4.200 head gasket for LSX Block
07-31-2007, 07:34 AM
#1
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4.200 head gasket for LSX Block Currently, I've been told that the largest bore you can run on a LSX block is a 4.185 due to no one making a head gasket larger than this bore size. Is someone in the process of making a head gasket with 4.200 & 4.250 bores? I am sure other people would like to know this as well.
07-31-2007, 08:13 AM
#2
Cutting a gasket with a big bore is not difficult. However, when you have 4.40" bore spacing, you literally run out of room between cylinders with a gasket cut that large. Simple math: 4.40-4.20 =0.20" of gasket to seal between cylinders. You might as well seal it off with a bead of RTV silicone and hope for the best!
IMO, GM screwed up a bit when they advertised a max bore of 4.250" on these blocks. Although it sounds like alot of fun, you run into more issues than it's worth in the end.
IMO, GM screwed up a bit when they advertised a max bore of 4.250" on these blocks. Although it sounds like alot of fun, you run into more issues than it's worth in the end.
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07-31-2007, 11:40 AM
#3
Cometic has a 4.210" which is the biggest you would want to go anyway. But I woudn't consider anything bigger then a 4.185" bore for long term issues.
Like Matt said..why GM claims 4.250" bore is odd.
Like Matt said..why GM claims 4.250" bore is odd.
08-01-2007, 07:04 AM
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If GM screwed up in advertising a max bore of 4.250" on a 4.40" bore spacing, what then are we to make of claims that Darton dry sleeves can handle a 4.190" bore and that MID sleeves can handle a 4.200" bore?
08-01-2007, 05:08 PM
#5
Originally Posted by LILS
If GM screwed up in advertising a max bore of 4.250" on a 4.40" bore spacing, what then are we to make of claims that Darton dry sleeves can handle a 4.190" bore and that MID sleeves can handle a 4.200" bore?
