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Good morning HS30-H. While I understand and respect the Japanese Industrial Standards as a member of the SAE I'm expected, no required, to reflect the prejudices of that organization. Do you know Len W? He lives near Tunbridge Wells. Currently he drives a red left hand drive 240. Cheers

If you go straight to a temporary tank it will tell you which half of the system is the problem. That will speed up your diagnosis and reduce wasted effort

Diplomatic and pragmatic. However I've got a hunch that a stickler like yourself would have a nice set of JIS screwdrivers in a secret compartment in his toolbox. Your secret's safe with me... I've known Len for something over 25 years at least. You'll be pleased to hear he's in fine form but still getting used to the peculiarities in character of his recently restored HLS30U, which he says were something of a shock to the senses after 40+ years of S30-series Zs with their steering wheel on the right side... 🙂

JIS, please.

My 73 Z had a L26 block and an E88 head when I got it. I rebuilt it 8 some years ago, flat top pistons, but no mods to the head. It runs great, and a blast to drive. It will ping on regular, but not 91 gas.

Stock head……surprised at how much fun it was to drive. Won’t compete with my other Z’s, but much better performance than I was expecting.

That looks good! Always nice to have a nice surface to work off of