<VV> Holes drilled into piston crowns?!

[Frank DuVal]

You can also say the hole shows which way "front" is to the piston. All 
six holes (notches, arrows) should be on the forward side of all six 
pistons. John, see shop manual. Of course saying "faces flywheel" is 
less apt to be confusing to those people who think the front of a 
Corvair engine is where the belt pully resides.

Frank DuVal

Harry Yarnell wrote:

> A notch maybe. All factory pistons have them. The notch faces the 
> flywheel.
>
> Harry Yarnell
> Perryman Garage and Orphanage
> hyarnell1 at earthlink.net
> ----- Original Message ----- From: "John McMahon" <jmac2112 at adelphia.net>
> To: "Virtual Vairs" <virtualvairs at corvair.org>
> Sent: Sunday, August 06, 2006 7:58 PM
> Subject: <VV> Holes drilled into piston crowns?!
>
>
>> First, I'd like to thank everyone who let me know that the valve stem 
>> diameter for Corvairs is 11/32"!
>>
>> As I tear further into my 140 engine, I have discovered something 
>> strange. Each piston has a hole drilled in the top, near the edge, 
>> with a little channel carved out that leads from the hole to the edge 
>> of the piston. The holes are about 1/4" in diameter, and about 1/8" 
>> deep.  Now, this might be "in the book" somewhere, but I've never 
>> seen it, nor have I ever heard of such a thing.  Anyone know what the 
>> story is?
>>
>> Thanks,
>>
>> John McMahon
>> 1965 Monza coupe (with a spare 140 engine)
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