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If the c. head is that good then it seems to be useless to “improve” it by shaping and polishing further on, but bigger valves, 4 throttles instead of only one --- has it been done on that engine, too. ? I know some shapers who are very experienced to improve that Rover- engine most of over here still have in their Elise.:D

Rüdiger
 

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The K24A engine (87 mm x 99 mm in standard form, so 2,354 cc.) with aftermarket cylinders (Darton, bored 90 mm diam. ) and some other aftermarket components will produce the best powerplant for the Elise . Wait and see.- until your Toyota engine is finished by--- )

BTW: The K20A head outflows all 2 litre heads except the F20C head, but the F20C head has larger valves. Using the same size [2 x 36 mm] the K20A head flows the same as the F20C, which is better than any 500 cc/ cylinder head.
 
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