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Jim Caughlin · 07-09-2014, 10:53 AM

The other issue in regard to being SS legal is that I believe the AFR 1399 head comes with larger valves than are legal if you want to run them as a SS replacement head. That means that you will have to replace all of the seats and valves to be SS legal. The performance drawback is that there will be a big lip under the new smaller seat, without a bunch of welding or epoxy, I can imagine the flow will suck after the seat change.

07-09-2014, 10:53 AM	#7
Jim Caughlin Senior Member Join Date: Mar 2002 Location: Woodburn, Or Posts: 685 Likes: 83 Liked 805 Times in 245 Posts	Re: Choosing a Manifold:SBF The other issue in regard to being SS legal is that I believe the AFR 1399 head comes with larger valves than are legal if you want to run them as a SS replacement head. That means that you will have to replace all of the seats and valves to be SS legal. The performance drawback is that there will be a big lip under the new smaller seat, without a bunch of welding or epoxy, I can imagine the flow will suck after the seat change.