vortec heads

[Tedscj at aol.com]

One more thing that I have heard is very critical with SBCs is the clearance 
between the top of the piston and the flat machined part of the head (I think 
this is what they refer to as the 'squish' area).  This should be kept to a 
minimum.  I have heard that putting in thick head gaskets to lower the 
compression ratio will actually cause MORE detonation due to having increased 
this clearence.
I probably got some of my terminology wrong, so somebody please straighten me 
out!
Ted
 


> I'll tell ya, since I can't get the GN to detonate (with what I call a
>  reasonalbe tune), next motor is gonna be a 9 or 9.2ish CR job (with barrier
>  coatings).....
>  The Regal has flat tops for 9.5 with a 56cc chamber (AL), and that is
>  another one that is another one that is real hard to detonate.
>  
>  The GN has run 20d timing at 20 PSI of  boost on 92 Octane, and only once
>  did it tickle the K/S and that was on the 2-3 shift for 2d.  40#er
>  injectors.  I think the smooth chambers, and 195 operating temp with the
>  cooling system right are the big answers here.
>  Bruce
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org