Thread: TBI or CARB

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i gotta 79 mgb with a 1994 chevy 4.3 (262ci)with tbi.anybody got an idea how much horsepower ill loose if i swap out for a 4bl.the engine is a vortec and bone stock except for headers.the tranny is a 4L60

I don't think you will loose any, you might gain some. a 2bbl TBI isn't as good as a 4bbl carb, because it is designed around economy.

Originally posted by jdhogg
i gotta 79 mgb with a 1994 chevy 4.3 (262ci)with tbi.anybody got an idea how much horsepower ill loose if i swap out for a 4bl.the engine is a vortec and bone stock except for headers.the tranny is a 4L60

i dont know why you would want to do that, but at best it'll stay the same and if its the wrong carb. for that motor you'll loose big time. JMO

You might want to check if the carbed intake will fit. As I understand it, the Vortec has a completely different way of bolting on the intake manifold. The manifolds that aftermarket suppliers support are the non-Vortec engines built prior to 1992.

Now I don't know this to be fact, but I highly suggest checking to make sure a carb manifold will fit with those heads.

they do make carb manis for the vortec motors, but they tend to not be cheap.... check ebay for a general overview

edelbrock makes an intake manifold for it.the reason behind this is if it ever broke down on me what the hell would i do.i dont know squat about these computerized cars and chevy wont work on it,im just wanting to make it more reliable

it should have no problem handling a 600cfm, you'll have to change metering rods and jets more than likely... but nothing extreme.....