impala head gaskets
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
impala head gaskets
has anyone put these on a lt4? i think i remember reaing that some lt4 owners have. how much power does this give you? is it safe? what makes them give you more compression? please help fill me in here
Burning Brakes
Joined: Apr 2001
Posts: 1,209
Likes: 0
From: Toronto Ontario
St. Jude Donor '13
Impala Head Gasket.
To my memory, Impala head gaskets were .029 think. Felpro LT1 units are 0.039 and I believe factory is slightly thicker than the Felpro.
Someone may want to verify the factory thickness for comparison.
Someone may want to verify the factory thickness for comparison.
Drifting
Joined: Feb 2004
Posts: 1,485
Likes: 2
From: Champaign, IL
St. Jude Donor '05
I'd like to use the Impala head gaskets on my 92 to bump up compression. My heads have been decked a couple times and I'm not sure where my compression actually is now ...
I'd also be interested in knowing what the actual change in compression would be by using this thinner gasket ...
I'd also be interested in knowing what the actual change in compression would be by using this thinner gasket ...
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by 89'Bowtie
To my memory, Impala head gaskets were .029 think. Felpro LT1 units are 0.039 and I believe factory is slightly thicker than the Felpro.
Someone may want to verify the factory thickness for comparison.
Someone may want to verify the factory thickness for comparison.
These ARE the crush numbers. And factory LT1 Corvette gaskets are .049. I would assume the LT4s are the same.
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Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,008
From: Texas
I've been running them for a couple years. Imp gaskets are .029" compressed. They'll bump your static CR to 0.4, give or take .1 as I'm going from memory 
Unless you've performed other mods already, pistons on stock LT1s and LT4s are generally between .025 and .030 in the hole. Therefore, adding the thinner gaskets helps quench.
It won't net much hp...5-10 depending on specifics of the setup...but since you have to install head gaskets anyway, "why not?"
You may or may not need to tweak your timing map, again depending on specifc setup and parts.
Unless you've performed other mods already, pistons on stock LT1s and LT4s are generally between .025 and .030 in the hole. Therefore, adding the thinner gaskets helps quench.
It won't net much hp...5-10 depending on specifics of the setup...but since you have to install head gaskets anyway, "why not?"
You may or may not need to tweak your timing map, again depending on specifc setup and parts.
Racer
Joined: Feb 2002
Posts: 390
Likes: 0
From: St. Louis MO
with 96GS#007....have the Impala gaskets on my mildly modified LT1 and have been running pump gas for several months without any problem - and have been beating on her pretty good - she seems to be enjoying the punishment. 
