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Home > 998cc > 998cc with 12G940 project


3 Posts
Member #: 11961
Junior Member

Hi all,

I have bought a 998cc with 12G940 head already fitted but immediately decided that the engine needs a rebuild.

While I will be at it, I would like to get out some more power out. What suggestions do you have regarding:

- Camshaft (shall I go for the Kent 276?)
- Valve Rockers (Will 1.3:1 be ok?)
- Valves (are there anything else apart from the standard valves?)
- Pistons (will it help to enlarge the bores? and to what size ideally?)

Any feedback from anyone who has gone through this process already is greatly appreciated!

Pete B

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70 Posts
Member #: 11548
Advanced Member

Calne Wiltshire

First thing that I would suggest is check the engine number on the block is it definitely a 998 with a 1275 head or a whole 1275 engine?


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9254 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

This is what I'd do

+40 overbore using something like

Other pistons are available depending on budget.
276 cam
1.5 rockers
Standard valves
10.5:1 CR
all the other decent stage 1 stuff

Should net 55 to 60 bananas and rev to 7k safely, nice.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

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