Some Cylinder Head Questions...
Posted 03 July 2012 - 10:09 PM
i have a few questions for you guys
1 - the guy is asking for £90 for a ported 1275 head, is this a fair price?
i've asked him for close-up pictures of the porting work done to it so i can get your opinions on how good the porting is.
2 - he also has what he describes as a big valve race 1275 head. would this work on a 998, with an uprated cam and the like? and if it did work, would the benefits be much greater than the ported 1275?
cheers, Chris :)
Posted 03 July 2012 - 11:53 PM
Posted 04 July 2012 - 04:26 PM
12g295 (998 Cooper) would be my preference but a near standard 12g940 (1275) can work well. If you're going to increase the valve lift with a cam you will need to think about pocketing the block.
from what I've read the 12g295 head and the 12g940 head provide similar results on a 998 if set up correctly, though I could be wrong? I think i've settled on using a 12g940 head anyway, simply because it'll be easier to find.
Posted 10 July 2012 - 02:06 AM
Obviously if you get the 940 then fair enough, either way theyre both much better than standard 998 heads!
Posted 10 July 2012 - 07:44 PM
With a 295 head the compression ratio needs to be measured and the head skimmed to get it right.
Posted 10 July 2012 - 09:04 PM
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