GM Part # 12558840
This is a short head bolt for the new 2007 L92 engine with the dimensions of M8 x 1.25 x 45. TTY bolts, never used.
I have 14 each. $1 each


GM Part # 12560745 --Overall 4 3/8"--Thread length 3 7/8"--
24 Each. $1 each



I also have the really long head bolts from the pre-2005 heads. They measure --Overall 6 1/2"--Thread length 6 1/8"
I have 14 Each $1 each

Shipping will be cheap. I want them gone. I'll sell the whole lot for $50 shipped.

If you are using a conventional LS1 or LS6 block manufactured before May 2004 you will need the long and short head bolts. If you are using an LS2 block or any LSx-based block manufactured after May 2004 you will need the revised short head bolts. Be sure you verify which head bolts you need.