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Message: <blockquote data-quote="Wild Horses" data-source="post: 1448954" data-attributes="member: 19251">[ATTACH=full]1227[/ATTACH] We cannot get this car to stop pulling timing in the upper RPM. It didn’t do it with the last tune but it had the factory style pistons and the Vortech had a bigger pulley.  Now it’s bored .20 over with low compression pistons and has a little pulley (more noise) to compensate for them... so I bet those knock sensors have no idea what to think now. It’s basically an aluminum terminator bottom end and should be good up to 750hp. It’s getting PLENTY of fuel and it doesn’t seem to be true spark knock. Fuel supply is not an issue though. The IATs seemed a little high on the dyno but nowhere near enough to kill as much power as it is. What do I do? It’s at 9* total and still wants to pull timing.  Seems like every time I take care of what should be the “final” tuning issue, another problem pops up. It’s an 01 teksid Cobra with the forged crank, Manley rods and lower compression 9cc Manley pistons. Heads are factory 01 with port work but stock cams. Fresh rebuild on everything with about 550mi on it now.</blockquote>