I am interested to hear from people who have used piston oil squirters on a big block Mopar and how well it worked for them. Did you use check-valve type squirters or just simple jet? What size orifice? Did it help with piston cooling?

I have a Keith Black 541 and my builder has installed 0.031 squirters (non-check-valve). We have run it in on the dyno and there were no problems with oil pressure. We're hoping the oil jets will help with piston temps, this is a turbo application.

any pictures?

I have not used them on a 440 but will share an industrial engine "best practice". The oil jets use a lot of oil. In hot idle situations, partially covered pickup situations ect. oil pressure can drop a lot with the jets. A HV pump would be mandatory I think and a pressure sensitive check valve or check valve on separate circuit a big plus. When pressure drops, the main and rod bearings need as much help as they can get.

.031" sounds like a lot. Have you experienced problems with piston temperatures, or why are you doing it?

a .031" x 8 equals one hole thats .087",a fair size hole.

More like full flow from a 1/4" line just for the squirters. Now also look at how much oil is going to the turbos and it really starts to add up. It probably isn't an issue at rpm, but at idle it could be a significant portion of the total oil volume.