Frankenstein M311 Cylinder Head - Assembled - 2.165/1.600 in Valve - 273 cc Intake - 71 cc Chamber - LS3 - GM LS-Series Valves 5" (4" w/ mounting tabs) 2 1 2 to M77MS829H30 1303LS1-3 Size:Youth 2X-Large

5" (4" w/ mounting tabs) x 1"

these are the same high quality 16 fin per inch cores that AFCO has always featured

(2) Pieces Per Package

8mm Double Silicone Construction Black Wire Rated To 600 degrees F

All RaceQuip pants feature a high-quality heavy duty Nomex ® backed brass zipper installed with a double overlap for a more secure front opening

Frankenstein M311 Cylinder Head Assembled 2.165 1.600 in Valve 273 cc Intake 71 cc Chamber LS3 GM LS Series Valves 5" (4" w mounting tabs) 2 1 2 to M77MS829H30 1303LS1 3 Size:Youth 2X Large 5" (4" w mounting tabs) x 1" these are the same high quality 16 fin per inch cores that AFCO has always featured