comp 1.85 rockers
ported and polished 243s
on a 5.3 block with 11.1 compression
with this cam
Duration at 050 inch Lift: 216 int./224 exh.
Lobe Separation (degrees): 115
lift: 561
comp 918 springs
PTV means piston to valve clearance. If the heads are milled and depending on the valve size they could touch.
Lift would be right around .610
Max lift for the 918's are .600 or .625 if you have the newer version.
.561 / 1.7 =.330
.330 X 1.75 = .577
.330 X 1.8 = .593
.330 X 1.85 = .610
i was told with the 918s...even the old ones that i have...max lift is .620 or so. but .610 would be pushing it. may as well spend the $$ and get patriot duals to handle .650
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