The figures show the CA weights in all forms and if you calculate
the differences between turbo and 8v to 16v heads it shows the
CA is a lightweight there isnt 25kg difference theres in my
view 5kg difference in favor of the ca18de in NA comparisons.
In boosted form depending on turbo sizes they would be similar.
The 4age block is no lightweight hence its durabilty, the CA has
no skirt and huge tinnie sump.
Would be nice to see more of the 4age beast you have Cameron and
an update once in a while of results.
The reality is very few RWD engines are going to be available in
the near future for budget racing so get what you can now as both
the 4age and ca18de are not going to be avail for ever.
Whether Toyota or Nissan Powered the results and fun you have are
the most important factors.