ok, so yes, i still am quiet the noob....

just curious with wats the difference with heads, i have a 1098 engine but i see people throwing in 12g202 and 12g295 and i have no idea wats the deal-io here.....

please help..... dont laugh.... lol...

another thing, is it possible to convert from leaded to unleaded fuel using the stock head?

cheers,
matt

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

yes you can have unleaded seats fitted to your current head.

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A standard 1098 has a 12G202 head. This is also the head fitted to most 997 Coopers and mk2 Sprites. It has square intake ports and 1.156" inlet valves.
a 12G295 head was fitted to 998 Cooper, Mk2A Sprite and MG1100 (UK). It has bigger square ports, 1.219" inlet valves, and a much better chamber shape. It's the best smallbore head BMC made, but chambers are too big (giving a low C/R) unless running flat top pistons.

A 202 head can be modified to perform just as well or better than a 295 one. See Russell Engineering in Sydney.

To see which head you have, remove rocker cover and look for numbers CAST on top of head, under the rocker gear.

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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.

cheers doc!

you have yourself a very merry christmas!

_________________
Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson