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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

18 Degree Heads

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Old Sep 26, 2008 | 12:34 AM
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Default 18 Degree Heads
Does anyone make 18 degree heads for the LT-1?
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Old Sep 26, 2008 | 08:29 AM
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From: LT1 land...the "409" of the 90s!
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No you have to get them converted. A few have done it. I have a set of heads but do not have them converted yet
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Old Sep 26, 2008 | 11:57 AM
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What is involved in the conversion, and what is a good brand of 18 degree heads to get?
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Old Sep 26, 2008 | 05:23 PM
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Anyone?
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Old Sep 26, 2008 | 05:38 PM
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Are you certain this is what you need??
You know 23degree LT1 heads, GM and aftermarket are capable of 9s NA
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Old Sep 26, 2008 | 08:38 PM
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Originally Posted by LT1_4_Life
What is involved in the conversion, and what is a good brand of 18 degree heads to get?
18 degree intake, and valve train, custom headers $$$$$$$$$$, if you going to spend the $$$$ either do SBC2.2 or Little CHief 11 degree heads
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Old Sep 26, 2008 | 10:07 PM
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Originally Posted by 96capricemgr
Are you certain this is what you need??
You know 23degree LT1 heads, GM and aftermarket are capable of 9s NA
Just exploring ideas... want to know what is involved


little chief 11's... got it
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Old Sep 26, 2008 | 11:02 PM
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From: LT1 land...the "409" of the 90s!
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It is definately expensive and easily 100hp more then any other LTx combo I have seen short of 2.2s
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Old Sep 27, 2008 | 01:57 PM
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Brodix makes a 18deg head with 23deg exhaust ports for standard 23deg headers....STD18x from brodix..
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Old Sep 27, 2008 | 10:09 PM
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edelbrock makes the best 18 degree castings. darts are also good, but stay away from brodix.
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Old Sep 28, 2008 | 12:38 AM
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yeah I've heard bad things about brodix
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Old Sep 28, 2008 | 12:02 PM
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From: LT1 land...the "409" of the 90s!
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Actually it is just the 18X heads that suck
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Old Sep 28, 2008 | 02:50 PM
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So what brand of 18 degree heads are we talking about? All the ones I have seen have runners to big for what I would call a street car. I'm interested myself.

I have heard the same regarding the Bodix 18 degree head. Better off with say the AFR.
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Old Sep 28, 2008 | 03:20 PM
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Originally Posted by 1989GTA
So what brand of 18 degree heads are we talking about? All the ones I have seen have runners to big for what I would call a street car. I'm interested myself.

I have heard the same regarding the Bodix 18 degree head. Better off with say the AFR.
i would go with the 9:1 compression GM performance parts 18* heads. they have 215cc intake runner heads unported, 60cc chambers and 0.080" deck height beside you can use stock headers with these GM 18* heads.

MindGame in www.camaroz28.com forums used the GM 15* heads (derived from the GM 18* heads) with modified GM LT4 intake manifold and did
540rwhp NA in a 383ci LT1 camaro but they have smaller combusion chamber of 48cc.
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Old Sep 28, 2008 | 04:50 PM
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you know LE and AI make some good stuff.....i would give them both a call....you might change your mind about going with what you want right now....our cars are capable to run 9s with 23 degree heads...why would you go through all the trouble to convert everything
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Old Sep 28, 2008 | 05:23 PM
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Maybe he wants to run 8's?
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Old Sep 28, 2008 | 05:50 PM
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The better the heads, the less cam needed
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Old Sep 28, 2008 | 06:26 PM
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Originally Posted by kinglt-1
Maybe he wants to run 8's?
then add a turbo or nos or something...thats N/A running 9s
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Old Sep 28, 2008 | 06:30 PM
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what about the brodix suck? has anyone tested them, i think they came out last year maybe.
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Old Sep 28, 2008 | 08:38 PM
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From: LT1 land...the "409" of the 90s!
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Originally Posted by kinglt-1
Maybe he wants to run 8's?

Some of us definately do


To build the 18x they cripped the side width of the port section. They are much more limited then the true 18* heads but are cheaper to use because they use standard rockers
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