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Ok so you are building an engine for economy. So what you want is maximum efficiency at an accessible load/rpm point. Most engines have peak efficiency from 2000-3500 rpm and high loads. Manufacturers are pretty damn good at doing that. If your peak torque is currently higher than about 3000 rpm, altering your cam timing can move it slightly. Also getting the right headers can help with that, as can induction pipe lengths (no, seriously, a tuned intake pipe can alter full load torque by as much as 10% at a specific rpm).
Porting won't hurt if you are just removing casting marks and valve stem bosses. A 3 angle valve cut might be worth a shot.
Compression *will* improve efficiency, if you can stop it pinging. Technically it's the expansion ratio that you are after.
To help with pinging you can remove any really sharp edges in the combustion chamber to reduce the likelihood of hot spots.
Special piston crown coatings are rumoured to help, but I know nothing about these.
Long story short you are building a high performance engine tuned for low and mid range operation...
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Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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