Dunno, do you know exactly what the piston to valve clearences are?
There are a few points that it's MUCH closer than when the piston is at TDC so it might have been close enough to touch a valve when it was hot and running, I had this a few years back with my 7M and was only an issue when...
Turn the crank so the cam is on the back of the lobes for #1 then try and slip a feeler gauge between the cam and the bucket, this will be the "lash" if there's too small or no clearence it will hang a valve open when hot and cause a miss.
As our motors wear the Lash tends to close down as...
The AU/Falcon Fans I'm using have much more "plenum volume" in the shroud than that.
Not sure how well it's going to work with them that close, you run the risk of the fans only drawing their own diameter through the core.
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