Swaping TBI for Carb - Need Advice
Replacing the factory 4cyl TBI engine in my '82 Camaro with a 350 carbureated. I know I cant just pull the TBI & drop in a carb engine, but I'm sure there's gotta be somethings I'm not thinking of.
Are there any sensors that TBI uses that a carb engine wouldn't? Can I just unhook them or is there more to it?
Fuel Pump: Has an in-tank pump/sending unit, planning to replace the pump portion with a piece of hose & put a mechanical pump on the block. What if I go with an electric pump, any difference?
What else is there that I'm not thinking of?
Building the engine is the easy part, but I'm still a novice when it comes to the details. You guys have always given me great advice in the past and I appreciate all the help! Thanks!
Just a couple thoughts:
As long as smog inspection isn't a consideration, you will need the motor mounts for a V8, as well as a V8-spec tranny to replace the 4 cyl. unit you now have- one from a 3'rd. gen F-body w/the torque are unless you're going to replace the rear end- which should be considered because the 7.5" diff is weak-kneed.
The radiator and shroud from a V8 car is needed. I'd also plan on an auxiliary tranny cooler while I was at it.
You may be able to use the TBI fuel pump, if you regulate the pressure down from the ~15 psi it now has to around 6 psi or so, for a carb.
AFA the sensors, etc, you'll not be able to use the PCM so about all that would be reused from the TPI set-up would be the gages for oil, temp, and charging system. The rest will be unused.
The front springs (at least) will need to be replaced most likely. If it was a V6, you might have gotten away w/o replacing them, but I'm fairly sure the 4 cyl. springs/struts will be wrong.
If i go through with my trade for a K5 (I'll miss my Cherokee), I'll likely be doing this as well.
It has a 4-speed manual tranny, that should handle the 350 shouldn't it?
I'll have to look how big the rear-end is, was thinking about going posi anyway.
Hadn't though about springs though, thanks!
You can use the stock TBI fuel pump and use a Holley Bypass Regulator to regulate down to carb pressure.
I just did this swap in my C1500. Went from a 4.3L TBI to a Carb 350.
Im using a HEI Distributor, Demon carb, and i bypassed the oil psi unit wiring, since mine broke and if the fuel pump doesn't get a signal, it wont run.
We did this swap way back in 89. You`ll need to find a V8 parts car, as you will need the V8 crossmember. If memory serves the four cylinders bell housing doesn`t match the V8`s, I know the 6 cylinders didn`t. If it won`t swap and you want to go with a automatic you`ll need a TH350 short tail, and the adapter that lets the torque arm bolt up to the transmission, If I remember correctly, B&M makes these. Or if you want to go the 5 speed route get one out of a firebird or camaro that came with one from the factory. As mentioned, you`ll need a V8 radiator and you`ll need to change the front coil springs otherwise the front end will sit low by about 3 inches and make it not very safe to drive. I have the codes for factory posi rear ends that came in the Camaro Z28 and Firebird Trans Am cars from 82-87. Let me know if you want them. Why I advise getting a donor car as when we did it, we wished we would have had a donor car, it would have saved us many trips from the junk yard. The mount ears that mount on the side of the block, make sure you get them off a chevy pickup and remove the spacer, this will make the engine sit fully down in the engine bay. I`m not sure what fan you plan to use but If I remember you`ll need the V8 upper radiator cradle and the V8 fan shroud if you plan to run a clutch fan. The holes for the V8 mounts will already be present in the frame so that makes it a bolt on, this is a 2 man job unless you`ve did it enough times you`ve gotten used to it. There`s likely more things I can`t remember off the top of my head that will have to be swapped as well. But all things aside, if you can get a V8 Donor car, you`ll be money ahead, if you do it without a donor car, you`ll end up spending well over 3 to 4 grand. In the past that was way I told others unless you have a V8 donor car be prepared to spend some money, but first, look at the car and ask yourself is it worth it.
Chevrolet TPI & TBI
V8 Engine Swapping
Sure, here they are.
1982 2JR 3.42:1
1982 2JY 3.08:1
1982 2JZ 3.23:1
1982 2PZ 3.23:1
1982 2PY 3.08:1
1983 4JQ/5JQ 3.73:1
1983 4JR/5JR 3.42:1
1983 4JY/5JY 3.08:1
1983 4JZ/5JZ 3.23:1
1983 4PQ/5PQ 3.73:1
1983 4PY/5PY 3.08:1
1983 4PZ/5PZ 3.23:1
1984 6EF 3.42:1
1984 6EP 3.42:1
1984 6JQ 3.73:1
1984 6JR 3.42:1
1984 6JY 3.08:1
1984 6JZ 3.23:1
1984 6PQ 3.73:1
1984 6PY 3.08:1
1984 6PZ 3.23:1
1985 8JP 3.08:1
1985 8JQ 3.23:1
1985 8PP 3.08:1
1985 8PQ 3.23:1
1985 8PR 3.42:1
1985 8PS 3.73:1
1986 2H5 3.73:1
1986 2HT 2.73:1
1986 2HV 2.73:1
1986 2HY 3.23:1
1987 2HQ 3.23:1
1987 4HF 3.08:1
1987 4HY 3.23:1
Are these codes located on the rear end itself, or where would I find them? Thanks!
You can also use the RPO sticker from inside the console, hatch or glovebox to determine what came in it, ratio-wise. The sticker looks like:
Of course, this doesn't mean that is what is now in it. Dropping the cover is the surest way to know.
Some RPO codes from HERE:
41 : 15 = 2.73 (RPO GU2)
41 : 14 = 2.93 (RPO GU3)
40 : 13 = 3.08 (RPO GU4)
42 : 13 = 3.23 (RPO GU5) / Approx. RPM’s at 70 mph--2133
41 : 12 = 3.42 (RPO GU6) / Approx. RPM’s at 70 mph--2255
41 : 11 = 3.73 (RPO GT4) / Approx. RPM’s at 70 mph--2463
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