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

LT1 head casting numbers?

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Old Feb 23, 2011 | 09:32 PM
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Default LT1 head casting numbers?
Hey I have a question about LT1 heads.
Is there any of the aluminum heads that are a better casting or anything like that? or are they all the similar?

Thanks
Aaron
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Old Feb 23, 2011 | 10:48 PM
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Lots of info on this out there- the 10128374 and 10207643 are the ones AI will port for you. the 561 castings are ok for porting, but flow best as-cast vs the older 2 castings from 93-95. If you want the best as they popped out from the factory, try the 561s. If you want porting from mild to max effort, go with the older 2 castings or go aftermarket if you prefer.
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Old Feb 24, 2011 | 08:31 AM
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Okay good to know, I have the 374's on my car now and was just curious.
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Old Feb 24, 2011 | 09:43 AM
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which casting came on the 97's?
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Old Feb 24, 2011 | 11:09 AM
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I believe 374s came in 97's.
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Old Feb 24, 2011 | 12:34 PM
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96-97 were mostly the 561s. 374 was a 93-94 casting, IIRC.
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Old Feb 24, 2011 | 12:53 PM
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Originally Posted by Gojira94
96-97 were mostly the 561s. 374 was a 93-94 casting, IIRC.
Sounds right cause my '93 has 374's.
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Old Feb 24, 2011 | 01:04 PM
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I have a pair of 374s and a pair of 643s ready to go to AI. Tax refund is for ***** this year so it'll have to wait until summer, since I also need a $680.00 stall, $300.00 for rear gears & installation kit, $240.00 rockers, $300.00 cam to make it all work.
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Old Feb 24, 2011 | 01:10 PM
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Originally Posted by Gojira94
I have a pair of 374s and a pair of 643s ready to go to AI. Tax refund is for ***** this year so it'll have to wait until summer, since I also need a $680.00 stall, $300.00 for rear gears & installation kit, $240.00 rockers, $300.00 cam to make it all work.
I hear ya, I kept thinking all winter I was gonna go ahead and get my heads done and buy a cam. Then I remembered all the little pieces that have to go with it, tune, rockers, poly locks, guide plates, gaskets, injectors, you know the rest.

Suddenly it wasn't so cheap anymore
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Old Feb 24, 2011 | 01:39 PM
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Originally Posted by Gojira94
96-97 were mostly the 561s. 374 was a 93-94 casting, IIRC.
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Old Feb 24, 2011 | 02:06 PM
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Oh, okay. Thanks for the correction. I know I had 643s on my '95.
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