Well i have finished modifying this 12G940 Head from a 1100S morris
Ported and polished to what i think is neither too much or too little
New Valves and Bronze guides
Double valve springs
Exhaust seat inserts
MED 1.5-1 roller tip rockers
Extra holes drilled for Cooper S
She is all ready to be fitted

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1970 MK2 Cooper S

Looks nice. Watch those bronze guides though, Minispares phosphor bronze ones tend to close up when fitted and need reaming. Then when run up to temp they can shrink further.
I had to ream mine, twice, with a 9/32" solid reamer. Once when built, then again when a valve started to grab. OK since. Now done 50,000 miles.

Other suppliers may have better bronze guides..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi Doc
Yes they got the reamer treatment as per the instructions that came with the guides
When you do it yourself it gives you a scene of achievement
That's until it craps out on you and you wish you had someone else do it

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1970 MK2 Cooper S

You didn't get rid of the horrible bypass system after all that beautiful work

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

Looks great [SMILING FACE WITH OPEN MOUTH]

Very nice

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1968 Morris Mini Cooper S

A bypass hose is fine with decent hose. I use Pirtek MPH 08, hydraulic return hose, ,500 psi.
With a brass nipple it should outlast the car.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I like to keep things original looking
And my car didn't overheat even in hot weather

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1970 MK2 Cooper S

Here is the head with the extra bits on it
Seeing if everything fits

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1970 MK2 Cooper S

When we put these rockers on Jenk's S motor they needed 2mm packing shims under to get adjustment.
This was on a Mk1S head.
Nice rockers though!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.