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Bill Bogues · 02-03-2015, 08:31 PM

I've run all three on my Nova.If each set was done exactly alike I don't think there is a hoot of difference in any of them.The book say's the 487 has more intake port volume but the best I have run was with the 993's.Hope this helps.

02-03-2015, 08:31 PM	#10
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 323 Likes: 96 Liked 169 Times in 53 Posts	Re: 487X vs. 487 vs 993 SBC Cylinder Heads I've run all three on my Nova.If each set was done exactly alike I don't think there is a hoot of difference in any of them.The book say's the 487 has more intake port volume but the best I have run was with the 993's.Hope this helps. __________________ Bill Bogues 4696 STK