Phil,
According to a Volvo Service Bulletin I have from October of 1967,
your engine type (496816), is a 90 horsepower B-18D. That was delivered in both the PV544 and the 122 Amazons. Those most likely came with twin S.U.'s.
The other number sounds similar, despite the missing "4", and I believe the 27935
is the actual serial number of your particular block.
BTW, a "496815" would be also a 90HP, but for a Borg Warner-35 automatic 122.
The number "496817" makes the B-18D an 108 HP from an 1800.
Hope this helps, and I could scan a copy of this bulletin if you need it.
Richard
email; peevee444(at)gmail.com
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