The 10 long bolts are M8-1.25 and the 3 smaller ones are 1/4 - 20.
ARP 134-7401 LS1 Thermostat Housing Bolts 12pt Black 8740 LS 4.8 5.3 5.7 6.0 6.2
ARP 140-5402 Black Mopar V8 12pt Main Stud w Optional Bolts for Oil Pump Clear
BBF Ford 460 514 557 SFI-Rated Flexplate 164 Tooth Internal Balance W/ARP Bolts
SBC Chevy 350 SFI-Rated Flexplate 153 Teeth Ext Balance 87-99 Block W/ARP Bolts
SBC Chevy 350 SFI-Rated Flexplate 168 Tooth 87-99 Block Ext Balance W/ARP Bolts
ARP Bolts 6221750 Hex Bolt 5/16"-18 X 1.75" Stainless Steel 5 Pack
