SRV8

Hi,
I want to install oil restrictors from OPP (screw in type).
The Engine will be for heavy street use, should I restrict like from OPP descriped 1,2,3,4 mains or only like most other (Mondello) said 2,3,4 thank you for help.

Jörg

Run to Rund

JMO, today's cam bearings usually have a small enough hole that no restrictor is called for. Up to .150" is good in the bearing.

L69

I have never run restrictors and have never had a problem. I have had some pretty stout strip motors with stock oiling. As long as shifting is kept below 5500-5800 max you should be fine. At most possibly shim the spring in the stock pump to slightly increase oil pressure.

joe_padavano

Why? Check the oil flow diagram in the Chassis Service Manual. These do NOT restrict oil to the rockers. Also, Search is your friend:

https://classicoldsmobile.com/forums...eet-motor.html

https://classicoldsmobile.com/forums...strictors.html

https://classicoldsmobile.com/forums...ary-where.html

Octania

I shimmed the OP spring on the 403 recently made viable again. Very happy with the pressure. It's about 60 cold, and 45 warm. Steady as a rock.

SRV8

Hi Octania,
how much you shimmed it ?

SBORule

All they are is pipe plugs with a hole drilled in them.
Probably selling to ya as a kit, comes with a tap so you can screw in the pipe plugs that cost him a couple dollars and a tap from china that cost another 2 bucks.

How much does he want for his main oil restrictor kit ?