Hemi head

Is there such a hemi head as an L head? If there is what’s the difference between an L head and an M head? Looking for a possible replacement but can’t find another M head. Thanks in advance for comments Dave SS/ea #1355

Hi Dave,

Not sure what a 'L' head is?

But I have both a 'M' head and a 'M2' head and they are slightly different.
Very obvious on the outside with machining marks, and the ports are way better with the 'M2'.

I believe the original 'M head' is a copy of the first 1965 Alcoa head but that seems a bit 'far fetched' after 50+ years...

Are you talking cast iron or aluminum ?

Where are you seeing the L and the M ?

That sounds like the month that the heads were cast on the original Street Hemi heads, 559, not 559-M.