Packing thickness is usually based upon shaft size. On my old 1967 Tartan 27' with an A4 the shaft is 1" and I'm pretty sure I used 1/4" packing material in there. I remember buying 3 different thicknesses just to have it covered. Welcome to the A4 community BTW; great engines if you don't mind getting your finger nails really dirty.
Hint: I only got 2 layers of 1/4" packing into our stuffing box about 6 years ago. If I had used 3/16" I might have got the recommended 3 layers of packing material. Compression from the packing nut helps to reduce the drip and compress the strips of packing.
Any racing yet on your new P30'? Pics?
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