429 oil pressure

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Sep 7, 2003 | 06:24 PM

hotrodlincoln6996

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429 oil pressure

1969 429cid; pegs oil needle till 2500-3000; above that pressure goes down; let it idle and pressure comes up runs great otherwise; 10 to 1 standard bore,streetmaster,old 4100 autolite off of 428; all in a 77 250 hi-boy

Sep 7, 2003 | 08:50 PM

Mil1ion

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429 oil pressure

Hook a mechanical gauge to it.
Ford's gauges are not the most reliable.

Look for 50-60 at rev then drop to about 20 at idle.

How many miles on the engine ?

Oct 10, 2003 | 11:02 PM

hotrodlincoln6996

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oil press guage is accurate; 20.000 orig miles ( i was told);replaced pistions with forged; all new bearing except cam;cyls had no wear; old bearings looked good

Oct 11, 2003 | 12:06 AM

LxMan1

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From: Louisville,Ky.

High volume pump sucking the pan dry??
It often happens with a stock oil pan.
Jimmy

Oct 13, 2003 | 02:41 PM

gdavis2265

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From: Spokane WA, USA

is there a pressure relief spring in the pump- you might be able to switch to a stiffer spring to bring the pressure up. not sure is the 429/460's have these or not. Anybody?

Jul 16, 2025 | 07:56 AM

8Line

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From: South Houston

reviving an old thread, but didn't want to start a new one.

I'm running Oreily's 10w-30 in my 429. Cold start will give me 80-85psi oil pressure. When hot and at idle it's down to 30psi and increases with RPM as expected.
Anyone concerned about these numbers? Last thing I want to do is overpressure anything.

I do not know if there is a high flow pump installed (how can I tell?)
The engine has a cam in it from the previous owner - I do not know the details.
I live south of Houston (aka its hot a lot) so thinking 5w-30 might be a more comfortable oil?

thanks for any input.