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Differences between L98 and LTx heads?

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Old Jan 6, 2010 | 05:06 PM
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Default Differences between L98 and LTx heads?
Is there a difference that can be overcome within the differences? Just thought I would look into wether you can mount L98 Heads (better and cheaper AFR selctions for example) onto an LTx engine.
Pictures are always a good way to show the difference.
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Old Jan 6, 2010 | 05:13 PM
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I remember Tom Wong telling me about an LTx engine he was working on that had SBC heads. Seems like the conversion price for the heads was $300 or $400.
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Old Jan 6, 2010 | 06:25 PM
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Would be the reverse of this ? Scroll down
http://www.fullsizechevy.com/forums/...gen-1-sbc.html

Would have to make coolant holes in the heads to match LTX block and redrill intake bolt pattern
Last edited by rodj; Jan 6, 2010 at 06:28 PM.
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Old Jan 6, 2010 | 08:45 PM
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Doesnt look like a lot to do, as 3-4 hundred bux is about 4 hours of work.
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Old Jan 6, 2010 | 11:30 PM
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...also have to address the fact that the LT1 intake is dry while the Gen 1 heads flow coolant thru the intake and there is a steam vent line at the rear of the LT1 heads but not the Gen 1 heads. The steam line is due to the reverse flow cooling.

Hell of an experiment to save $300 only to find out the cooling flow is fubar'ed and you overheat the engine. JMO
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Old Jan 6, 2010 | 11:56 PM
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Cheaper to buy the LTx head
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Old Jan 7, 2010 | 11:16 AM
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Makes sense to just go with LTx heads. I wish GM would have just stuck with GENI tech, for the most part.
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Old Jan 7, 2010 | 11:43 PM
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Originally Posted by steve40th
Makes sense to just go with LTx heads. I wish GM would have just stuck with GENI tech, for the most part.
Yeah. I wish they would of stuck with the Gen1 period. No opti crap!
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Old Jan 7, 2010 | 11:46 PM
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Originally Posted by 88BlackZ-51
Yeah. I wish they would of stuck with the Gen1 period. No opti crap!
I am thinking a 91 Six speed, aftermarket block, 427... HMMM
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Old Jan 7, 2010 | 11:47 PM
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Originally Posted by steve40th
I am thinking a 91 Six speed, aftermarket block, 427... HMMM
That sounds about right, or you could go with a 421.
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Old Jan 7, 2010 | 11:55 PM
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The 427 Bill Mitchell engines sound good. A friend had one here in Hawaii in his C3. Super Sweet.
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