f body lover

a friend of mine doesnt like his Sierra peformance so I suggested to him he swaps the 5.3 to LS1 we need to know if there is a serious work for the swap like wiring,ECU,,etc ? can we use the stock wiring and computer from the Sierra on the LS1?

F-Body Lover

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Bo185

Its a bolt in swap the longblocks are the same size. Reuse the truck intake and acc. Then all he needs is a tune for the larger motor! But a 6.0L swap will most likely be cheaper.

Empatho

iTrader: (16)

I don't think it's worth swapping the 5.3 to a 5.7. He should do a 6.0 instead, or mod the 5.3.

F-Body Lover

really? thats sounds easy but what if we want to use LS6 intake ? we need the f body fuel rail along with the injectors right? the 6.0 is most wanted in my country plus I got this LS1 sitting around for a while so we thought build fast truck with low budget

Earl Filter

iTrader: (1)

Agreed! Heads/cam the 5.3 is how I'd go, if the engine is otherwise healthy.

Earl Filter

iTrader: (1)

Why? That truck intake will be fine to make low-end torque, which is what it needs.

F-Body Lover

then we will keep the truck intake any suggestions on the swap guys? on cam or other mods?

Earl Filter

iTrader: (1)

Is this a regular cab, or 4-door? Is it a daily driver? Does he tow anything with it? Just want to know how it's going to be used. I think I'd go with a mild cam and a good torque converter (Circle D, Vigilante, or Yank) for starters. You wouldn't have to really touch the heads yet. Then you'd need a pcm tune. If you can't get a dyno tune, many offer a mail-order tune, like Frost, that would complement whatever mods you do to the truck.

F-Body Lover

its regular cab short bed stepside and its almost daily drive it doesnt matter that much if it has choppy idle or rough idle the owner wants more power by any means lol

Earl Filter

iTrader: (1)

Stay on the mild side with the cam, and it will be a lot of fun. Do you know what the rear end gear ratio is?

I think I'd build on the 5.3, in stages if need be. I don't think the gains would be worth the work and trouble to go the LS1 just to gain 21 cubes.

F-Body Lover

the gears are 3.73 from factory as it says GT4 RPO code and the engine is LM7