The strange thing is in the Autospeed article about the design of the SR
Te engineers made an all alloy ca18de with high port heads that failed in
their noise level testing. Id love to get my hands on the ca18de in alloy
I wonder you has them now???

That article in the Wiki is ace thanks DD never knew it existed.
10kg 22lbs is a pretty big difference between the A vs E.

Id still be interested in the weight of the bottom end of an SR vs the CA.
The SR has thicker sand cast alloy block compared to modern pressure die
casting of todays nissan engines hence heavier but how much heavier than
a CA is still a mystery.