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Apr 4, 2007 | 11:12 PM

#1

JT Metal

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Melting Slicks

Joined: Mar 2006

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St. Jude Donor '12-'13

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843 head

Just curious, what does this casting number on an LS1 cylinder head mean. Good or Bad.

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Old

Apr 5, 2007 | 09:39 AM

#2

chaase

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Joined: May 2003

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From: East Meadow NY

St. Jude Donor '12

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Quote:

Originally Posted by JT Metal

Just curious, what does this casting number on an LS1 cylinder head mean. Good or Bad.

nothing other than that it is an LS1 head.

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Old

Apr 5, 2007 | 09:49 AM

#3

Pwrtrip75

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From: Janesville Wisconsin

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Yea there is other LS1 castings. One has perimeter bolts and one has center bolts for the valve covers. 24X? cant remember off hand, but I have both sets at home.

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Old

Apr 5, 2007 | 09:54 AM

#4

Billdog350

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From: East Hampton CT

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873 and 241 are LS1 heads, 243's are LS6.

Early Ls1's were perimeter bolt 873's. Later years had the higher flowing 241's with center bolts.

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Old

Apr 5, 2007 | 11:55 AM

#5

Mike94ZLT1

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From: In the pit, trying to love someone.

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853's were center bolt, pre 241 castings

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Old

Apr 5, 2007 | 02:46 PM

#6

Pwrtrip75

Racer

Joined: Nov 2006

Posts: 380

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From: Janesville Wisconsin

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Quote:

Originally Posted by Billdog350

873 and 241 are LS1 heads, 243's are LS6.

Early Ls1's were perimeter bolt 873's. Later years had the higher flowing 241's with center bolts.

Thats what i meant....241s. I couldnt remember.
I dont think the flow differences are enough to get excited about.
between the 2 LS1 heads.

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241, 843, c5, casting, corvette, cylinder, flow, gm, head, heads, ls1, number, ported, specs, year

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