Can any one identify this cylinder head please, 12G202
I came across it in a shed, with a full set of valves, and double valve
springs, its been ported and polished,
will it fit on a 1000cc engine,
one broken stud in T/stat housing,
Thanks
Fitzy

Hi, Fitzy,
It's an 1100 cc head. It will fit a 1000 cc engine, but the compression
ratio may be a bit lower.

keith

"Fitzy" <peterfitzpatrick (AT) btopenworld (DOT) com> wrote

Did the 1100 heads have double valve spring set up ?
Fitzy


"**" <cowpoke (AT) btinternet (DOT) com> wrote

Good if you want to "turbo" it !!!

Just slap it on and watch the thing flyLOL , I put a 1300 head onto my 1000
block and it just flies now (60+bhp from -50bhp)


"**" <cowpoke (AT) btinternet (DOT) com> wrote

is possibly either a after market set of springs been fitted or it could
possibly be a Cooper 997 or an MG 1100 head. Some of the last of the 997's
did come out with the 1100 casting. More likely to be a MG head though.

"Fitzy" <peterfitzpatrick (AT) btopenworld (DOT) com> wrote

hi,

I think the MkII Midget / MkIII Sprite had double valve springs. The
9CG engine (948cc) Spridget heads did, where the 9CC (948cc Sprite MkI)
heads did not (did they use the same heads??) .

Terry Horler's truly excellent Original Sprite and Midget book seems to
back me up on this, so it's not just my alcohol addled mind playing
tricks

Best regards,

Phil



TurboJo wrote:

hi,

I think the MkII Midget / MkIII Sprite had double valve springs. The
9CG engine (948cc) Spridget heads did, where the 9CC (948cc Sprite MkI)
heads did not (did they use the same heads??) .

Terry Horler's truly excellent Original Sprite and Midget book seems to
back me up on this, so it's not just my alcohol addled mind playing
tricks

Best regards,

Phil



TurboJo wrote:

12G202

997 Cooper, Austin/Morris 1100, MkII Midget/MkIII Sprite

Inlet 1-5/32" Exhaust 1" Chamber volume 26.1cc

Don't think these had double valve springs as standard.


"Fitzy" <peterfitzpatrick (AT) btopenworld (DOT) com> wrote

I am tempted to fit it to my City E after overhauling it,
will it make much difference,
Fitzy


"Tim" <tim_lis(NOSPAM)@clear.net.nz> wrote

"Fitzy" <peterfitzpatrick (AT) btopenworld (DOT) com> wrote

the 12G295?
Does it have any stampings anywhere? I have a 12A1456 with CAHT88 24.0
stamped on the upper surface just behind the heater outlet. I believe it's
an unleaded stage 3 with 24cc chambers, from Mini Spares, but it appears to
be based on a 850/948 casting. It's got 12G295 sized valves, double springs
and the ports are well opened up. I have't tried it yet, but with the right
induction, it should make quite a difference; need to calculate the
compression ratio first. Could be worth looking for similar markings on
yours, given the double springs and modded ports, and also worth checking
the chamber volume...
Paul