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[2woody]

The Irmscher 4.0 was bore + stroke

[doz]

You may be wrong there. There isn't a lot of meat to be boring them which is why they are always stroked

[2woody]

98mm vs. 95mm 

[doz]

Oh god now I'm gonna have to go down to the back of the workshop and measure my old block I'm positive both 3.0lt and 4.0 lt 24 valves were 98. 3.6 Irmscher 12 valve was 96. Do you know how dangerous my workshop is? There's all sorts of strange and wonderful life forms down there

Where you getting your info from?

[doz]

Well I stand corrected. As they say everyday is a school day. 98 versus 95. I've got a spare 3.0litre engine I rebuilt almost 20 years ago. Back then pistons were mega expensive. The engine had covered 208 k miles. The machinist managed to find some pistons which were half the price however they were bigger dia. I ended up with a lump just under 3.1 and I had a ported head done for it. Covered around 4 k miles before I had to scrap the car. I kept the engine and it's sat in the workshop all covered up with the pots and engine filled to the brim with oil. Must get it fitted to the gsi. It went like the hairy clappers.

[2woody]

Oh god now I'm gonna have to go down to the back of the workshop and measure my old block I'm positive both 3.0lt and 4.0 lt 24 valves were 98. 3.6 Irmscher 12 valve was 96. Do you know how dangerous my workshop is? There's all sorts of strange and wonderful life forms down there

Where you getting your info from?

I have some old Opel information.

it seems they did play "musical bore sizes", especially if you include 12v and the likes of Mantzel, etc.

But as the question referred only to the Irmscher 4.0, I'm confident that the answer is 98mm ( in addition to the long-throw crank )