View Full Version : Motor Swap


1978camaroltrs
12-04-2011, 10:41:23 PM
I am wondering if a 1988 Chevy 350 would fit in a 1978 Camaro with a 350, I found a good deal in town on a 1988 chevy 350 with 75,000k on it so im thinking of buying it and throwing it in a camaro that i will be buying soon... will it hook up to a TH350 tranny with no problem or should i buy the 700R4 the guy has for sale aswell?

cmonson
12-05-2011, 12:30:29 AM
It will work without any issues as will as bolt up to a th350.

You may have to go to an electric fuel pump however as there may not be a provision for a mechanical pump.

1978camaroltrs
12-05-2011, 01:32:10 AM
It will work without any issues as will as bolt up to a th350.

You may have to go to an electric fuel pump however as there may not be a provision for a mechanical pump.

Also the motor is carb if that makes any difference, and yeah no problem I can find an electric fuel pump easily funny you should mention that the guy has a electronic fuel pump aswell..... How much power do you think this car would make with the new motor. :D

2ndgenhunter
12-05-2011, 03:39:13 AM
The 88 LO5 350 only made 220hp new. after 75k I would guess 190hp@ the flywheel.

If it is carb, Make sure that it has the correct intake on for the 87up heads and not a 86 back intake jerryrigged to work. The 88 LO5 350 was fuel injection from the factory.

Make sure you get the correct flexplate for the 87 up 350. It has the 1 piece rear main seal.

mildthing
12-05-2011, 12:34:42 PM
'88 LO5 was 210 HP @ 4000 RPM, 300 ft-lbs @ 2400 RPM. There never were any LO5s rated 220 HP.

2ndgenhunter
12-05-2011, 12:39:31 PM
'88 LO5 was 210 HP @ 4000 RPM, 300 ft-lbs @ 2400 RPM. There never were any LO5s rated 220 HP.
My bad, Sorry I missed by 10 hp.

1978camaroltrs
12-06-2011, 12:41:49 AM
My bad, Sorry I missed by 10 hp.

Need you opinion... I am thinking of buying that motor in the next week or two but in the images it looks like the motor has been ripped apart what should i do?

Air_Adam
12-07-2011, 10:58:42 PM
'88 will have a 1pc rear seal - needs a different flexplate from your '78 block.

Ryan 79
12-08-2011, 01:04:13 AM
I did this swap on my 79 pickup.

First off, the 87,88,89,90 stock 350's are complete dogs. There's no power there. Speaking from experience, I wish I'd have kept the older 400 I had laying around.

These engines have notoriously low oil pressure. the Haynes manual says 6 pounds at idle, 18 pounds at 2000, and 24 pounds at 3500. So if you install this motor, put an aftermarket gauge on it, and you show almost nothing at idle and 25 pounds at 3K, it's fine, that's just the way they are. My 350 had just been rebuilt, and it still has no oil pressure. It's not a problem, I've worked the piss out of this motor for 3500 miles now, and if the low oil pressure was an issue it would have blown up a long time ago. I've got an Autometer electric gauge in it.

The heads have a different sized hole in it for the temp sensor. Napa sells a sensor that is supposed to screw into the later head and work correctly with an older gauge, but save yourself $40. It does NOT work. You can either put the stock sender in the water pump or buy an adapter to make it fit.

You'll need a different flex plate, but the motor should have the casting for a mechanical pump. Just use a stock 350 mechanical pump.

Those blocks should all be set up for a roller cam, but truck motors came with a flat tappet cam

mildthing
12-08-2011, 10:14:23 AM
The LO5 was used from '87 to '95. '93 saw a change of the rated output, to 200 HP and 310 ft-lbs. Not sure why.
Converting them to carbureted will kill most of their available responsiveness, no matter how many carburetors and distributors you try.
The LO5s all offer more output than any LM1 ever installed from '75-'81.
LO5s love gearing. But you can over-do it.
If you're running 255/60R15s, then do a 700R-4 with a 3.42:1 gear at most.
Forget 3.73:1 unless you're running 275/60R15s, which I wouldn't.
If you're on 235/60R15s, then a 3.08:1 would be good. ( still 700R-4 )
You won't actually have performance, but you can get MPG in the mid 20s, and it'll feel much better than it really is.
If you insist on carburetion, then you need either the '87-only LG4 intake manifold, or the Edelbrock 3706. Top with a freshly re-manufactured Q-Jet from a 1980 LG4. Set your HEI for 6 degrees initial advance, with another 28 degrees of centrifugal.

Ryan 79
12-08-2011, 03:26:28 PM
The LO5 was used from '87 to '95. '93 saw a change of the rated output, to 200 HP and 310 ft-lbs. Not sure why.
Converting them to carbureted will kill most of their available responsiveness, no matter how many carburetors and distributors you try.
The LO5s all offer more output than any LM1 ever installed from '75-'81.
LO5s love gearing. But you can over-do it.
If you're running 255/60R15s, then do a 700R-4 with a 3.42:1 gear at most.
Forget 3.73:1 unless you're running 275/60R15s, which I wouldn't.
If you're on 235/60R15s, then a 3.08:1 would be good. ( still 700R-4 )
You won't actually have performance, but you can get MPG in the mid 20s, and it'll feel much better than it really is.
If you insist on carburetion, then you need either the '87-only LG4 intake manifold, or the Edelbrock 3706. Top with a freshly re-manufactured Q-Jet from a 1980 LG4. Set your HEI for 6 degrees initial advance, with another 28 degrees of centrifugal.

Forgot about the intake.

The intake bolt angles and sizes(the 87s are metric) are different on these motors than on an older SBC. Some guys here have successfully taken a stock GM manifold and hogged out the holes and used the intake, I had an Edelbrock aluminum intake off my old motor, and by the time I got the holes hogged out enough to get the bolts in the head, there was almost nothing left on the intake, if I had gotten the bolts in and tight enough it would have cracked the ears off.

Plan on buying an intake, and that one isn't cheap. If you put an Edelbrock carb on it, you've got to buy the adapters as well.

If you haven't bought this engine yet, I would seriously recommend AGAINST doing it. I would seriously consider giving mine away if I had another motor to put in there, I hate this motor that much.

Find a decent running older motor, you'll be better off, and it'll save you a bunch of money