LS Engine OEM Steam Port 4 Way Front & Rear Coolant Crossover Tube

I have several of the 4 port crossover steam pipes for LS1 & other LSx engines. These came on 4.8, 5.3, & 6.0 truck engines as well as the LS1 prior to 2002.

All parts are used with typical wear. They have been removed from high mile truck engines in the Pacific Northwest, so very little if any rust is present. Please see photos for details.

Connecting the rear ports helps steam vapor escape the engine's cooling system and improve cooling of the rear cylinders as any trapped air can bleed out.

Each purchase will receive 1 of the steam ports I have available.

These parts are no longer available from the dealer and can only be found used.

Will fit any LS cylinder head coolant ports including engines in many Chevrolet, GMC, Cadillac, and Pontiac models - LS2, LS3, LS6, LS7, LSx, LQ4, LQ9, etc

I have these on-hand and ship quickly.  Typically 3-5 days to your door or less in the continental US.

I have other GM Cylinder Head steam ports available too. Check my other listings for many LS and swap parts.