theay doo have a tendense to crak between the valves on cylinder 2 and 3.. but if you think abaut it.. all the abowe things you talk abaut. i dont know a engine there dont have the same problem. zetec, pinto, cosworth. I´ve only know that tuners have forgotten this engine when theay were beassy with the cosworth engine and pinto..

i have been driving with my car (sierra GT) for the last 6 years. 4 of them tuned, and i havent been saved.. i´ve been taking 3 diffs. and been driving 104k KM with it tuned and 154k km. when i bought it in 99 i changed teh head gasket. and its been driving since. it was tuned when it had been driving 170k km. and i only changed the camfollowers. it was tuned with. piper cams bd285 janspeed manifold simons 2,5" eksost and a 57I kit. then it was chipped.. 140bhp and 183NM its max are 7000rpm. and you change the gears at 1Gear 7000. 2. gear 6500 3-4.gear 6000rpm. then i put on dyno last year. then it was 135bhp. thas was after 250k KM. ive lost 5bhp.. and last year i made a 16:85 quartermile.. bad engiene?? not if you ask me. its more like a engine the tunere forgot. just becourse there were a lot of cheaf pinto engiens laying arround.. but that don mean it cant take it.. it mean that noboddy have done it.. we have a good known (in dk) tuner. he build a couple af NA dohc sierras when it was new. with 300G cams weeber karbs manifold. and mecanikle cam followers a full ballance of the crank. and then on std pistons he got 200bhp on a NA sierra dohc engiene with full relailibillity.. belive it or not. but now im gowing for 160bhp in my sierra. just with a full rebuild and a new plenium (my design) if its works its good, if not. then i have a sierra 4x4 cosworth in my garage waiting for my GT to be put on pension..and waith for trottlebodys

but sorry its not abaut NA tuning now. we have a lot of sierra DOHC with turbo or kompressor here in dk. and with a good ECU you can make 200-250 bhp in them. and i know a cople of friends with them. and theay doo okay. but build them right. 200 bhp are max on std pistons and compression.