Has anyone checked the aftermarket piston suppliers ( KS Winston etc )???
I would think that somewhere in the world, GM does a 1.6 OHC (small block) with low compression for use with cheap fuel (South America would be about right). This would be a cheap mod for turboing.
If you get pistons for a 1979 Astra 1.3 ohc, the comp. is about 8.2 to 1 these would be great in a turbo conversion on an sr.
Also, Has anyone tried using bits off the Isuzu 1.7td as fitted in the Astra/Vectras? Outwardly it looks very similar to the 1.6 petrol lump.