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ls1 heads casting# JO49

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Old Dec 12, 2007 | 01:10 AM
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Question ls1 heads casting# JO49

i bought a set of heads ported and milled for my 01z28 with a casting #j049 does anybody know anything about them? are they the 2.02 intake v..thanx.
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Old Dec 12, 2007 | 08:14 AM
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thats not the casting number. your looking for a 3 digit number. 241, 243, 317, etc....
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Old Dec 12, 2007 | 10:49 AM
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Originally Posted by sroach20
thats not the casting number. your looking for a 3 digit number. 241, 243, 317, etc....
hey thanx my bad!!! there 853's
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Old Dec 12, 2007 | 07:59 PM
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in stock form

2.00 in intakes
1.55 in exhaust
66.67 cc


Stock LS1 Heads
Chamber 66.67 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 67 122 178 215 219 223 227
Exhaust 70 cc 52 97 133 156 170 176 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)

Last edited by cam1999; Dec 12, 2007 at 08:08 PM.
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