Quote:
Originally Posted by cgarr
We always use the 12mm plugs for the second and use a very small relief, one cc or less may be about right, then if you take off 3 to 5 thou off the sealing surface it may be about a wash.
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I twin plugged a 2.7 head with the big plug recess volume like the one above once and ended up with a 69 cc combustion chamber volume. It's hard to make a high C.R. starting with that.