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Fitting 90.5s after 92s
bronte17 - February 20th, 2019 at 08:32 PM

Hi Guys

Hoping someone can advise. I currently have 92s and thinking about a new combo with 90.5s. Is it possible to go back in size? Thanks for the info


vw54 - February 21st, 2019 at 06:55 AM

I think you would have to make a spacer ring to fit to the lower section of the barrell so it wont cock when installed in the case

I would be measuring up the 2 barrels first

1303Steve - February 21st, 2019 at 07:03 AM

You should check but Im pretty sure they are the same external size

bevoracing - February 21st, 2019 at 11:13 AM

Gene Berg has some information buried in his web site under the "Labour" section?
My understanding is that 90.5 and 92 use the same case and head sizes.
96mm Case & 98mm head, so the 92s have thinner sealing surface & skirt, which is why people use 90.5mm
Gene says to maintain the original barrel clearances between case & head.
Says stock case has .012" to .020" clearance, doesn't say what the stock head clearance is. 
Some good stuff on that site.

Bizarre - February 21st, 2019 at 07:42 PM

They could be thick wall 92's

If so, 94's would fit

bronte17 - February 24th, 2019 at 07:30 PM

Thanks for the info all. Much appreciated.

vw54 - March 13th, 2019 at 07:18 AM

How did you go with this what was the outcome