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B20E vs B20F 1800 1973

posted by  Phil S. on  Sat Mar 8 19:08 CST 2014
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last visit: Fri Oct 24 13:18 CST 2014
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In the U.S. market, we saw at least four different injection head castings:

1) The original '70 E, which has 11 fasteners holding the manifolds on, advertised at 10.5:1 CR using a .030" gasket (chambers around 48cc)

2) The second E (used for all '71 models and [possibly phased in earlier) using 9 manifold fasteners, same CR as the original

3) The first F used for '72 and '73 models with D-jet, 8.7:1 CR with a .050" gasket, chambers around 57cc. The '74 K-jet head is the same casting, just not drilled for AAV or coolant temp sensor

4) The final F head for K-jet in the '75 240. The bridge around the center head bolt extends around both #2 and #3 injector ports. I think it's functionally identical to the '74, but I've never worked with one. Maybe it's tapped for metric fasteners?






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New B20E vs B20F [1800][1973]
posted by  Chris Mullet subscriber  on Wed Mar 5 23:42 CST 2014 >


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