RBS stocks steel 392 Hemi head spark plug tubes. These only fit single plug Donovan Hemi valve covers.
Fits 354, 392 and most other Hemi heads that use the factory six bolt Chrysler bolt pattern with cast Donovan valve covers. Plug tubes dimensions are 6.375" long overall, 1.250" in dia. and are made from steel tubing that is black oxide finished.
Tubes and O-rings are sold individual.
DONOVAN 417 ALUM. HEADS REQUIRE A .500" LONGER PLUG TUBE SO THESE WILL NOT WORK WITH 417 DONOVAN ALUM. HEADS.
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