No, it had standard valves but now has larger than stock valves, installed
by me, and it's on an engine I sold to my brother in Australia. It was a 259
with an estimated 9.5:1 compression.
I used to work at a place that specialized only in Studebakers and we had
lots of engines, blocks, heads, etc.. and this engine was an exchange for a
rebuilt HP that we built for the customer. I used the engine for a core to
swap out after rebuild for my Stude.
I installed larger than stock valves. So it would appear that they are not
I can't remember all the head numbers of the heads we used but of the
combustion chamber volume on the set I measured there were at least four
different volumes, not including any R3 series heads. Of the numbers I saw
most were the newer casting with starting numbers 15 as opposed to the older
casting starting with 5. I had read somewhere that at one point, around
1962/3 Studebaker made some new molds for casting heads and also started at
some point swapping to the 15 prefix. I have seen a heads with standard
259/289 size valves with the older 5 prefix. Now I understand that any
milling of the heads would produce different combustion chamber volumes but
I am referring to heads, with as closes as possible to measure, the same
thickness of head material but with measurable difference in the depth of
the combustion area in the head. This difference was a concern to myself
because at the time I started to measure the depths for personal reference I
was assembling an engine with a set of heads for a customer with one old and
one new casting number. The heads in stock were all classified as the same
except for casting numbers. I measured all the heads with different casting
numbers and confirmed to the owner of the company that, yes indeed,
Studebaker did have many different heads and would not assemble any more
engines unless the casting numbers matched.
Some of the heads with the old casting numbers were identical to heads with
the newer casting numbers in combustion chamber volume.
I'll try to get a hold of some other numbers from Australia to see if they
are any different. The most popular head is 1557582.
I have a set of heads with 537555 from an engine with serial number V470908
indicating it's a 1960 259.
"I can't remember all the head numbers of the heads we used but of the
combustion chamber volume on the sets I measured there were at least four
different volumes, not including any R3 series heads".
I forgot to put the 'S' at the end of sets in the starting sentence.
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