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Old Feb 19, 2017 | 01:53 PM
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Default oil pump replacement.

I will be replacing my oil pump in a couple of weeks decided to upgrade to melling high volume oil pump. just a question on what else should I change while I am there. thank you in advance for the feedback.
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Old Feb 25, 2017 | 08:08 PM
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No need to upgrade, the Melling M295 will suffice for 90% of Corvette owners.

How many miles are on the car?

Why are you changing the pump?
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Old Feb 26, 2017 | 11:03 AM
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Depending on how many miles you have, I would also replace the timing chain with an LS2 chain and it wouldn hurt to replace thr sprockets, they are pretty cheap.

Wouldnt be a bad time to change the harmonic balencer as they are a known failure point on LS1s.
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Old Feb 26, 2017 | 03:31 PM
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Originally Posted by FASTFATBOY
No need to upgrade, the Melling M295 will suffice for 90% of Corvette owners.

How many miles are on the car?

Why are you changing the pump?
78k basically changing cause I have seen low oil pressure at idle at operating temp. ive heard oil pumps are a down side on ls1s and eventually fail haven't checked the o ring or the filter yet. just want to be safe than sorry
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Old Feb 26, 2017 | 03:35 PM
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Originally Posted by Oskardohc
78k basically changing cause I have seen low oil pressure at idle at operating temp. ive heard oil pumps are a down side on ls1s and eventually fail haven't checked the o ring or the filter yet. just want to be safe than sorry
I've never seen an LS1 oil pump "fail". It's a Gerotor style pump, not much to fail inside.

I would replace the oil pressure sender before I ever embarked on the pump replacement.

What pressure at what temp? What oil weight?
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Old Feb 26, 2017 | 03:56 PM
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Considering all that's needed to be removed to get to the oil pump, I'll go ahead and be that guy that says to swap the cam.
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Old Feb 26, 2017 | 07:17 PM
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I have replaced many LS style oil pumps. The pressure relief valve sticks and will cause low or no oil pressure. Not uncommon.




Originally Posted by FASTFATBOY
I've never seen an LS1 oil pump "fail". It's a Gerotor style pump, not much to fail inside.

I would replace the oil pressure sender before I ever embarked on the pump replacement.

What pressure at what temp? What oil weight?
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Old Feb 26, 2017 | 07:47 PM
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Originally Posted by FASTFATBOY
I've never seen an LS1 oil pump "fail". It's a Gerotor style pump, not much to fail inside.

I would replace the oil pressure sender before I ever embarked on the pump replacement.

What pressure at what temp? What oil weight?
I have read of many ls1/ls6 oil pump failures, probably the number one cause for low oil pressure including my own failure.

I replaced mine with a melling been running well since. I would replace everything you can afford to do while tearing down if you're running original parts, ie cam, timing chain, water pump, thermostat, starter etc.
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Old Feb 26, 2017 | 07:58 PM
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Those are the first I've heard of pumps failing, oil pressure senders are regular...pumps are not(to me anyway).
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Old Feb 26, 2017 | 09:01 PM
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Originally Posted by MSUGTO
Considering all that's needed to be removed to get to the oil pump, I'll go ahead and be that guy that says to swap the cam.
I second that but it will open up a whole new can of worms so if the op is on a strict budget it may not be the best idea
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Old Feb 26, 2017 | 09:27 PM
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Originally Posted by neutron82
I second that but it will open up a whole new can of worms so if the op is on a strict budget it may not be the best idea
I might slide a $100 LS6 cam in thurrrr.
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Old Feb 26, 2017 | 09:32 PM
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if oem do an ls9, you can get one new for around $150... you will need a gen4 timing setup, cover, wiring as well to do that so factor that in as well... thinking about it, it probably isn't worth it after all that and an aftermarket cam made for an ls1/6 would end up being cheaper

Last edited by StingrayRebel; Feb 26, 2017 at 09:37 PM.
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Old Feb 26, 2017 | 09:36 PM
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Originally Posted by neutron82
if oem do an ls9, you can get one new for around $150
LS9 is for a boosted application right?
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Old Feb 26, 2017 | 09:39 PM
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yeah it is popular for boost but would still work n/a... people do the same with the ls6 cam but the ls9 would probably net a little more power over the ls6... but like I edited in my post above it probably isn't worth it, I was typing before my brain was really thinking

Last edited by StingrayRebel; Feb 26, 2017 at 09:41 PM.
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Old Feb 28, 2017 | 06:02 PM
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I believe I'd try changing out the oil pressure sending unit first.
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