TBI or CARB

[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

[Matt167]

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.

[lt1s10]

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

[Swifster]

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.

[thesals]

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

[jdhogg]

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

[thesals]

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