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post #1 of 3 (permalink) Old 04-09-2019, 01:26 PM Thread Starter
 
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Hi
I rebuilt my 1970 GTO RamAir 3 engine using Melling M54f. After 500miles i heard noise coming from the engine while driving 75miles. We pulled the engine out and found out after taking it apart that the oil pump check valve is out. I don't know why this thing happened??? Should i change the pump. Which oil pump should i buy???

Last edited by Aziz2010; 04-09-2019 at 02:43 PM.
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post #2 of 3 (permalink) Old 04-09-2019, 03:13 PM
 
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Most just use the M54DS. Some add an extra bottom plate, or go with a thicker plate.

In my 455 bracket engines, I used the M54DS & shimmed the spring for little more pressure.

Or, if you wanna spend $150 +, you can buy one that's been modified by Butler.

https://butlerperformance.com/i-2445...tegory:1234738
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post #3 of 3 (permalink) Old 04-09-2019, 07:36 PM
 
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Originally Posted by Aziz2010 View Post
Hi
I rebuilt my 1970 GTO RamAir 3 engine using Melling M54f. After 500miles i heard noise coming from the engine while driving 75miles. We pulled the engine out and found out after taking it apart that the oil pump check valve is out. I don't know why this thing happened??? Should i change the pump. Which oil pump should i buy???
Well, I guess we know what the "f" means. Agree with bigD. I checked the Mellings website and the M54f description says, " Standard volume and pressure, Ram Air engine, 30% more pressure than M-54D-S." Whaaaaat? Now Butler lists the pump as "Melling Pontiac RA/SD High Vol. 80 psi Oil Pump-w/o Pick-up MEL-M-54F."

If it is the 80PSI pump, personally, too much pressure unless you have a lot of bearing clearance and plan on racing the engine and spinning high RPM's.

I found this description on another site as well as Butler for the Mellings 10540 pump for the Pontiac, "High pressure performance upgrade for the M-54D-S. The housing is CNC machined and phosphate coated. Includes 3/4 diameter oil pickup screen." The description says it is a standard volume/high pressure pump, BUT, at the top of the page showing this pump at Butler, the header says, "Melling Performance Pontiac High Vol./ 60 psi Oil Pump-with Pick-up MEL-10540. A little bit confusing to say the least.

You don't really need more pressure than the 60 PSI for a stock engine, but more volume and the 3/4" pickup is more desirable.

I went with this Butler pump that bigD pointed out. Yep, more money, but at what cost is another engine?? It is 60PSI, flows more volume, and I cannot recall if it uses the 3/4" pickup/screen (although the descriptions does not state this, but Butler builds their Pro pump off the M54DS which they state has the 3/4" pickup). Oiling is essential on a Pontiac and can be the weak spot, so why chance it? https://butlerperformance.com/i-2445...tegory:1234738

And if you did not get a hardened oil pump shaft to replace the stock one, get one.

I saw that the Mellings M54f had a 12 month warranty, so you might be able to get your money back.
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