Tri-Five LS Swap Kit for 1955-1957 Chevy

Parts for putting an LS in a 1955, 1956 or 1957 Chevy: the Muscle Rods conversion kit, mounts and frame brackets, the Sure-Fit crossmember, mid-length and long tube headers, EFI fuel tanks for sedans and for Nomads and wagons, plus aluminum radiators for automatic or manual cars.

Made in the USA kit
Fits 150, 210, Bel Air and Delray
Headers bolt in with the kit

Open the 1955-1957 Chevy LS install guide for the drilling steps, then put your kit together.

$539.00 1955-1957 Chevy LS Conversion Kit

$309.00 1955-1957 Chevy Sure-Fit Crossmember

$299.00 1955-1957 Chevy LS Engine Mounts and Frame Bracket Kit

$715.96 1955-1957 Chevy LS 1-7/8 Ceramic Coated Mid-Length Headers

$939.00 1955-1957 Chevy LS 1-7/8 Ceramic Coated Long Tube Headers

$586.00 1955-1956 Chevy EFI Fuel Tank Kit - 255 LPH Pump

$649.00 1955-1956 Chevy EFI Fuel Tank Kit - 400 LPH Pump

$586.00 1957 Chevy EFI Fuel Tank Kit - 255 LPH Pump

$649.00 1957 Chevy EFI Fuel Tank Kit - 400 LPH Pump

$700.95 1955-1956 Nomad & Station Wagon Fuel Tank Kit w/255 LPH Fuel Pump

$755.95 1955-1956 Nomad & Station Wagon Fuel Tank Kit w/400 LPH Fuel Pump

$755.95 1957 Nomad & Station Wagon Fuel Tank Kit w/400 LPH Fuel Pump

$700.95 1957 Nomad & Station Wagon Fuel Tank Kit w/255 LPH Fuel Pump

$1,102.99 1955-1957 Chevy Radiator (Auto Trans)

$996.99 1955-1957 Chevy Radiator (Manual Trans)

$1,468.99 1955-1957 Chevy Radiator (Auto Trans) with Fan

$1,362.99 1955-1957 Chevy Radiator (Manual Trans) with Fan

$299.00 Cast Iron Exhaust Manifolds for LS Engines

1955-1957 Chevy LS swap parts

Conversion kit, mounts and crossmember

Headers and manifolds

EFI fuel tanks, sedans and hardtops

EFI fuel tanks, Nomad, wagon and sedan delivery

Radiators

Oil pan and oil system

What comes in the Tri-Five LS conversion kit

2 frame brackets
2 motor mounts
Transmission crossmember
2 transmission crossmember brackets
Polyurethane transmission mount
Bolt kit

Tri-Five LS swap fitment notes

Pick the Moroso high clearance pan or the LH8 pan. The LH8 must be trimmed to clear the 1955-1957 frame, and the guide shows how much.
Most factory LS accessory drives work. A low-mount A/C compressor hits the frame, so move it up top with a Kwik Performance bracket kit.
With a T-56, the body seam in the transmission tunnel is cut for relief and then flattened with a hammer and dolly.
The frame brackets butt up against the frame rivets. You mark and drill the mounting holes through the frame.
The crossmember brackets also need new holes, plus 1 inch access holes on the outside of the frame.
With the steering centered, expect about 2 inches between the drag link and the oil pan, and about 3/8 inch at full left lock.
The Sure-Fit crossmember is listed for 1955-1957 Chevrolets except convertibles. The long tube headers include convertibles.
The Muscle Rods headers are designed to bolt in with this kit.

Notes from the 1955-1957 Chevy LS install guide and the product listings.

1955-1957 Chevy LS swap FAQ

Which Tri-Five cars can I build a kit for?

The kit builder lists the 1955-1957 Chevy 150, 210, Bel Air and Delray. Convertibles are not covered.

Which oil pan should I use in a 55-57 Chevy?

The kit is designed for the Moroso high clearance pan or the LH8 pan. The LH8 pan fits once it is trimmed where the install guide shows.

Do I need different fuel tanks for a Nomad or wagon?

Yes. Sedans and hardtops use the 1955-1956 or 1957 tank. The Nomad, station wagon and sedan delivery have their own tanks, also split 1955-1956 and 1957.

Does a T-56 fit in the Tri-Five tunnel?

Yes, after work on the tunnel. The body seam in the tunnel has to be relief cut and flattened. The guide also gives a different crossmember bracket height for the T-56 than for a 4L60E.