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B20F?? 140-160

uid 37336's pic
posted by  B20Paul. on  Wed Jun 17 06:22 CST 2009
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last visit: Mon Oct 20 10:54 CST 2014
[RELATED]



I have B20A & B20E heads that look like the 2nd head.(with & without injectors holes of course)

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.

The heads without the isthmus have an exhaust port floor which raises up roughly 1/8" from port face to the seat. They flow better than the other type when left stock.
The heads with the isthmus have an exhaust port floor which raises up roughly 1/4" from port face to the seat. They flow worse than the other type when left stock, but are much better after porting.

I raise the floor of both.





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