The YE motor was listed as 9.2 compression which in reality was more like 8.6.
The 11 heads would be more like real numbers of 8 to 1.
This shows up in the factory rating of a 10 Hp different between the two motors which sounds about right.
Either way with these motors and your rear gearing I would not run anything more then a cam with a advertised intake duration of 270, or no more then something like the factory 066 cam.
Also no more then .450 to .460” lift.
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