It should be a 12G940 casting. The 21 is the chamber volume. Mine actually
cc'd at 21.5 cc AFTER I had .007 taken off in a freshening. Very good
performance, though, going on 6th year of service.
--- On Sun, 2/6/11,
corvallis@peoplepc.com <corvallis@peoplepc.com> wrote:
> From:
corvallis@peoplepc.com <corvallis@peoplepc.com>
> Subject: Re: [Spridgets]
Longman Head
> To: spridgets@autox.team.net
> Date: Sunday, February 6, 2011,
2:06 PM
> While waiting for an answer,
> Google Longman modified heads
>
...bill in Oregon======================
> -----Original Message-----
> From:
spridgets-bounces@autox.team.net
> [mailto:spridgets-bounces@autox.team.net]
>
On Behalf Of Larry & Sandi Miller
> Sent: Sunday, February 06, 2011 11:34 AM
>
To: Spridget Spridget; bugeye@yahoogroups.com
> Subject: [Spridgets] Longman
Head
>
> I just picked up a bare head that is supposed to be Longman
>
modified. Ports
> and such are extensively modified and highly polished. The
>
casting number is
> 2g640 (1275cc).
>
> There are some numbers stamped or
engraved on the bottom
> rear side of the
> head.
>
> 7872
> .100
> 21.0
>
>
I'm assuming that the 21.0 is the volume of the chambers.
> Any ideas on the
>
7872 and .100 ?????
>
> Any ideas on size valves to use??? How about valve
>
springs?
>
> Thanks
> Larry Miller (85 degrees on the central CA coastal area
> right now)
> Suggested annual donation $12.75
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