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I have a set of very early Evo heads
84 A's. The combustion chamber is D shaped.
I have another set manufactured in 90? and they are 84Cs. The combustion chamber D shaped, but on both sides of the combustion chamber.
Both are crankcase breathers.
so what's the difference between these heads ? Does the later one have less CCs ? Does the later one flow better ?
Please, no guessing, I need a definitive answer. Thanks in advance ?
 

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Worthless without pics..
 

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I have a set of very early Evo heads
84 A's. The combustion chamber is D shaped.
I have another set manufactured in 90? and they are 84Cs. The combustion chamber D shaped, but on both sides of the combustion chamber.
Both are crankcase breathers.
so what's the difference between these heads ? Does the later one have less CCs ? Does the later one flow better ?
Please, no guessing, I need a definitive answer. Thanks in advance ?
All oem evo heads use the same chamber. So the set with the laid back wall have been worked on.
 

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I know that the very early heads were sand cast and later heads were die cast.
 
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