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31B is a good head.

There is no difference in combustion chamber shape or volume between the MA10 or MA12 heads Compression adjustment is made via the size of the bowl in the piston. There is one bowl size fot the MA12, 2 for the MA10 The heads are not the same within the port areas, in all aspects they are...

PM me with a price mate. It may be, I usually won't buy old core, just make customers find them!

Get the two side by side then you'll see! The inlet tract on the MA10 is awful. The two types of MA12 both give a decent shot straight at the valve (without turning a 90 degree bend!

T5 is a pre cat MA12 cam T1 is a cat engined MA12 Cam A3 is a MA10 cam Bob's right you'll see no difference on a standard car. Keep your money in your wallet. If you want a performance cam, they come in at about £140 on exchange

Hi there. Thanks for the recommendation. The MA10 head needs to make its way quickly to the scrap bin. The MA12 head is far better and a straight fit. The earlier 31B castings are OK but the later cat model, 18B are probably better still. MA10 flywheels are lighter, MA10 fron pulleys...

I thought about posting then changed my mind :-)

I'll sell you a full MA12 gasket set for £35!

I build more MA12 engines than pretty well anybody - including for bobsp16. Maybe the Ryan asking the question is Ryan Jones who sent me an e-mail? 100 thou is too much to take off an MA12 head - fact Autograss engines may not use modified cams. All fuel/air has to pass through a 32mm...

Heads are different but interchangeable. Gaskets are not interchangeable. Use an MA12 head on an MA10 ok but use an MA10 head gasket

Skim 100 thou off the head at your peril! Dave www.dw-engineservices.co.uk

Further to the above - I would suggest that fitting 2 head gaskets is a bodge that's likely to fail quickly! they are not the best of things when theres only one fitted! If you need lower comprssion then do something with the pistons - or even the head.

The bolts are re-usable on the K10. Many of the older Japanese engines, from all marques didn't use stretch bolts. K11 uses stretch bolts. I didn't know ARP did a replacement bolt for the K10 (in any area) do you have a link? In which area did Nissan "over-engineer" the K10 engine? In my...

I have a few sets of MA12, 0.5mm oversize pistons. I've had them done as I do quite a few of these engines for competition use. £230 a set, delivered in UK. Overseas a bit more. (I have them on e-bay at slightly more to cover their fees). Contact me: www.dw-engineservices.co.uk Hope...

I will if I get chance. Keep hearing about the forum from customers and was prompted today to join. Someone with a March had picked my name up from somewhere on here and rang for a bit of advice.] See my site (never up to date tho'!): www.dw-engineservices.co.uk :p

..... and as one of the most prolific K10 Micra engine builders in the Uk, I've balanced dozens of Micra flywheels and used hundreds of secondhand flywheel bolts and have yet to suffer a failure (not wishing to tempt.....)

Ah, my first post on the forum :laugh: BTW, you don't need new flywheel bolts on a K10 or K11 Micra - fact Oh and the flywheel pictured (obviously not a Micra flywheel) has not got a "steel band shrunk onto it" - it is a billet steel flywheel. There is no problem whatsoever in...