Dx to Si

I want to convert a D15 to a Si by doing the simple head swap. But How strong is the D15 block? Is it as strong as the D16a6 block? Will the compression be lowwer?
Need some info thanks.

Would be easyer to swap manifolds (convert to mpfi) and put an si cam in it than swaping the whole head. Alot cheeper too.

^^^what he said

you don't convert from dx to si by swapping heads. you need to do the MPFI conversion if you want the HP gain.