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NE gasket set, do I need thicker o-rings?

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Seabeowner:
Other relevant things:

Has the head been skimmed, the depth of the location will be less.

The size of the hole in the head gasket.
May affect The room the O ring has to expand into, May/may not be concentric with the location in the head. Mine vary from 10.8mm to 11mm

O ring sizes available. I found:
5.0 x 2.4,  5 x 2.5,  5 x 3.0
5.23 x 2.62
5.3 x 2.4
5.5 x 2.4,  5.5 x 2.5,  5.5 x 3.0
5.6 x 2.4

How much is recommended as the maximum to compress O ring.

Bryanj:
Head skim wont matter as its flat but block skin would as there is a recess

Oddjob:
Just measured the head gasket thickness.

Genuine gasket out of top end set, difficult to measure as Honda put some sort of sticky layer around the hole and it has the effect of sort of bubbling the surface a little but 1.4mm is my best measurement.

My aftermarket kits were both NP ones, Royal Industries NP18004 to be exact. the kits were mixed together but 2 head and 2 base gaskets along with 2 sets of Orings etc, only one of which included the ones for the head oil gallery in question, no sticky layer around the opening, unlike the Honda one but both measured around 1.4mm as well. If anything I'd say they were slightly thicker than OE as they did measure thicker at times, both measured 1.5mm depending on how you read the micrometer.

All the kits were from the 80s maybe even earlier, late 70s maybe.

SteveW:
Thanks for the info guys. Pretty sure my engine has not been apart before, I only did the top end because the valve stem seals had failed. I had no other leaks.

I’m just glad I measured everything, if I had used the gasket set with the o-rings supplied I’m convinced it would have leaked.

I’ll post up my findings once I have the thicker o-rings and it’s back together.

Seabeowner:

--- Quote from: Bryanj on October 25, 2022, 09:55:44 PM ---Head skim wont matter as its flat but block skin would as there is a recess

--- End quote ---
Yes, got right in the earlier post, meant block and typed head. Dunce.

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