LS family of engines -4AN anodized BLACK aluminum Steam Vent.

Features:
(1) LS aluminum 6061 steam vents with precise fitment and high quality engineering Billet vents feature precision machining with Allen head bolt and “O” ring pressure sealing.
(2) Black anodized lightweight 6061 AN aluminum fittings provide maximum flow and do not require sealing compound or tape, one-piece reusable mandrel-bent fittings.
(3) Installing steam vent reliefs on in all four corners of the engine have been proven to limited detonation in chambers 8 and 7 specifically. A must for high horsepower engines!!!
(4)This is a high quality fitting that will flow well and be a great improvement over stock steam vent plumbing.

Specification:
Coolant Crossover
Component Type: Fitting
Fitting Type: Male connector
Fitting Size: -4 AN
Fitting Material: Aluminum
Fitting Finish: Black anodized

Package include: 1*Steam Vent Fitting
They feature -4 AN male threads and include O-rings and stainless steel bolts

Compatible With GMC Chevrolet LS1 LS2 LS3 LS6 LS7 LM7 LQ9.
Some engines need 2 & 4 depending on your specific set up.