> yeah the injesctors are black tops, they flow the same as the blue tops

Blue tops spray in a single cone. Black tops spray in a dual cone pattern.
Otherwise same sameness.

> I've seen the vitara pistons but in the D16A3 motor i have they yeild a very low
> compression ratio due the the much larger combustion chamber

I think FJT distributors now do a longer conrod which recovers a lot of the lost compression ratio.

If you've access to a machinist, it's supposedly possible to rebush B18 rods from 21mm to 19mm piston pin. They are slightly longer than d16 rods and are another route to recover the lost compression ratio.

I THINK it may be possible to source YCP Vitara pistons with a 21mm piston pin.

YCP make Grand Vitara pistons which are 75mm, 21mm wrist pin. But it's a long time since I looked at that stuff.

nothing wrong with forged pistons though.

Nick.