As Begbie has posted, the dimensions were already on the Group Buy thread, and Pro Alloy supplied them to me for publication, so no harm done
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TBH, having the core dimensions doesn't really compromise any research that Pro Alloy did, other than knowing what size you can fit on the car. The core efficiency will surely be dependant upon the size, depth, density and type of core used. Pro Alloy use a fairly free-flowing one, to maintain air flow to the radiator, which is made up by someone locally.
Phil