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rx dealer · 07-14-2017, 01:13 PM

Mike, this engine is a 396 LS3 COPO Super Stock engine. I use the extreme duty XH-432 exhaust valves from manley. A friend lost 2 engines ( 396 big block stocker ) using another top brand valve. is it the luck of the draw? who knows. fingers crossed...Luke SS 311

07-14-2017, 01:13 PM	#4
rx dealer Member Join Date: Mar 2007 Location: Lake Orion, Michigan Posts: 336 Likes: 11 Liked 53 Times in 13 Posts	Re: Hollow stem valves Mike, this engine is a 396 LS3 COPO Super Stock engine. I use the extreme duty XH-432 exhaust valves from manley. A friend lost 2 engines ( 396 big block stocker ) using another top brand valve. is it the luck of the draw? who knows. fingers crossed...Luke SS 311