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#13
02-15-2022, 09:59 PM
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If that is a Butler cam he typically uses Comp Xtreme Energy lobes. If they are lobes 3317 & 3318 then your valve lift with a 1.65 ratio would be .594" / .618".
You might consider Comp QXI lobes listed on page 24 here: https://www.compcams.com/lobe-catalog They would raise your valve lift to 0.658" which would better take advantage of your cylinders heads. If these are Butler heads I suspect that 340 cfm number is at 0.700" lift.
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