[junglejustice]

There are a few misconceptions here regarding 12 valve flywheels... In addition, you guys should also try to consider the 3 main issues with regards to these flywheels - separately;

1) There is a balance-factor unique to each motor that should be taken in to account! Regardless of the thickness of the actual wheel, or spacer/no spacer on the back, regardless of how far it sticks out, or whether the starter is going to engage or not - the balance-factor in principal is different between a 2.5 flywheel and a 3.0 flywheel. In addition to that basic difference in the actual casting, there are also individual balancing-drillings unique from one flywheel to the next (even within the same "type" of flywheel!)

2) The 3.0 flywheels have a 4mm thicker spacer in the casting on the rear to clear the back of the block! They are easily recognizable because of the thicker spacer (where the flywheel mates to the crank) however, some 2.5 flywheels from the later cars are suspected to HAVE THAT SAME SPACER and can easily be mistaken for a 3.0 flywheel! This is why I asked the original question! Just because it has the spacer in the casting DOES NOT make it a 3.0 flywheel!

3) A 2.5 flywheel CAN be spaced out with an individual spacer-plate between the crank and the flywheel - just like a 3.0 flywheel and it'll work just fine however, now we're back to talking about point number 1 above - the balance-factor. If you were to rebuild an engine (for ultimate conversion in to a TA car), you could just use ANY flywheel and have it balanced with the crank, pistons, rods and the crank-pulley. Just use a spaced-out flywheel (or an individual spacer to a non-spaced flywheel) if you are running a 3.0 block to clear the block and you're good to go!

Any way, I know that Jes simply took a 2.5 flywheel - one WITH the spacer - and bolted that to the rear of his "S" 3.0 engine to make the conversion work in his "Roxanne" Milano track-car (without having the motor rebalanced.) It works and yet at the same time, the cleanest way would be to rebuild and rebalance the motor with whichever flywheel and crank-pulley you are about to use.

In the case of the 24 valve conversion (without opening it up), you HAVE to use a 3.0 flywheel specifically - not for the spacer, but for the balance-factor, OR you have to have the internals rebalanced with the flywheel and the crank-pulley.

So, back to my original question, anybody have the actual numbers stamped on a 3.0 flywheel for me, versus those stamped on a 2.5 flywheel please?