Question about deck height, LT4
Thread Starter
Pro
Joined: Nov 2005
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From: Bardstown Kentucky
Question about deck height, LT4
I just talked to my machinist about decking my block. He told me he likes to have at least .050 clearance including the head gasket. He said that parts can stretch and things can get close. I know some of you guys and a lot of other people are running zero.
I was wanting to deck it to .005 and run a .039 thick head gasket, .044 total.
Also my factory LT4 heads have been resurfaced. They removed .005 just to make sure they were good and flat..
I am trying to stay as close as I can to 10.8:1, .005 deck height will give me that. What do you guys think?
I was wanting to deck it to .005 and run a .039 thick head gasket, .044 total.
Also my factory LT4 heads have been resurfaced. They removed .005 just to make sure they were good and flat..
I am trying to stay as close as I can to 10.8:1, .005 deck height will give me that. What do you guys think?
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
I just talked to my machinist about decking my block. He told me he likes to have at least .050 clearance including the head gasket. He said that parts can stretch and things can get close. I know some of you guys and a lot of other people are running zero.
I was wanting to deck it to .005 and run a .039 thick head gasket, .044 total.
Also my factory LT4 heads have been resurfaced. They removed .005 just to make sure they were good and flat..
I am trying to stay as close as I can to 10.8:1, .005 deck height will give me that. What do you guys think?
I was wanting to deck it to .005 and run a .039 thick head gasket, .044 total.
Also my factory LT4 heads have been resurfaced. They removed .005 just to make sure they were good and flat..
I am trying to stay as close as I can to 10.8:1, .005 deck height will give me that. What do you guys think?
Team Owner
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From: Summerland B.C. Canada
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
I'm running .041" quench and would have run it at .034-.035" except I didn't want to wait on special gaskets. .040" is generally considered to be quite safe.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by LD85
I thought the stock "in the hole" was .025" (?) I could be wrong,
What does STOCK have to do with anything???
Chevy puts their OK on .035", but what is hot rodding if it isn't pushing the limits. My new engine has a zero deck and I'm still P'ed at myself that the piston isn't sticking OUT of the hole.
RACE ON!!!
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Thread Starter
Pro
Joined: Nov 2005
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From: Bardstown Kentucky
I think its unfortunate that you even posted in this thread with that kind of attitude.....
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Race Director
Joined: Feb 1999
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From: Indianapolis IN
With .025" in the hole, where is he going to get anything other than a copper gasket or a shim to end up with .050" ?
I have never found anything other than Flatout gaskets for like $150 or more a set, or SCE Copper gaskets, both of which I have personally used. Stretch is related to the piston speed and your max RPM's, so you decide.
Solution, deck it to .005" and get the stock .039" gasket and don't quibble over .002 or .003"
Race Director
Joined: Sep 2000
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From: The Top of Utah
I would take it down a lot further. A piston to head clearance of .044" isn't a tight quench. Either that or go the .005" deck height you planned and use one of the Impala head gaskets. Perfect! 
RACE ON!!!
RACE ON!!!
Thread Starter
Pro
Joined: Nov 2005
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From: Bardstown Kentucky
Do you have a part number for the Impala gasket? Right now I have the Fel Pro 1074 that is .039.
What about this one?
http://store.summitracing.com/partde...6&autoview=sku
Never mind that is for an Iron head..
Last edited by 96lt4c4; Jun 11, 2007 at 08:45 PM.
Safety Car
Joined: Apr 2003
Posts: 3,793
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From: VA
Good luck with the build, you're going to need it with that kind of attitude and that machinist...
Thread Starter
Pro
Joined: Nov 2005
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From: Bardstown Kentucky
Its guys like you who make me not want to post here. Some of us are here to learn, and do not already know everything.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by 96lt4c4
Do you have a part number for the Impala gasket? Right now I have the Fel Pro 1074 that is .039.
RACE ON!!!
Instructor
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From: Yorkville IL
Thread Starter
Pro
Joined: Nov 2005
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From: Bardstown Kentucky
I just did a search for that gasket, and Pace shows that it is for iron head engines. I guess you guys are running them on aluminum head engines with no problems? I am sure it has been talked about here before, I will do a search.
http://paceperformance.com/index.asp...&ProdID=180531
http://paceperformance.com/index.asp...&ProdID=180531