hi can tell me how much to take off the head to get the compression up, it is a standard 998 block with a 295 head on it,i could not locate the post with this info on it but i think is was 60thou,just to comfirm this please.
Head Skim
Started by
logan
, Jan 11 2010 10:06 PM
5 replies to this topic
#2
blacktulip
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Posted 11 January 2010 - 11:09 PM
have you got dished or flat top pistons?
#3
logan
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Posted 11 January 2010 - 11:12 PM
hi sorry mate,flat top pistons.
#4
Ethel
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Posted 12 January 2010 - 12:35 AM
You'd be best off measuring it and working it out, the chances the head has already been skimmed in the 40 odd years since it left the factory are quite high.
#5
level7
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Mini Mad
Posted 12 January 2010 - 07:59 AM
I just had mine done, the machine shop measured it and took 80thou off which bought the compression up to 9-1, so as said before take yours in and get it measured first then work out what cr you want 
#6
bmcecosse
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Posted 12 January 2010 - 03:47 PM
Measure the head thickness - they all start off at 3.750" - if yours is any less - then that's how much it has already been skimmed! Also - have you done any work on the chambers - to 'unmask' the valves ? If so - then 80 thou - if not, 60 thou will be fine.
The 12G940 is of course a much better head - and needs NO skimming!
The 12G940 is of course a much better head - and needs NO skimming!
Edited by bmcecosse, 12 January 2010 - 03:49 PM.
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