Water Pump Bolt Length

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Kilian

Full Access Member
Joined
Mar 25, 2018
Posts
214
Reaction score
37
Location
Wisconsin
First Name
K
Truck Year
1983
Truck Model
C2500 on its way to a K2500
Engine Size
350
When I removed the water pump from my late 1970s 350, there were three different lengths used. Since there isn't a difference in thickness in the water pump casting, and I don't see much difference in the block, what length is correct?

Four 3/8-16 x 2" bolts?

Thanks!
 

bucket

Super Moderator
Staff member
Super Moderator
Joined
Aug 3, 2010
Posts
30,447
Reaction score
28,361
Location
Usually not in Ohio
First Name
Andy
Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
Whichever length is the one that gets you enough thread engagement, plus more to spare. Iirc, the original bolts have around 5/8" of stickout.
 

Latest posts

Forum statistics

Threads
44,190
Posts
951,169
Members
36,311
Latest member
Darksim171
Top