head gaskets
July 10th, 2013, 03:47 PM
#1
head gaskets
Im looking for stock steel shim head gaskets, wondering if anyone knows where i can find them? Also could substitute with any .020 or thinner aftermarket gasket just dont know where to find them.
July 10th, 2013, 04:55 PM
#3
I've found that they give you the fel pro replacement which is .043-.045. I did see that mj profromance offered a .011 head gasket, wondering if anyone knows if its still available?
July 13th, 2013, 07:17 AM
#5
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The pistons are normally .030 or so down in the hole in stock form. When you use a regular replacement gasket you now have .070+ squish, that's not optimum.
Using a steel shim gasket retains the compression and squish to the original specs.
Yes, Smitty at M&J still stocks the .011 shim gaskets.
July 13th, 2013, 11:15 AM
#10
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Join Date: Aug 2009
Posts: 333
I think Bucket is saying that by shaving the deck, the thicker head gaskets would provide the same squish, using the original heads.
Thinking more on this issue, I have to wonder how critical the issue is on an Olds.
The pistons are dished, with very little flat area on the top - just around the circumference. From what I understand of squish and quench (not very much, just internet reading), squish is basically the flat areas of the pistons coming closer to the flat area of the cylinder head, thereby pushing the gasses into the combustion volume of the head. With the piston design as I describe, I can't see very much happening in that regard.
Quench is from the (relatively) cool temperatures of the gasses left in the squish area.
Apparently, properly designed quench helps prevent detonation. Two engines with the same compression ratio, one with good quench and one without, will exhibit different detonation characteristics.
How is that small, flat ring-shaped area at the top of the piston accomplishing much of anything, either squish or quench?
Thinking more on this issue, I have to wonder how critical the issue is on an Olds.
The pistons are dished, with very little flat area on the top - just around the circumference. From what I understand of squish and quench (not very much, just internet reading), squish is basically the flat areas of the pistons coming closer to the flat area of the cylinder head, thereby pushing the gasses into the combustion volume of the head. With the piston design as I describe, I can't see very much happening in that regard.
Quench is from the (relatively) cool temperatures of the gasses left in the squish area.
Apparently, properly designed quench helps prevent detonation. Two engines with the same compression ratio, one with good quench and one without, will exhibit different detonation characteristics.
How is that small, flat ring-shaped area at the top of the piston accomplishing much of anything, either squish or quench?
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