Zippy, I had the understanding that the latest aluminum heads sold by MP with standard valve sizes were “fixed”, meaning they had no issues as the earlier ones did. Date codes on the packages were around 2012-2014 I think. Have you heard this or not so?
Zippy - for reference - the part number is P5153875, package date 3/31/14.
There was a pallet of these at Sherwood back around 2016, I think about a 125 of them.
