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Bryan Broaddus · 07-26-2009, 07:45 PM

I have run the 1971 425 HP LS6 with the 401 alloy heads for several years. You can angle mill the heads to get the chambers down to 104 cc's. Same thing on the Iron heads. You have to cut .100 off the plug side and 0 on the manifold side, then correct the intake manifold face.

07-26-2009, 07:45 PM	#8
Bryan Broaddus Member Join Date: Jun 2002 Posts: 104 Likes: 2 Liked 18 Times in 4 Posts	Re: 396/375 Replacement cyl head I have run the 1971 425 HP LS6 with the 401 alloy heads for several years. You can angle mill the heads to get the chambers down to 104 cc's. Same thing on the Iron heads. You have to cut .100 off the plug side and 0 on the manifold side, then correct the intake manifold face. __________________ Bryan Broaddus 7568 STK ,SS