Ok, here are a few pix for you.
The one on the left is for #1 and #4. Of course the one on the right is for #2 and #3
Look at the studs in reference to the valve stem. This is #2 or #3
You can really see the difference in this pic.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG