Sorry Jano - your talking crap mate....

Reason most 1800CVH Sierra's are somkey old pieces of shit are cos most are ragged to fuck or over-used workhorses and the rings are fried and valve stems fooked, and power wise the reason it is held back behind the XR3i's and the like is cos of the shitty CFi fuel system (and also the head has crap flow properties)

I have seen rebuilt 1800 bottom ends mated to the XR2 1600 head with a few choice mods (zorst, filter, re-jet carb, cam) make over 150/160bhp, which not a massive lot compared to what you'd get with those mods on a std 1600 block, but the torque was 20-25%higher than you would get normally - and torque is what matters

True they don't rev as well as the 16's due to the long stroke - so change the box. Put an early mk3 XR3 box in there - they have much lower ratio's and whilst it won't let you get 60 in 2nd gear, it does let you whip thru the gears faster

Pikie - get over to Interford Forums and post up there mate - you'll get far more "usefull" info for what you want mate