9 replies to this topic

[flip_paint_mini]

hi all if i wonted to sell my 11 stude head how much do u think i can sell it. i no there are not many around.

i also have a 9 stude head how much could i sell that one for

[Jammy]

Depends what other work has been done to them, small bore/big bore/ and particular model of head, 12G940??

[Guess-Works.com]

Pretty much all 11 studs are 12G940 unless they have had the extra holes drilled. But what is more important than the 2 extra stud holes is the size of the valves and any porting work, as Jammy has said. Also do you expect to sell the head with Valves springs, collets and rocker gear.

If your going to whack it on to ebay, strip it, clean it and put back together you'll get more for it.

[flip_paint_mini]

so how much do u think that i should start
the bidding

[Dan]

You still haven't said which head it is!!!!

There are many different 11 stud heads, and it might not even be original.

[flip_paint_mini]

the 11 stude head is 12G940 and the 9 stude head is also 12G940 i dont think :fear: any thing else has been done to them

[SCURVY DOG]

as dan say there are many heads

original mk2 cooper s heads have a different casting number can't think of it at the minute and the inlet/ehaust face is sculptured not flat the same as the 1100 12g202 casting

mk 3 copper s heads where 12g940 heads but where stamped by the thermostat housing 12g185

you can make any 9 stud head into a 11 stud head in about ten minutes

the extra holes are in the head gasket just a case of clamping on to a head and

drilling with a pillar drill then drilling the block to suit

have done this many times over the years

so if they are 12g940 heads need to check for other stamps also the valve sizes as s heads ran bigger valves

[Dan]

Exactly 12g940 is just a casting number, as in the code for the tool which casts the bare unmachined head. You need to know which car this originally came from and what spec the head is. Measure the valves as a starting point and put the sizes up here. Someone will give you a list of diferent engines those valve sizes were used in and you can try to work out which engine it comes from. Then you can find out what it's worth.

[Jammy]

Hmmm, might be getting too bogged down in details?! I've seen plenty of heads being sold based just on there casting number. Although, if you were to find it had had modifications then you can push the price up a bit!

[Guess-Works.com]

Here's a starter for 10...

First of all there are two basic castings of a 12G940, one which has a flat top, and one which is waisted around the outside., especially noticable arounf the themostat, later ones are also identifiable by the absence of the bypass behind the thermostat on the under side.

Cooper S heads were 11 stud on High compression engines, and had inlets of 1.4" and exhausts of 1.21", these heads were also used on Austin 1300 GT's but had smaller 1.15" exhaust valves. The 1275 GT used a 9 stud head with smaller inlets 1.3" and exhausts 1.15"

I dont think any A+ blocks were ever drilled as std with 11 studs, therefore all later heads with 11 studs have been modified, and only the MG, 1275 Sport and VP metros have the bigger 1.4" inlet, valve.

Piccies... Big valve late MG Metro head ( notice the waisting ) 9 Stud



GT head 9 stud



1300 GT Head ( 11 stud small exhaust )



Sorry, wish I had a picture of a Cooper S Head,