No problem for me with the 1.72's and the E-cam. TFS heads say a maximum lift of .540 and the E cam with the 1.72's comes to about .538.
BTW, They don't make a 1.73 as far as I know.
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1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer