<VV> Requesting EM help

[Bill Hubbell]

Bob, 

Until 1966 all Corvair Cylinder heads had only two 3/8" bolt holes, the
remainder were 1/4".  Since all heads are identical, except for the
placement of the balance tube outlet, the larger holes were there only for
the mounting of the generator.  Therefore, on the RH side, the 3/8" holes
end up in front of the engine, and we are stuck with 1/4" holes for mounting
the A/C compressor.  The compressor, of course, was quite heavy and tended
to put a lot of stress on these holes, often causing the bolt holes to strip
out.  Thus, in 1966, the heads were redesigned to have only 3/8" holes.

Bill Hubbell


-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of BobHelt at aol.com
Sent: Monday, September 03, 2007 3:01 PM
To: virtualvairs at corvair.org
Subject: <VV> Requesting EM help

Hi Everybody,
Memory seems to fade and having only LMs around I need to ask you your help

on only 1961-63 EM heads.
 
For a research project, I need to know about the hole sizes on the top  of 
the heads for attaching the top shroud and A/C compressor on the 1961-63
heads. 
There were only two different hole sizes used...1/4 and 3/8 inch. So if  you

would please just take a look at your engine you can readily identify which

are used (in most cases) just by looking.
 
Specifically, I need to know if there are two  3/8 holes and are they  
located where an A/C mount might go. Or are they on the oppsoite end of the
head?
 
Thanks in advance for your help.
Regards,
Bob Helt



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