I mean are the delivery valves the same on the 160 pumps as on the 215 pumps?...what changes? spring stiffness...size of opening?

 

Nope...the 160 and 175 pumps have 131 DV's...and the 180 and 215 pumps have the 181's

Even though I've seen them up close side by side, it's really hard to tell where they're different. It's how much material is left that determines the "size"

HTH,
Chris

 

I'm pretty sure the 175's have different DV's than the 160's.

 

175 pumps have the small 131 DVs. I would love to find a set of cheap 181s.

 

I just recently put a set of 181's out of a 215 in mine. I couldnt tell all that much difference driving it, but went from a 16.2 to a 15.7 at the drag strip. I have an injector install kit, and some 215's to go in before scheid.

Eric

 

Dont mean to hijack, but how much did the 215's help your truck? Thanks

Eric

 

They were a nice little gain. It is hard to tell how much as I had them cleaned and popped. They replaced a set of injectors with over 200k on them. I have seen people say they are a 20-40 HP gain. Power, milage, and drivability have all gone up a little.