new to group so please excuse my question because i am sure you have been asked this before. i am installing a 5.3ls & trans from a 1999 Chevy Silverado into my 1984 Chevrolet Elcamino.. want to swap the truck intake for a car intake for hood clearance & looks. not interested in adding performance; so what stock GM intake do i need? any other helpful info appreciated. looking to do this swap the cheapest way. so i am new to all this stuff, got to learn. please be specific on the intake with application so i don't screw up & buy wrong intake. thanks

 

Any cathedral port intake. LS1, LS6

 

Agreed, LS1 or LS6 intake, then you'll need the fuel rails for it too or aftermarket fuel rails.

Make sure your fuel system is setup correctly and the tune is right for the fuel system style, aka return or returnless. Plus the tune needs changes for the car intake swap too.

 

No worries, this is a very common LS swap question.

Your 1999 5.3 Silverado uses cathedral-port heads, so you need a cathedral-port “car” intake manifold. The cheapest correct swaps are:

• LS1 intake manifold (1998–2002 Camaro/Firebird)
• LS6 intake manifold (2001–2004 Corvette Z06)

Both will bolt directly to your 5.3. The LS1 intake is usually the cheapest and easiest to find. The LS6 is slightly better designed (lower profile, a bit more efficient), so it can help with hood clearance in your El Camino.

What you’ll also need:

• LS1/LS6 style fuel rails (truck rails won’t fit)
• Car-style throttle body or an adapter
• Some vacuum line rerouting (EVAP, brake booster, etc.)

Since you’re not chasing performance, LS1 intake setup is the simplest aud77 casino login budget-friendly route. Just make sure you get the matching accessories together so you don’t end up buying parts twice.