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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: westsidek20 on June 21, 2011, 02:31:57 pm

Title: high flow oil pump and high pressure fuel pump.
Post by: westsidek20 on June 21, 2011, 02:31:57 pm

At what point do they become necessary while doing a build?

Title: Re: high flow oil pump and high pressure fuel pump.
Post by: Grim 82 on June 21, 2011, 03:22:11 pm

Ideally, on a fresh build and a carbureted engine you would need neither. Carbs are meant to run with low fuel pressure, 4-6 psi or else the flow will push the needle off the seat. Fuel injection is a different story.
If you have larger bearing tolerances a high volume oil pump can help to maintain your oil pressure.

Title: Re: high flow oil pump and high pressure fuel pump.
Post by: westsidek20 on June 21, 2011, 04:24:06 pm

So by running my quadrajet in the 383 project i wouldnt need the fuel pump, right?
And bearing clearance isnt an issue?

Title: Re: high flow oil pump and high pressure fuel pump.
Post by: Grim 82 on June 21, 2011, 04:50:59 pm

The stock mechanical pump will work fine with your q-jet.
Bearing clearance shouldn't be an issue on a new build, but use plastigage to check it.

Title: Re: high flow oil pump and high pressure fuel pump.
Post by: 1979C20 on June 21, 2011, 05:28:44 pm

I have stock clearances and im using a high volume oil pump just because.