5.7 TBI to Carb swap + Rebuild Questions

MotoCARR · Jan 20, 2017

Picked up a running 5.7 from an '88 Suburban with ~170K. I'm going to give it a good clean, paint, and rebuild/replace items as needed as I go along before putting it in my RX7 that has a 305.

-350 will get the Holley 600 carb that is currently on the 305
-350 will get the Headman Headers that is currently on the 305
-350 will get the OEM rebuild/overhaul kit from Summit
-350 will keep the stock heads

Question 1: Is swapping to carb as simple as replacing the intake manifold with the likes of an Edelbrock Performer or using a carb adapter?

Question 2: Is a cam swap worth it being that the only other potentially replaced parts would be the intake manifold and headers?

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vic_v8 · Jan 20, 2017

Are you looking to make power? Throw away the stock heads, buy used Vortecs with a China knock off intake, add carb and cam, then you'll be 350 hp depending on parts. If you go with that plan you have, about 230 on a good day.

MotoCARR · Jan 20, 2017

I'm not opposed to doing Vortec heads, but to be honest I'm a bit new to GM power plants.

I have know I can replace stock with aftermarket, but I'll admit I'm lacking in knowing how to mix & match parts from other cars, on GM engines.

Is the swap as simple as getting Vortec heads, getting them prepped, and bolting them on the block?

Champ · Jan 21, 2017

Yup! Vortec heads are a direct swap. They are worlds better than the TBI heads. I would absolutely do a cam if you're going to go that far.

Black_cirrus · Jan 21, 2017

One catch to the vortec heads is they use a different intake bolt pattern, thus you need a vortec specific intake but they are great heads and a heck of a value.

5.7 TBI to Carb swap + Rebuild Questions

MotoCARR

Newbie

vic_v8

OBS Enthusiast

MotoCARR

Newbie

Champ

OBS Enthusiast

Black_cirrus

I'm Awesome

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