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SG Moto Engineering

Name: SG Moto Engineering
Address: St. Neots, Cambridge, PE196QN, GB
Telephone: +447786134476

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Machining 3 angle valve seats, valves refaced, cylinder head and block skimming, unleaded valve seats fitted, porting & reconditioning of A series Mini, Mg, Austin, Morris, Triumph Spitfire cylinder heads, piston crowns machined to size.

02/11/2026

Ready for dispatch.
Stage 3, 12g940, Unleaded.
Featuring :-
Mini Spares Race spec inlet valves 35.7mm.
Mini Spares Race spec exhaust valves 29.5mm.
MED Bronze valve guides.
MED Double valve springs.
Viton stem seals.
3 angle valve seats.
Inlet & exhaust valves ported.
Machined all 3 sides.
Ready for fast road.
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27/10/2026

Ready to Race in the swinging sixties race series.
Featuring:-
Med race spec inlets, 35.7mm.
Med race spec ex, 30mm.
Med race valve springs.
Med bronze valve guides.
Med titanium valve caps.
3 angle valve seat cut.
Polished chambers.
Valve bosses smoothed out.
Inlets and exhaust ports, ported.
New bolt kit fitted.
Ready to race.
We named this the Black Edition, because of the valves.
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16/10/2026

New Race Spec 12g940 Head, for 1293 S.
Featuring:-
MED Race spec 35.7mm inlets.
MED Race spec 30mm exhaust.
MED Race spec Bronze valve guides & Viton seals.
MED Race spec Valve springs.
3 angle valve seat cut.
Combustion chambers cleaned.
Inlet & exhaust ports, ported.
Machined all 3 sides.
Ready to race !
&spridgetchallenge, , , , , , , , , ,

09/10/2026

Ready for fitting, Stage 3, Race Spec Valves, unleaded.
Featuring:-
New 35.7mm inlets.
New 29.5mm Exhaust.
New Med tapered bronze valve guides, Viton seals.
New Med valve springs.
3 angle valve seat cut.
Machined all 3 sides.
Inlets & exhaust ports ported.
Valve bosses removed.
Ready to fit.
&spridgetchallenge, , , , , , ,

30/09/2026

Ready for its owner, just completed.
Mk3 Cooper S, 12g1805, Unleaded.
Before after pictures.
Featuring:-
New race spec inlet valves 35.7mm.
New race spec exhaust valves 29.5mm.
New MED, Bronze tapered valve guides and Viton seals.
New MED Double valve springs.
New Unleaded valve seats.
Combustion chambers cleaned.
Valve bosses smoothed out.
Inlet and exhaust ports, ported.
Machined all 3 sides.
Ready to fit.
, &spridgetchallenge, , , , , ,

25/09/2026

Before and After pictures ready to be fitted.
1275 Stage 3 fast road Big Valve head, unleaded.
Featuring :-
New 35.6mm inlet valves.
New 29.3mm exhaust valves.
New tapered valve guides and Viton stem seals.
New double valve springs.
3 angle valve seat cut.
Combustion chambers polished.
Valve bosses smoothed out.
Inlet & exhaust ports, ported.
Machine all 3 sides.
Ready to fit.
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20/09/2026

12g295, 998cc Big Valve, Mini Cooper, Race spec Valves, Bronze Guides, Unleaded.
For Sale.
Featuring:-
New Big race spec inlet valves, 31mm.
New Big race spec exhaust valves, 26.5mm.
New bronze valve guides.
New Viton seals.
New double valve springs.
New stud & bolt kit.
Combustion chambers 27cc, and polished.
Valve bosses removed and smoothed.
Inlet & exhaust ports, ported.
All 3 sides machined.
Beautiful condition.
Ready to fit,
Ideal fast road small bore a series.
, -mini, , , , ,

18/09/2026

Stage 3, fast road Big Valve 12g940.
Featuring :-
New unleaded seats.
New Big inlet valves 35.6mm.
New exhaust valves 29.3mm.
New tapered guides, with Viton seals.
New double valve springs.
New stud kit.
3 angle valve seat cut.
Combustion chambers 21.4 cc approx and polished.
Valve bosses removed and smoothed.
Inlet and exhaust ports, ported.
All three sides skimmed.
Ready to fit, fast road a series.
Please inquire, for details.
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15/09/2026

MPI, Big valve head just completed.
Featuring.
New Big inlets valves 35.6mm.
New exhaust valves 29.3mm.
New tapered guides, Viton stem seals.
New double valve springs.
New manifold studs & nuts.
New thermostat studs.
Combustion chambers polished.
Valve bosses smoothed out.
Inlet and exhaust ports, ported.
All three faces skimmed.
, , , , , , , , , , &spritechallenge,

01/09/2026

Ready for fitting.
Stage 3, clubman head, unleaded.
New inlets valves race spec, 35.7mm.
New exhaust valves race spec, 29.5mm.
New tapered bronze guides and Viton stem seals.
New double valve springs.
New unleaded seats.
Combustion chambers polished.
3 angle valve seat cut.
Inlet & exhaust ports, ported.
, , , , , , , , , , , &spritechallenge

Address

St. Neots
Cambridge
PE196QN

Telephone

+447786134476

Website

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