemods.com/C3-C4-...ke-Manifold--Crossfire-Injection_p_14318.html

http://garage.grumpysperformance.com/index.php?threads/ported-crossfire-383.10240/#post-41065

http://garage.grumpysperformance.com/index.php?threads/got-a-cross-fire-corvette.640/#post-25767

http://forum.grumpysperformance.com/viewtopic.php?f=32&t=2796&p=7243#p7243

viewtopic.php?f=52&t=181

viewtopic.php?f=52&t=5078

viewtopic.php?f=52&t=3802

viewtopic.php?f=56&t=495
 
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Yeah I've been hitting a lot of online sale sites and vette forums.I figured I'd check here too since you're on top of the vette stuff!
 
Well,I bought the 84 vette. It's pretty clean but I noticed a few issues I'd like to address. The main one is a oil leak coming from the back of the engine. I was thinking intake but after reading grumpys outstanding threads and info I'm hoping it's the oil pressure sensor. I have to get a look at it to verify it even has one since the links for parts show them starting in1985. The other is the e fan kicking on @230*. Why is it so high from GM! I found a link grumpy provided to a 190. I might throw it in unless you experts think it's too low.

Any who just wanted to give an update and thank grumpy for providing this excellent resource.
 
The '84's had a lot of issues with the digital instrument cluster, the old joke was; "If you haven't replaced it, you will!" There were so many problems a cottage industry built up of guys refurbishing them. No intent to scare you, just a heads up. ;)
 
Thanks guys. I saw a link here where they have autometer gauges on a panel prewired so you just swap panels. Very cool.

The wife loves this thing. I'm thinking I'll probably up grade to a c6 in a few years. Who knows. My friend having a lot full of em doesn't help!
 
A good friend of mine had a black '84 in the mid 80's, his had the 4+3 tranny, a bit of a gadget but still cool. We use to ride 3 in that thing, the smallest guy would curl up in the cargo area! :mrgreen:
 
If you have those tools, I can't think of anything else one would need in their toolbox. :cool:
 
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