LS1 heads.what year what number?

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02-06-2008, 02:21 AM

mvvette97

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LS1 heads.what year what number?

I'm rebuilding a Z28 and it has the 241 heads on it. It was made 3/1998. I didn't think the 98 had the 241 heads, I was thinking they had the 806 or something like that

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02-06-2008, 06:25 PM

5_02ls1

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yep 98s had 806s piremetar vc bolts
99-00 853 centerbolt vc bolts
a few late00 got 241s01-02 ls1s had 241s

somone correct me if im mistaken

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02-06-2008, 06:34 PM

Mike@ZMS

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Are there any differences in head flow out of the box on the stockers? I know the 241's are the "preferred choice" for porting, but Im wondering if there are any flow differences also.

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02-06-2008, 07:03 PM

Demonicbird00

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Quote:

Originally Posted by 5_02ls1

yep 98s had 806s piremetar vc bolts
99-00 853 centerbolt vc bolts
a few late00 got 241s01-02 ls1s had 241s

somone correct me if im mistaken

nope your right

if you were to compare an 805/853 to a later 01/02 241 there should def be a diffence maybe 10rwhp at most

-brandon

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02-06-2008, 08:18 PM

BayAreaSS

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Quote:

Originally Posted by 5_02ls1

yep 98s had 806s piremetar vc bolts
99-00 853 centerbolt vc bolts
a few late00 got 241s01-02 ls1s had 241s

somone correct me if im mistaken

He's right.

My 2000 has 853's
My friends late 2000 ws6 has 241's
My other friends 99 has 853's

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02-06-2008, 08:21 PM

mvvette97

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Thanks for the replies. I wonder if this 98 has a newer engine init. It also had the metal timing chain cover gasket. I was also thinking that the 98 had like a paper kind of gasket for the timing chain cover

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