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Old 05-07-17, 11:29 AM   #1
ScottRobinson
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Help with C3!

Hello All, I purchased a 1971 350 in the fall and am thrilled to finally own my dream car. As per expected, however, I have had some issues. Although the car ran fine when it was cold out, as the outside temp increased, the car began to run hotter with temp changes as I drove. I believe that the temp changes are from a faulty thermostat, which I have been meaning to replace. Well, I should have been more diligent. First the the pump gasket blew. Now I have another leak somewhere on the passenger side. At first there was a small amount of coolant at the rear of the valve cover on the intake manifold. Then after a short drive there was coolant spewing all over from that general direction. Enough to make a large puddle on the ground. I hope/assume from the head gasket. There does not appear to be coolant in the oil, but may be oil in the coolant. I have not driven it since then. See, I'm learning.

Current configuration.

Replacement Engine has Mexico made GM Goodwrench 350. PO installed Hooker Headers/Sidepipes, Edelbrock Dual plane intake, Alloy Heads, Carb, MSD ignition. Aftermarket Cam - although not very aggressive. 8.5:1 compression. Current Muncie M-21 and poweer steering both need an overhaul.

So I am all over the map, but here are my options.

1 - Replace the head gasket myself to save $$$. I have read a bunch of how to articles/posts on replacing the head gaskets. From what I can tell the only real challenging part is dealing with re-installing/adjusting the valves. Any feedback on this would be great. My skills are good but my work space is limited. I have a small reserve of cash, but I would rather spend it on Engine upgrades and trans/steering repairs.

2 - Find a good engine repair place. I am not happy with my regular guys. I had them replace the water pump gasket and they left the car outside in the pouring rain. Water all over the inside. Any help with a good engine place near Bala Cynwyd would be awesome.

3 - Complete engine overhaul / crate engine. Considering a 383 complete crate engine. Could do something more custom and use the top end from my current engine on a stroker block and pistons.

Thanks for advice in advance.

Scott
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Old 05-08-17, 01:34 AM   #2
Joel Fellman
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My initial response would be to try & somehow get your Vette to Bryner Chev. in Jenkintown and let Steve take a look. He'll give you an honest opinion and you can then decide to go with the repairs or consider a GM replacement crate engine. I can attest that the ZZ4 is a fantastic engine to consider. Plenty of HP & TQ and a fairly easy swap. Probably a little less expensive than the 383 Fast Burn (and a bit less power) but neither will be cheap.
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Old 05-08-17, 01:45 PM   #3
thoyer
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Quote:
Originally Posted by ScottRobinson View Post
Now I have another leak somewhere on the passenger side. At first there was a small amount of coolant at the rear of the valve cover on the intake manifold. Then after a short drive there was coolant spewing all over from that general direction.
Scott
Some of the intake bolts penetrate into the water jackets in the heads. If the bolts were not installed using a good thread sealant, you may be leaking there.

if you are going to change the thermostat, drain the coolant and pull some of the suspect intake bolts and reseal them.

Before pulling the heads (unless you really want to.....) try performing a cooling system pressurization test as well as a cylinder leak down test. These should tell you if you have issues with the head gasket.

Or, as Joel suggested, get it to Bryner and have Steve look at it.

Tom
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Old 05-08-17, 05:18 PM   #4
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Thanks for the reply. I did a coolant pressure test today and there is definitely a leak coming from underneath the intake manifold gasket at the passenger side rear. There's also oil in the coolant. Looks like little brown spots when I look in the radiator. Can oil get in the coolant from this type of leak?
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Old 05-23-17, 09:37 PM   #5
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Quote:
Originally Posted by ScottRobinson View Post
Thanks for the reply. I did a coolant pressure test today and there is definitely a leak coming from underneath the intake manifold gasket at the passenger side rear. There's also oil in the coolant. Looks like little brown spots when I look in the radiator. Can oil get in the coolant from this type of leak?
Sounds like it may be time to pull the intake and install new gaskets. Prior to installing the new gaskets check the intake to head alignment. If the block was decked or the heads were milled you could have some misalignment issues.

Drain all of the fluids and install fresh oil and coolant also.

Tom
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