First off, Its nice to see another Texas guy on here. I lived in HEB for 18 years.
Now that thats out of the way. I have always herd that using a gasket smaller then the bore diameter will cause pre-ignition, But nothing has been proven to me yet. My self, I would just go for the 4.100 gaskets and be done with it. Thats the exact gasket im using on a 355 with edelbrock heads.
Go with the 14096405 it is made for aluminum or iron it is a stainless core with graphite overlay, a very good piece and only .028 thick, it has a 4.1 bore it is made for the 4 inch bore motors and will accept a thirty over bore.
The 10105117 is the old thick composition gasket make on the 1980's gasket technology of the old L98 engine. It is twice as thick as the ....405 which aboslutly kills compression unless it's used with the 54-58 cc L98 head. Worse than that with a stock .025 inch piston to deck clearance, the .053 gasket adds up to .078 between the head and piston which just destroys the squish/quench function making an iron headed engine pretty detonation prone. This isn't such a difficulity for an aluminum head as they pull heat out faster than iron so the crappy squish/quench isn't such a big deal with them.
The 10105117 is the old thick composition gasket make on the 1980's gasket technology of the old L98 engine. It is twice as thick as the ....405 which aboslutly kills compression unless it's used with the 54-58 cc L98 head. Worse than that with a stock .025 inch piston to deck clearance, the .053 gasket adds up to .078 between the head and piston which just destroys the squish/quench function making an iron headed engine pretty detonation prone. This isn't such a difficulity for an aluminum head as they pull heat out faster than iron so the crappy squish/quench isn't such a big deal with them.
Bogie
Bogie, you may be thinking of another part number. The 10105117 shows everywhere that it is a 4.000" x 0.028" composition gasket.
The question with the gasket is whether or not to use it on a 4.030" bore. Personally, an additional 0.015" on the radius wouldn't seem to me to push the gasket out into the cylinder far enough for it to become a player in preignition, but then again, I don't have the facilities or tools to find out since retiring. I would think that the width of the chamfer that the machinist cuts at the top of the cylinder to ease the rings in might have some bearing on it.
If the 10105117 gaskets are Multi Layer Steel (MLS) head gaskets, they are for use with 1996 and later TTY head bolts and require a polished, almost mirror like, head and block surface finish.
TTY head bolts are installed by factory robotic machines that can install all the bolts evenly at the same time. That is particularly good for modern thin head castings and aluminum heads.
Okay I see now where the 1010 lists 4.000 bore, and the 140 lists 4.100 bore
So I should be fine using the 140 because my 4.030 bore is not over 4.100. :thumbup: Much appreciated all!
Glad to see a couple Texans on this thread, We all need to meet up and cruise to corpus Christi or w/e!
Brand:Chevrolet Performance
Manufacturer's Part Number:10105117
Part Type:Head Gaskets
Product Line:Chevrolet Performance Composition Head Gaskets
Summit Racing Part Number:NAL-10105117
Bore (in):4.000 in.
Bore (mm):101.600mm
Gasket Material:Composite
Compressed Thickness (in):0.028 in.
Compressed Volume (cc):5.766cc
Lock Wire:No
Quantity:Sold individually.
Notes:Not for use on engines having larger than a 4.000 in. cylinder bore.
In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site.
Brand:Chevrolet Performance
Manufacturer's Part Number:14096405
Part Type:Head Gaskets
Product Line:Chevrolet Performance Head Gaskets
Summit Racing Part Number:NAL-14096405
Bore (in):4.100 in.
Bore (mm):104.140mm
Gasket Material:Stainless steel and graphite multi-layer
Compressed Thickness (in):0.028 in.
Lock Wire:No
Quantity:Sold individually.
In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site.
This question concerning the 10105117 head gasket bore has come up numerous times. A while back I contacted Pace Performance customer service about this. Their rep physically measured one of the gaskets and this is the reply I received:
Hello Ed,
I measured the bore on one of these gaskets and they are a 4.085" so there is no problem at all with .030" overbore, would even be okay with a .060" overbore. we do have them in stock.
I would have no problem using this in a street 355 or 383 build.
Ed
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