Hey guys another tech question. Just wanted to get some advice on changing my 1990 350 from tbi to carb. Just don't want to deal with the electrical stuff. I know I have to change the manifold, carb, distributor, and fuel pump. But is their anything else I should be aware of? I am budget minded, so help me out . Any advice is appreciated! Thanks
make sure the intake you get is for the newer center bolt heads..if not buy an old gm aluminum one and cut the center bolt holes to fit...they also sell a bushing to put on bolt before you lock it down to help keep the proper angle....although it is actually easier in my opinion to add the wire harness and ecu from the auto you got the motor from and just drill a few holes and add the fuel lines...just about as much work and the fuel inj. is more efficient and reliable...unless your battery dies and your into push starts make sure you get the carb right for the stock roller cam in the motor or you'll have some issues there too..other than that its straight forward man.
The cam that is in there now does not have a lobe on it to drive a mechanical fuel pump. The mounting boss for one is there on the block, and the push rod hole should be too (this disappeared later). If you keep the cam, you will have to run an electric fuel pump. While you are shopping for an electric fuel pump, get a regulator too, especially if you are running an Edelbrock carb. They are very sensitive to fuel pressure. The original roller cam works pretty well with a conservative carburetor. Look for something 600cfm, vacuum secondaries are a must. Another issue is the roller cam (as are all) is very hard steel, and requires a hardened distributor gear. While you can use any old-school distributor, if you use the gear that comes on it, the cam will eat it, and ditch the grit into the oil, possibly destroying the engine. You will need this, or the equivalent: http://www.summitracing.com/parts/ACF-10456413/
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