Chamber CC

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Chamber CC

Postby h-bot » Mon Jan 20, 2003 5:49 am

From: twincams_REMOVE_553575_THIS_@yahoo.com

I have recently CC a New Old Stock (never used) cylinder head with
stainless steel valves and polished chambers and got an average of
42 CC's.

Later

Tim




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Chamber CC

Postby h-bot » Mon Jan 20, 2003 6:29 am

From: markrock_REMOVE_847275_THIS_@yahoo.com

Mike V:

The 1976 MVMA Specifications Form Passenger Car lists the following
for the L4-122 C.I. 1976 Vega on a page issued 9/75:

Cylinder Head Volume (cc) 39.67

Head Gasket Thickness (Compressed) .044"

Head Gasket Volume (cc) 7.38

Deck Clearance (minimum) (above or below block) .0025" (below)

Minimum Combustion Chamber Volume(cc) 39.2

We did some cc'ing about a year ago, but I can't locate my notes
right now, and I don't recall the results well enough to even toss
something out. I'll ask Ken if he can dig out his copy.

Mark




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Chamber CC

Postby h-bot » Mon Jan 20, 2003 7:08 am

From: doctorduke_REMOVE_509698_THIS_@yahoo.com

Good research, Mark.

The MVMA specs are part of the "restoration package" that GM will send
you free of charge. Call GM Customer Service at 800-222-1020. They
will want your VIN.

Since minimun quench clearance is .035", on a nominal engine you
should take .010 off the deck to get to minumum quench clearance and
maximmize the CR. Of course, you should make all the measurements to
know where you engine actually is in the tolerance range.

Also, don't use a Felpro gasket. It's about .060" thick, compressed.
The Victor Reinz Vega Gasket available from NAPA is .045" compressed,
but you should route out the rear coolant transfer passage on the
exhaust side to match the OEM CV gasket, and, of course, with any Vega
gasket you will need a 3/32" oil restictor since it's not built into
the Vega head gasket.

Duke




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