Ok, found the answer. What I got was just the standard ARP part # 234-2501 SBC - 13/16 head but it came with a stock LT1 washer. LT1 washer is smaller diam and also thicker then a stnd SBC so you need the washer so it doesn't bottom out in the crank.
If you're running an after market balancer such as a ATI then you may need to cut 1/8" off the bolt as well.
JB
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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