L series head info

[dirtyleppa]

while working on the bluebird, brendan noticed the head casting number was different to his one.
my head is V91.
brendans head is U67, common L20b head.

i was just curious as to what the differences may be between all the different heads that the L series came out with.

[mint16]

i edited a few things above

my guess would be that you have a late model L20b head(1984 910), it may have bigger valves, higher compression combustion chambers, i would think the ports would be the same as any other L20b head though.

your head probably allows for better skids than my 910.