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Fully agreed. We learned on the hard way that any TR engine and may be MG B can't achieve great figures at the dyno if you dont reshape the combustion chambers.
Yes again there are huge dissimilarities between engines, even though they have the same cylindre capacity, when it comes to set the ignition advance.
Another detail not to neglect is if you have, or not, double ignition. A good example is the old Porsche 2.0 litre found under the bonnet of the Carrera 6 too. More or less the same. But the Carrera one has two plugs by head which makes an important difference in terms of pistons head shape and SCR ratio too.
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