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Mike, there is ample space if you take off the manifold heat shield. I find it easiest to take the bottom nut off by hooking your arm under the coolant pipes from the expansion bottle, but then again im a tiny guy and my hand fits almost anywhere.
Gaz, with the heat wrap wear gloves! and soak...
there is a stated guideline as Jay said, but with everybodys car runing diff grade and qualities, with different temp properties, it can vary alot, even running temps and how hard you drive makes a diff.
When mine is thrased on track, pressure can be as low as 3.5 bar flat out at max rpm and...
rod/stroke ratios, acceleration rates, peak speeds.
The 7p is some 10mm shorter than the 7r, so thats a mightly low CR! lol
but it has longer rods and lower compression height.