NOTE HEAD ALIGNMENT DOWEL:
UNIVERSAL BIG-SERT HEADBOLT
The drill included in the BIG-SERT kit oversize’s the original head alignment dowel
hole in the block. The original OEM dowels would fall thru after Big-Sert Insert is installed.
Universal BIG-SERT head bolt kits includes 2 dowels you need to specify which one you would need.
There are 2 different sizes available to choose from for the M11x1.5 kits
Toyota / Honda style .530 diameter p/n 31304
General Motors style .617 diameter p/n J-42385-508BS.

The head alignment dowel aligns the head to the block at the time of assembly
there are normally 2 head alignment dowels used per side of the block.
Note: Some vehicles may not need dowel e.g “Nissan” as the dowel is NOT located in the head bolt hole, but off to the side.
Subaru dowel p/n 11126 upper diameter size .579 inches or 14.7mm (Kit p/n 11125BS M11x1.25)

Notes: Head alignment dowels for M10 BIG-SERT universal head bolt kits. p/n 7580BS or 6250BS
( 2 sizes of alignment dowel available )
Special dowel p/n 7588BS diameter .530 inches. (used in Bmw)
Special dowel p/n 6255BS diameter .550 inches. (used in toyota and honda)