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44mm intake ports with 42mm exhaust ports is a problem for naturally aspirated engines. .70 to .75 ratio shows your exhaust ports are too big. You're losing exhaust velocity. IMHO, the heads are boat anchors.
On edit, after reading my comments, they're a bit harsh. Sorry about that... but I recommend getting new heads.
Last edited by roblav; 08-29-2021 at 10:17 AM..
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