Our Apicella Designs Tri-Y LS swap long tube headers are one of the tightest fitting setups in the industry. Originally developed with Doug Thorley Headers for our 1947-59 Chevrolet 3100 truck chassis to use LS engines, but we have found them to work great on many more applications ranging from 1940's stock chassis Chevy trucks, C10 swaps and any other situation that requires a header that is tight fitting and allows ample ground clearance. These are built in the USA using heavy 14 gauge steel tubing and are ceramic coated inside and out for protection of the header and for better thermal insulation to keep engine bay temps down. Greatly improves performance over manifolds with our long tube design. Includes mounting bungs for 02 Sensors already on the headers. Comes with all the necessary hardware to bolt onto your LS motor including gaskets and collector adaptors. These offer a very centered collector placement to make the rest of your exhaust system easier. 

**We strongly recommend you remove the under floor brake boosters to make your exhaust system install easier with these headers if you are using them on a Chevrolet 3100 truck chassis (stock or aftermarket)**

Specs:

-American Made - Built in California to Apicella Designs specs

-14 Gauge heavy wall tubing

-1 3/4" Primary tubes 

-3/8" Thick mounting flanges

-3" 3 bolt collector built with 1/4" thick flanges

-Includes header gaskets, collector gaskets, mounting hardware & 2.5" adapter/reducer

Additional information including extensive measurement drawings & basic installation instruction are available and we STRONGLY ENCOURAGE you to read this literature and be sure these headers are the right fit for your application. Headers are not returnable after purchase, if you have any questions or need additional fitment pictures or measurements please call Apicella Designs at 602-730-5339 or email us at [email protected]