LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

need help w/part number

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Old 05-10-2004, 02:57 PM
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Question need help w/part number

What is GM part number 12551483?
Are these Lt1 heads? If so what year?
Thanx Jason

Last edited by The Cartel; 05-10-2004 at 03:14 PM.
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Old 05-10-2004, 03:16 PM
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DESCRIPTION: VALVE SPRING
This single valve spring is use on 1996 LT4 Production Corvettes and ZZ4 crate engines. Technical Notes: Single spring with 1.32" O.D. and 1.22" solid height. The pressure at installed height IS 101# @ 1.78" with 332# the average rate of pounds per inch. Use with retainer P/N 10168424.
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Old 05-10-2004, 03:57 PM
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That would be one spring of the LT4 spring set, which is GM p/n:

LT4 Valve Spring Kit 12495494 [16/ 12551483's]

Also that p/n given for a retainer is an LT1 retainer [one] the LT4 retainer set is:
LT4 SB Chevy Valve Spring Cap Kit 12495492 [16/ 10212808's]
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Old 05-10-2004, 04:59 PM
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You guys rock. Where do you go to decode part numbers?

Thanx again, Jason
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Old 05-10-2004, 05:22 PM
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I just plugged in your part # at http://gmpartsdirect.com/ , but I have a lot of part numbers listed on my site.
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Old 05-10-2004, 06:42 PM
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thanks again, shoebox



Jason
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