Quote:
Terry at Manton told me min of 10 thou.If deflection occurs,the heads will act like guide bars. 
That`s how it`s been working w/my rpm heads. I saw that they were close but figured that it was a built in guide bar of sort and so far after many street miles, passes and 5+ years it must be ok. Granted they were CLOSE but not touching as far as I can tell. 
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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