350 TBI Timing

[mattdavis11]

Has anyone ever messed with one? What I've gotten myself into is building a 350 motor up with a hotter cam. Why the owner didn't want to do more is beyond me, but it's his money, not mine. Anyway, from what I know the cam requires the timing to be 27 degrees BTDC, which I should be able to accomplish with a timing light after I get the motor to TDC.

My question is what to do with the timing advance on the distributor. Do I have to fudge with the ECU? I've read some on the subject, but haven't run across any information that really nuts everything down like Pelican does with a Porsche. It's a 3/4 ton 1988 4x4 Suburban TBI 350.

Thanks

[Scott R]

I put a 350TBI into my 72 LandCruiser with a hotter cam, the ECU gets a reference signal from the distro, but that's about it. I had to reprogram the ECU to drop the VSS sensor, and I don't remember anything in the code about advance. TBI is very forgiving, and very simple, you can do most anything with it.

For reference, this is how well my 350TBI modified ran the first time we drove it:

[Porsche-O-Phile]

I had almost the same vehicle for a few years - an '88 GMC Sierrra 2500 (3/4 ton). If you want to do anything even semi-serious with respect to making power, get rid of the TBI and go with port injection. I never really did too much serious with the truck though - didn't really see the point. Even if you make 400+ h.p., it's still in a vehicle with terrible handling characteristics and that weighs twice as much as a sports car with the same power. Not my cup of tea.

There's a good forum here though:
http://67-72chevytrucks.com/vboard/