Re: IML:1960's 413 Cylinder Heads/ Newer Style vs Older Style

[randalpark@xxxxxxx]

I have discovered a problem in replacing ONE of the heads on my 1960 
Imperial. The replacement head seems to be for a later engine, and has 
towers for the rocker shaft cast into the head. The earlier design is 
made differently in this respect. We see no other differences in 
specifications for push rod length, valves, valve springs, etc.

I think that the replacement may also have more valve cover mounting 
holes, but the old valve cover with fewer holes seems to line up with 
what is needed to fasten down the valve cover. I was aware of this 
difference between old and new style big block heads, but the rocker 
shaft mounting towers was something I had not heard before.

Reviewing my various FSM's and pictures in the Engine Section, it 
appears that this change occurred in 1964. Has anyone here encountered 
this? Other than the actual rocker shaft, will the head fit and 
function the same as the old style on my engine?

Thanks in advance for anyone's help/advice!

Paul W.
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