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Generation III Internal Engine 1997-2006 LS1 | LS6
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which head bolts?

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Old 11-05-2012, 01:42 PM
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I am putting new style (05) 243 heads on an older style (03) LQ9 block. Which head bolt style do I need? Early or late?
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Old 11-05-2012, 03:53 PM
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What bolts came out of that block?
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Old 11-05-2012, 04:10 PM
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Originally Posted by the_merv
What bolts came out of that block?
I'm going to look tonight, but I think its the long ones with the two shorter bolts on the ends
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Old 11-05-2012, 04:14 PM
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If it is in fact an 03 block you will need to purchase the early long and short bolt set. If 04 and newer they will be same length.
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Old 11-05-2012, 07:38 PM
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^You are exactly right. I have two shallow bolt holes in the block on each end
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Old 11-05-2012, 08:05 PM
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You need the early style bolts.
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Old 11-06-2012, 10:29 AM
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Don't forget to make a thread chaser with one of the old long head bolts, gotta make sure those holes are clean and coolant free to obtain a good clamp when torquing head bolts down bc you don't wanna hydrolock/break one...
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