400 big block oil pump long bolt size?

[flamesoldier]

Does anyone know what size and length the longer mounting bolt of the oil pump is for big block, road runner i bought is missing that longer bolt dont want to buy a whole set and spend 20 bucks for a 2 dollar grade 8 bolt at ace.

 

[AndyOpi66]

Just so this information is out there for others who need it. The original shank length (not including the flange height) is 4 3/16. The flange is about 1/4 in thick. It is a 3/8 bolt. Closest thing at the hardware store would be 4in in length a bit short, or 4.5in which may have to be cut down.

The shorter bolts are about 2 5/8 in shank length (not including the flange height). The flange is the same at about a 1/4 in thick. It is also a 3/8 bolt. Closest thing at the hardware store would be 2.5in in length a bit short, or 3in which may have to be cut down.

 

[RJRENTON]

Does anyone know what size and length the longer mounting bolt of the oil pump is for big block, road runner i bought is missing that longer bolt dont want to buy a whole set and spend 20 bucks for a 2 dollar grade 8 bolt at ace.

Have you tried ARP ? They have a catalog.....call them for details
BOB RENTON

Order Desk & Technical Support: 800.826.3045

Hours: Monday - Friday, 7:30am - 4:00 pm PST
Outside the U.S. and Canada: +1 805.339.2200
Fax: 805.650.0742

Location & Hours

1863 Eastman Avenue, Ventura, CA 93003
Will Call Hours: Monday - Friday, 8:00am - 4:00pm PST

Sales & Marketing: 805.339.2200