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 Posted: Apr 9, 2019 02:27PM
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smallbore 12A185 was the first of the 997 heads.  There was a Cooper S head which also got stamped 12A185, not the same head.  12G202 and 12G206 are similar, one has intake manifold rings, the other does not.

 Posted: Apr 9, 2019 09:05AM
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I thought this head, the 12G202, was the head for the 997 Cooper? I haven't found anything about the 12A185 being put on the 997. On the cylinder heads indentification page here on MiniMania it says that the 12G1851 was put on the 997. In the old MiniMania parts catalogs from the 90's (when they were in Milpitas Ca. and Nevada City Ca.) it says the 12G202 was fitted to the 997. No mention of the 12G1851 at all. 
The 95' parts and accessories catalog from Seven says the same about the 12G202 with no mention of the 12G1851. I guess it's possible all three could have been installed? I just haven't seen anyhting about a small bore 12A185 head. Do you know of any site I can read about the small bore 185 head? Where did you find out about it going on a 997? 


 Another mystery for me is that I have a couple 12G206 heads and a 12G295 that I have had for years and everybody says the valves are the same size but the 295 valves are bigger. Both heads look stock to me with original seats and measure 2.75 thick. Maybe the 295 is a later head? 206 has no locating rings where as the 295 does. Is it possible the heads had different applications with different valve sizes?

 Posted: Apr 9, 2019 08:21AM
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I was wondering that too but all I have found are longman heads with markings like the 12A185 head has on it. 

 Posted: Apr 8, 2019 12:44PM
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US
The 12A185 is indeed a small bore head.  An early casting for the 997 Cooper.

 Posted: Apr 8, 2019 03:42AM
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CA
Wild guess: might the head with L.R.A. COMP be a Longman head?

.

"Hang on a minute lads....I've got a great idea."

 Posted: Apr 7, 2019 01:14AM
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I recently bought a couple 1275's from a longtime engine builder at Sonoma Raceway in California that was moving his shop within the raceway. Basically he was clearing out his shop before the move.  Included with the engines were a pile of heads he had. Both small and large bore. There are a few that I am not sure about. I can't figure out how to insert images within this post. It seems that I can only drag or drop them in the column to the left. Hopefully they load.
The first head is a small bore with casting #2A629. It has been ported and the chambers worked along with bigger valves I think.  There are a couple of markings on the head that I am hoping somebody might have some information about. L.R.A. Comp. is stamped on top of the head on the heater valve end. Near the Thermostat is a small CG stamp. I also noticed that this head doesn't have a spot for a temp sensor. Does anybody have any information on this head? There should be 5 pictures of it. 

Next is a 12A185. I haven't been able to find out a lot about this head. Everything seems to lead towards a Cooper S head but this one is a small bore. This head has been worked as well. In fact out of the 9 or 10 heads only 2 or 3 aren't ported and polished etc. This head also has markings on the top of it near the heater valve. I think one is the amount milled off the head and the other is chamber size. The third number would be a serial number?  I think it is an early Longman head? Downton? Both the intake and exhaust ports have been worked a lot. Somebody sure spent some time. There should be 5 pictures of this head too.


Any information about these heads would be greatly appreciated. 

Thanks,

Brian