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Re: Advice needed after compression test
jtozier406 #760495 May 08th 2020 5:17 pm
Joined: Sep 2005
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These engines were prone to cam lobe wear. When you pull the valve covers you can measure and compare the rocker arm movement for a idea of how much lobe wear you have. I've seen guys crank down on the rocker arm adjustment on a cylinder with a bad lobe just to get it quiet enough to sell the vehicle. If the cam is worn, or if the rings and valves leak you'll have a better idea of the condition and past life of the engine and can make an informed decision on the next step. JustMy2%.
Replacement would depend on how long I was gonna keep it and the condition of the rest of the van. That would be a personal choice. We have a '94 GMC with well over 300K and it's part of the family. In fact I believe, sometimes, the wife likes it better than she does me. If it needs anything it gets it. Same with our '95 G20 but it just turned 65K.

Re: Advice needed after compression test
CatFish #760497 May 08th 2020 6:21 pm
Joined: May 2020
Posts: 75
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Originally Posted by frscke1
The 350 is a good motor … if you get a new crate its the same block you have now with new gaskets...… I don't believe the motor is bad it just needs some lovin …

maintenance is always better than a catstroific failure ...


If you were going to open this up and replace gaskets/seals/clean what would you be looking to do? I am new to this and looking to learn.

Originally Posted by CatFish
These engines were prone to cam lobe wear. When you pull the valve covers you can measure and compare the rocker arm movement for a idea of how much lobe wear you have. I've seen guys crank down on the rocker arm adjustment on a cylinder with a bad lobe just to get it quiet enough to sell the vehicle. If the cam is worn, or if the rings and valves leak you'll have a better idea of the condition and past life of the engine and can make an informed decision on the next step. JustMy2%.
Replacement would depend on how long I was gonna keep it and the condition of the rest of the van. That would be a personal choice. We have a '94 GMC with well over 300K and it's part of the family. In fact I believe, sometimes, the wife likes it better than she does me. If it needs anything it gets it. Same with our '95 G20 but it just turned 65K.


Haha the vans have a soul of their own.


1977 Chevy G20 Ramjet 350 4L80E 4x4
Re: Advice needed after compression test
jtozier406 #760498 May 08th 2020 6:29 pm
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Originally Posted by jtozier406
If you were going to open this up and replace gaskets/seals/clean what would you be looking to do? I am new to this and looking to learn.


What would I be lookin for ? The number to my mechanic as I am not. You know Or will know whats wrong and whats been fixed with this one … getting a new one you start over. New isn't always better. I had bad parts right out of a new box.

Ive had both of my 454's refreshed .


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Advice needed after compression test
jtozier406 #760499 May 08th 2020 7:14 pm
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Refresh it with a 454 jtozier406..lol


When in doubt..get the sawzall out..
Re: Advice needed after compression test
jtozier406 #760513 May 09th 2020 8:40 am
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The engine I pulled out of the Queen Anne's Revenge had a blown head gasket and cylinder #7 was filling with coolant.

Replacing the gaskets isn't really a huge task, but it is time consuming. There are a ton of great videos on YouTube about SBC repair. I've always left out the front and rear parts of the intake gaskets and used RTV instead. The front and rear pieces they give you in the gasket kit always seem to leak on me.

I also prefer the thick aluminum exhaust manifold gaskets where the manifolds bolt to the heads, but the paper style gaskets aren't too bad either.

We decided to pull the 350 with blown head gasket and throw in a temporary 305 just to get us on the road until we get the time and money to rebuild the 350.


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