Question about head casting numbers...
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Joined: Apr 2003
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From: Surf City, NC
Question about head casting numbers... What are #241 heads? I thought these were LS1 heads.
What are #243 heads? I thought these were LS6 heads.
What are #908 heads? I thought these were 6.0L heads.?.
I dunno am I screwed up.
What are #243 heads? I thought these were LS6 heads.
What are #908 heads? I thought these were 6.0L heads.?.
I dunno am I screwed up.
TECH Resident
Joined: Jul 2003
Posts: 834
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From: Marysville, OH
799 casting is a preproduction ls6 head, there is 2 casting companies that gm uses, one is in mexico and they are a sand cast version, the other in canada is a premold version. the 853,806, 863, 817 and 799 are from mexico the 241, 243,706,035 are from canada. I have seen the 799 casting and they look identicle but they flowed a little less than an 243 casting, I think if ported you will see the same results as the 243
as stated 241 castings are the best flowing 5.7 heads over the 853's and the 806. 706 5.3 heads have smaller intake vavles 1.89 vs 2.00 on the 5.7 heads. CC on the 5.3's is smaller, if you get some 5.3's you'll want them ported and outfitted with bigger vavles to get the most out of them. due to there smaller CC they yeild a 10.8 CR IIRC.
I found a thread about the 908 casting, which might help explain why I/you are confused about things."908 is 806 upside down"
https://ls1tech.com/forums/showthrea...&highlight=908
