| The rules state you need to run standard 620 heads and Cams, the heads are Stamped with the coding 2S (or S2).
So it would be possible to fit heads and Barrels from a 620 to the 750SSie.
I ran my 620 on a 1.5M ECU for a year and Andy Challis did so last year winning the odd race along the way. Although the Rev limiter on them does come in a bit early compared to a 620s ECU
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