Need c3 guru advice
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
Likes: 235
From: South florida
Need c3 guru advice
Have 69 all original 300hp automatic with factory air very original Ncrs type car
2 questions
1. What is best oil pan gasket to use to prevent leaks. Paid a shop to replace rear seal and oil pan gasket and they did a horrible job . I will look to redo it myself this weekend. Should I use a one piece gasket ?
2. The car is in south florida and in the heat of the afternoon it runs too hot with ac on ( just when you need it ) especially when extended idling occurs . I don’t want to radically change it , don’t want to put modern ac compressor or modern radiator if I can help it. Was wondering if anyone knows if the gm shroud extender would substantially help and if I should switch to a seven blade flex fan maybe ? And if so any recommendations for something sort of original looking and a direct fit ?
Greatly appreciate all advice.
2 questions
1. What is best oil pan gasket to use to prevent leaks. Paid a shop to replace rear seal and oil pan gasket and they did a horrible job . I will look to redo it myself this weekend. Should I use a one piece gasket ?
2. The car is in south florida and in the heat of the afternoon it runs too hot with ac on ( just when you need it ) especially when extended idling occurs . I don’t want to radically change it , don’t want to put modern ac compressor or modern radiator if I can help it. Was wondering if anyone knows if the gm shroud extender would substantially help and if I should switch to a seven blade flex fan maybe ? And if so any recommendations for something sort of original looking and a direct fit ?
Greatly appreciate all advice.
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
Likes: 235
From: South florida
Team Owner
Joined: May 2001
Posts: 87,367
Likes: 1,593
From: Western NY
FelPro makes a very nice, one piece, with steel grommets in place (to prevent over tightening), oil pan gasket. I do know that GM used two different thicknesses of "end seals" for the oil pan, based on model years. I don't know however, what the "break point" was, with respect to the model years. I also am unsure if FelPro offers this particular pan gasket with both of the end seal thicknesses, or just the later years. I used this particular gasket on a 90s SBC, with good results.
Burning Brakes
Joined: Oct 2001
Posts: 925
Likes: 200
From: TX
Hardhat
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS
Intermediate
Joined: Jul 2019
Posts: 42
Likes: 11
Have 69 all original 300hp automatic with factory air very original Ncrs type car
2 questions
1. What is best oil pan gasket to use to prevent leaks. Paid a shop to replace rear seal and oil pan gasket and they did a horrible job . I will look to redo it myself this weekend. Should I use a one piece gasket ?
2. The car is in south florida and in the heat of the afternoon it runs too hot with ac on ( just when you need it ) especially when extended idling occurs . I don’t want to radically change it , don’t want to put modern ac compressor or modern radiator if I can help it. Was wondering if anyone knows if the gm shroud extender would substantially help and if I should switch to a seven blade flex fan maybe ? And if so any recommendations for something sort of original looking and a direct fit ?
Greatly appreciate all advice.
2 questions
1. What is best oil pan gasket to use to prevent leaks. Paid a shop to replace rear seal and oil pan gasket and they did a horrible job . I will look to redo it myself this weekend. Should I use a one piece gasket ?
2. The car is in south florida and in the heat of the afternoon it runs too hot with ac on ( just when you need it ) especially when extended idling occurs . I don’t want to radically change it , don’t want to put modern ac compressor or modern radiator if I can help it. Was wondering if anyone knows if the gm shroud extender would substantially help and if I should switch to a seven blade flex fan maybe ? And if so any recommendations for something sort of original looking and a direct fit ?
Greatly appreciate all advice.
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
Likes: 235
From: South florida
Hardhat
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS
are you also also located south florida ? This car runs cool all the time as well except in peak heat of afternoon when sitting at idle for a while like at a long light , is not a problem in winter here which is maybe eighties during the day. Just summer.
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Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,067
From: Virginia USA
When you have your pan off take a straight edge and make sure your sealing surfaces are flat. If not gently tap them flat with a small hammer. Check again, rinse and repeat until nice and flat. I'll bet you'll find its dimpled at every bolt hole.
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
And keep in mind. You bend metal then bend it back, it is softer and easier to bend back the other way. Take care not to overtighten oil pan bolts. Temps. Check seals around radiator. Maybe a little home depot stick on foam in any obvious gaps. But verify your temps. It might be 190-200 and telling you 230. Gauge and sending unit ain't young. And if one is they may not be fully compatable.
Last edited by derekderek; Jul 26, 2019 at 08:25 PM.
Burning Brakes
Joined: Jul 2018
Posts: 979
Likes: 258
From: Maryland
Hardhat
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS
I have the same engine, original fan and factory ac and runs cool all the time. I bet your radiator just needs to have 50 years of sludge boiled out of it by a radiator shop! Also, upon getting the timing right, as per Lars instruction, I found the car to run cooler (and quicker, initial advance at 12 degrees.)
VS