L16 210 Head or L20B A87 head???

[jason]

Mike, what chamber volumes are you using for the open and closed chamber A87 heads?

My first L20b was a stock L20b bottom end with a A87 open chambered head port matched to the SU manifold. It ran fine on 89 octane ...

[datzenmike]

Mike, what chamber volumes are you using for the open and closed chamber A87 heads?

Closed..... 41cc
Open ...... 45.2cc

My first L20b was a stock L20b bottom end with a A87 open chambered head port matched to the SU manifold. It ran fine on 89 octane ...

Yeah that should be 8.4, plenty low for 89.

[jason]

Thanks Mike!