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You lost me a little, are you saying there was no B20E/F engines in the US before 1973?
The only difference between an E and the F for any particular year is the compression ratio and the settings of the MPS. The later model head is better to port if you don't want to weld or braze up the exhaust port. The earlier head flows a little better if porting is banned. The pre-injection B20 head I put aside. I have a K-Jet head, but haven't looked at it.
How's the Holden going? We won't be making any from 2017, all imports. I hope GM is going to make a RWD Commodore somewhere in the world.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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