vortec heads

[Bruce Plecan]

Your correct on all counts.
far better to use a dished piston, to even further min the squish area, CR
permitting.   You want to get the greatest volume of gas as close to the
plug as possible.
PS   Just remember that rods stretch a far amount at high rpm
Bruce



> 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

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