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B20F?? 140-160

uid 32173's pic
posted by  Gary L on  Wed Jun 17 07:39 CST 2009
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last visit: Wed Oct 22 10:26 CST 2014
[RELATED]

"I think:
The heads without the isthmus are pre-1973.
The heads with the isthmus are 1973-1975 model heads.
The heads with double isthmus are R-Sport.
The only difference between an E & an F head is the thickness."

That may all be very true... in Australia. :-)

But in the US, I don't recall ever seeing an engine marketed as a B20F without* the isthmus. Recall an 'F' here in the US means 1972 or later, as we only got the 'E' in '70 & '71. I'm fairly certain that both (isthmus-equipped) 'F' heads I currently possess, were originally on US spec '72 B20F's.

*edited after original post to change the word 'with' to 'without'
--

Gary L - 142E ITB race car, 73 1800ES





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