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CARTER_GT
 Post subject: What head is this?
PostPosted: Mon Mar 26, 2012 12:13 pm 
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1098cc
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Joined: Wed Jun 30, 2010 8:43 pm
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Location: Melbourne
Hi all stupid me cant find any numbers to work out what this head is.

It reads:
12A 1456

heres a pic

Image

Cheers, Steve
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smac
 Post subject:
PostPosted: Mon Mar 26, 2012 12:22 pm 
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Joined: Fri Aug 26, 2005 1:03 pm
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Location: Napier, NZ
Stock 850/998 head isn't it?

Edit: yep...
http://www.minimania.com/web/SCatagory/ ... ticleV.cfm
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CARTER_GT
 Post subject:
PostPosted: Mon Mar 26, 2012 12:42 pm 
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nothing special then :? has had all the ports valves cleaned up and enlarged. Was sitting on a +40 thou 1098. It should be alright shoudnt it? performance wise

Thanks smac :D
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Anto
 Post subject:
PostPosted: Mon Mar 26, 2012 12:53 pm 
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CARTER_GT wrote:
nothing special then :? has had all the ports valves cleaned up and enlarged. Was sitting on a +40 thou 1098. It should be alright shoudnt it? performance wise


Depends... With slightly bigger inlet valves and some porting it may well be just as good as a 12G202 head, as per stock 1098 :wink:
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CARTER_GT
 Post subject:
PostPosted: Mon Mar 26, 2012 12:55 pm 
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Anto wrote:
CARTER_GT wrote:
nothing special then :? has had all the ports valves cleaned up and enlarged. Was sitting on a +40 thou 1098. It should be alright shoudnt it? performance wise


Depends... With slightly bigger inlet valves and some porting it may well be just as good as a 12G202 head, as per stock 1098 :wink:


Ohh.. :( Wish my 295 was still good..
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drmini in aust
 Post subject:
PostPosted: Mon Mar 26, 2012 1:11 pm 
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Location: near Baulkham Hills, NSW
You can port them out & fit big valves just like you can with a 202, but there's more metal to remove.
Way back when they were all we had, I used to start by sticking a 1-1/16" drill down the inlet ports. :P

_________________
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. :mrgreen:
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CARTER_GT
 Post subject:
PostPosted: Mon Mar 26, 2012 1:48 pm 
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drmini in aust wrote:
You can port them out & fit big valves just like you can with a 202, but there's more metal to remove.
Way back when they were all we had, I used to start by sticking a 1-1/16" drill down the inlet ports. :P


Im keen to do this :wink: How far down do you drill? Is it a complex task or would i be able to attempt it with the right tools?
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drmini in aust
 Post subject:
PostPosted: Mon Mar 26, 2012 2:42 pm 
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Stop before you get to the Y bit (aka a bifurcation).
Then blend the ports back in with a die grinder. Works good with 202 or 295 inlet valves.

Make sure you drill it straight in a big bench drill or a milling machine- there is only about 1-1/8" of space between the edges of the 2 pushrod holes.

If you eff it up don't worry, the world is full or 12A1456 heads. :mrgreen:

_________________
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. :mrgreen:
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smac
 Post subject:
PostPosted: Tue Mar 27, 2012 5:41 am 
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Location: Napier, NZ
What does an unmolested 202 head sell for in aus these days?
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drmini in aust
 Post subject:
PostPosted: Tue Mar 27, 2012 6:34 am 
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~$50 for a 202 needing reco, $100 up for a good one complete, with good valves still.
295s bring a lot more, but they tend to be cracked more often than 202s from my observations.

_________________
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. :mrgreen:
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smac
 Post subject:
PostPosted: Tue Mar 27, 2012 7:36 am 
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Ya I have a rusty old 295 sitting here but I'm not sure it's even worth getting it cleaned up and tested.....pretty pitted.
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