10 replies to this topic

[Bunting19]

Im looking for a bigbore cylinder head to replace the head i have now on my 1275 ! Ive got a 12g940 head onit now but looking for somethin with even more power increases !
So many to choose from but i want to keep it a 8v mini head NOT 16v or 8 port "/
Help "/ !?

[deanymini]

I've heard good things about MED, Paul Inch, Brett Sims and ML Motorsport to name a few.

I'd suggest you buy a cylinder head to suit your engine spec, rather than buying a stage 2/3/4/5 head 'off the shelf' jobbies.

[blacktulip]

longman head from AVR technologies.

[racingbob]

i bought a stage 3 head off ebay for my mg metro engine, it came off mg metro
36 x29 valves, compression bit higher than realy wanted
as its 11.1. ask what cc in the chambers

car goes realy well

buying new will cost you £600

[Wil_h]

How much have you got to spend. For me the Specialist Components 7-port will be the best and easiest to fit 8-valve head.

[Bunting19]

Cheers for all the replies people!
Ye ive been looking into all diffrent makes etc
My set up is runnin a swift tune 5 cam with 1.5 roller rockers !
Elecronic 123 dizzy ,lucas sports coil ,lightened flywheel,12g940 head
Lcb manifold with a custom inlet manifold which has been ported so they Are pretty much the same size as the gasket hole sizes and a hif44 single carb!
Ive been told it should run about 75bhp at the wheels which i would be very happy with! Got this figure from a mate whos mad on minis and has run similar set ups before over the years ! Take alot of advice off him but just looking into even more ideas an what people think
Thanks every1 keep them coming 😀

[Cooperman]

12G940 head means nothing as virtually every head fitted to a 1275 is a 12G940 from the 1970 1275GT right through to the last 1275 Minis.
What gives the better performance is the way the head has been gas-flowed, the valve sizes and the compression ratio it gives.
For best power with the cam you have you need a well gas-flowed head with 35.6 mm inlet valves and 30.5 mm exhausts, a compression ratio of around 10.5:1 and a matched inlet & exhaust manifold.

[Bunting19]

Okay thanks
Ill keep lokking into it all just confused on the diffrent heads there are ha !

[Tamworthbay]

Talk to Andy at cylinder head developments in Bromsgrove. Tell him what Cooperman said and he will sort you out. Very helpful and knowledgeable guy.

[essexdaz]

I bought a minispares mse5 head a couple of years ago for a road car when they were cheaper and vat free. It never got used and I then bought a mini 7 race car with a nackered head, the mse5 was shown to my engine builder who liked it. Last time it was on the rollers it gave 78bhp from a 998.

All the work on the head was top notch, and the ports have not been made stupidly large so it works well on the 7, not front running but ok.

[Bunting19]

Ah okay thanks for the info think im going to phone swifttune up an ask them what they recomend with my swifttune 5 cam gunna be lookin at the pricey side of it but all be worthit i hope haha