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B20F head: how much to remove for compression? 120-130

posted by  Gary L on  Wed Jul 20 04:56 CST 2011
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last visit: Wed Oct 22 10:26 CST 2014
[RELATED]

If (I repeat... IF) the combustion chambers on the E and F heads are the same basic shape, the shop manual numbers would indicate...

B20E - 3.34" head thickness, 10.5:1 cr
B20F - 3.42" head thickness, 8.7:1 cr

... and since you're essentially going after a cr that is the midpoint between the two stock examples, it would appear to calculate a target thickness of around 3.38", or about .030" off your current thickness.

FWIW, I have measured stock B20E heads at around 46cc, so our combined math seems to correlate fairly closely.
--

Gary L - 142E ITB race car, 73 1800ES
BlueBrick Racing Website
YouTube Racing Videos






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