84xfires

i know iv read here somewhere that the 5.3l v8 would fit in my 84 .. but i cant find that thread can anyone else confirm that ? on a side note if i had 2k to go into my stock motor what would i do with it ? i have an old 350 block with some 202/194 heads and a pete jackson gear drive all siting in the shop should i use those blocks and heads ? or go some other way i also got 2 tunnel rams with carbs.. but im thinking it would look funny sticking out the hood on my 84 ..

JD'S WHITE 93

A new 5.3L truck motor ? Or are you talking about an old 327 ? The old 327 will fit of course it's the same demensions as your 350 Crossfire. The new 5.3L will fit too, I do not not know if the motor mounts would need to be changed but it would FIT.

xrcrx

The 5.3 would physically fit. However, there have been many projects to put an LSx engine in a C4 and they always seem to stall. It's not a bolt it in and forget it prospect. The accesories and motor mounts are among the many hurdles to overcome. Good luck. I'm currently putting together a 383 Crossfire for my 84!

coupeguy2001

the 5.3 LS motor is an LM series engine. It is physically the same as a 350, but the motor mounts are the least of the problems.
There are kits to make a distributor drive off the cam, and put a carburetor on it.. I would think that you could pay some one to make adapters for a dual quad manifold, and use your throttle bodies and make them a little lower than they would sit if they were mounted on top of the manifold.
Then you would be able to keep all of your factory electronics and your hood intakes if you modified the throttle body air horn adapters.
Then you would have to figure out the trans, and the rear trans mount would have to be fabricated, or use a truck trans, but that would be clunky.
Clunky has no place in a corvette.

84xfires

oh i never planed on useing a tunnel ram .. i dont wanna have carbs again atleast not on this car i was thinking of the new 5.3l truck motor it has decent hp stock ... compaired to my stock engine anyways plus alot of the ls1 upgrades will work with it. i was wanting to do a ls1 but i dont want something that has to be totally custom installed id like it to be somewhat boltin so to speak

Demonic85

Why go smaller? If anything i'd be trying to cram a big block in there like others have done. A hopped up 350 is great because the parts are cheaper than a big block and are more plentiful. Not to mention it can make a lot of power if done correctly.

CFI-EFI

Good for you. It is a little nuts to backward in technology on these, the first, to break through with EFI.



There is no question the Gen III engines are superior to the Gen I and II engines. However the 5.3L truck engine is the same custom install as it's bigger 5.7L, LS1, brother. The two Gen III engines, the 5.3L and the LS1, are peas in a pod to one another. And that is a very different pod than your Gen I, L83, came from.

RACE ON!!!

cv67

5.3 is a good motor. Some head work, mild cam and longtubes youll have quick car, doesnt take much to get 450chp out of those and do it reliably.

Demonic85

Yes and then you'll need to upgrade the rest of the drivetrain which isnt as reliable.

CFI-EFI

Horsefeathers!

RACE ON!!!

cv67

or just add a stroker..

http://www.youtube.com/watch?v=PwB4C...elated&search=

c4cruiser

Corvette Fever magazine is going to be doing a series of articles about installing a 5.3 truck motor in an '87. They are calling it "Project C4orce"

Might want to get the July 07 issue and read the "First Turn" section.
They also have a blog going at www.corvettefever.com regarding the swap.

84xfires

well that answers my question if its not gunna be any easier to put in then its not worth doing even tho you can get these truck engines a few dollars cheaper its still prolly not worth it even tho its a great motor i am thinking im going to sell my car and go to a 92 but i havent decided yet

cv67

How about this one, its already done.

http://forums.corvetteforum.com/show....php?t=1720807

Slalom4me

I am not sure where to begin. For brevity, I'll say that

• The 5.3 is an LM series, not an LS series engine.
  There are LM4, LM7 and L33 versions of the 5.3. The LM series have
  Fe/Al blocks/heads (as do the larger LQ series - 6.0 & 6.2.) The L33
  and the LS series are Al/Al.
• The 5.3 is physically different to a GEN I 350: outwardly and in
  terms of displacement.

As has already been stated above, considering the effort and expense
of this swap my vote is that the larger displacement version is the
preferred choice. There is little if any difference in price between the
LM and the LQ choices but there is a sizable difference in performance.

Still, in the spirit of supporting alternative thinking, I suggested that
if small (5.3L) is good, tiny (4.8L) might be better.

The 4.8L LR4 engine is a 293 ci version of the GEN III engine that has
almost as much OEM HP as the 5.3

- 285HP/295TQ @ 5600/4000 - vs - 290HP/325TQ @ 5200/4000

but with a shorter stroke (3.270" vs 3.622") the LM4 is capable of much
higher RPM (3,540 FPM vs 3,924 FPM Piston Speed @ 6,500 RPM).

Presumably, the same logic used to predict that the 5.3's would be
priced lower than 6.0's would see the 4.8 being priced even more
attractively. However, in the thread below the 4.8 was deemed too
small by those who thought the 6.0 was too big.

Here's a discussion of the article.
Corvette Fever- Project C4orce- Have you heard?

Melrose announced they were preparing to release headers for the
GEN III / C4 swap.

LSx Engine Swap into C4- Headers Avail Soon

As a final thought, Trace's '84 LS1 C4 is listed in the C4 Cars for Sale
section.

F/S 1984 LS1 Vette

.

Slalom4me

Oops. Dupe.

Sorry, cuisinart. I didn't notice your link to LS1C4's thread before posting.

.

Jeffvette

The hurdles aren't major. They just take time or money to correct. Most of these would go smoother if a parts list was made out of what works and what didn't. The other issue is so many people feel the need to reinvent the wheel. If you look at all of the LS swaps, none of them are the same.

My major hurdle is the trans bracket I bought that was supposed to work didn't. It's a POS. So I'm spending time fabbing one up.