I have always fought my Chevelle with cooling issues and never really had a chance to completely sort it out properly. I am looking to really drive my car further distances than I have in the past. I have always just drove my car on cooler days or not very far when it is hot out. It tends to stay around 195 when cruising but as soon as I start slowing or get stopped for any period of time it starts to heat up. Not quickly but faster than I think is acceptable. If I leave it alone and let it idle it will go to 220 no problem. It will get hot if I am running it pretty hard or do a real good burn out.
Some of the cool things that go in here in Indy aren't exactly close to my house. And I really want to drive my car to some of the events this summer but don't want to stress out about it overheating or have to stop every 10 miles. My car is a 67 chevelle with a 454 HO crate motor.
8.75:1 compression
.510 intake .540 exhaust lift
211 intake, 230 exhaust duration
112 ATDC and BTDC
1.7 rockers
750 vac secondaries Holley
Hooker comp headers with 2.5 inch exhaust with flows with turndowns at the rear axle with an h pipe
I am running a weiand team g water pump (mechanical)
Griffin aluminum radiator with (2) 11" Spal fans (no shroud) that are set to run continuously
MSD ignition
The transmission is a TH400 with a 3500 stall.
rear gears are 4.10 in a 12 bolt
rear tires are 245 60 15
I need to check the timing and see where it is at. That is one of the things I think may be causing my problems.
I think this will be an ongoing thread as I will be addressing seperate issues as I try to hone in on my cooling issues.
My first question is I have always run 20W50 in all of my older vehicles. Per GM my motor is spec'd to run 5W30 Synthetic. By switching to the 5W30 would that help the motor run cooler? Or is the gain going to be minimal and I need to start by looking at other things first?
Some of the cool things that go in here in Indy aren't exactly close to my house. And I really want to drive my car to some of the events this summer but don't want to stress out about it overheating or have to stop every 10 miles. My car is a 67 chevelle with a 454 HO crate motor.
8.75:1 compression
.510 intake .540 exhaust lift
211 intake, 230 exhaust duration
112 ATDC and BTDC
1.7 rockers
750 vac secondaries Holley
Hooker comp headers with 2.5 inch exhaust with flows with turndowns at the rear axle with an h pipe
I am running a weiand team g water pump (mechanical)
Griffin aluminum radiator with (2) 11" Spal fans (no shroud) that are set to run continuously
MSD ignition
The transmission is a TH400 with a 3500 stall.
rear gears are 4.10 in a 12 bolt
rear tires are 245 60 15
I need to check the timing and see where it is at. That is one of the things I think may be causing my problems.
I think this will be an ongoing thread as I will be addressing seperate issues as I try to hone in on my cooling issues.
My first question is I have always run 20W50 in all of my older vehicles. Per GM my motor is spec'd to run 5W30 Synthetic. By switching to the 5W30 would that help the motor run cooler? Or is the gain going to be minimal and I need to start by looking at other things first?
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