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Old 06-26-2002, 07:58 PM
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Post chevy 350 overheating

I just brought my 350 to life a few days ago. It runs good and has tons of torque. I have 305 heads on it with flat top pistons. I have heard of overheating trouble with the 305 heads on the 350. I just bought a brand new 3 core radiator for it. I have a new water pump and i put an electric fan on it. Would a clutch fan work better? Well i have a 160 thermosdat and if it is idling it stays cool fine but when I drive it it heats up. with the new radiator I haven't gotten it past 210 degee's but I havent driven more than a couple miles at one time because I'm afraid it will keep going up. What is the danger zone for the temp? It is a brand new engine exept for the heads and block. I had it to 230 with the other radiator and i shut it off and it went to about 240 when i shut it off. nothing cracked that time. Any info would help. Thanx
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Old 06-26-2002, 08:39 PM
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geez, man, sounds like youre doing everything right. Only two suggestions i have would be to go all the way up to a 4 row radiator and make sure you have some steam holes in the heads/block. Is it a stroker? if it's not, i wouldn't think it should be doing that. maybe you should ask the people who built your motor. if you built it yourself, just keep searching for tech help. One last thing--if your temp. guage is digital, they're not ALWAYS the most accurate.
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Old 06-26-2002, 10:03 PM
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If you put 305 heads on a 350 w/ flat tops your probably pushing 11:1 territory.Is it detonating under exceleration? My guess would be to high comp and to cheap a fuel.Try premium(93+) w/ octane booster.Maybe even back off timing a few degrees.
78 monte
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Old 06-27-2002, 07:23 AM
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COMP RATIO PEEPS!

Other than that, its a chebbie... theres ur prob..
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Old 06-27-2002, 08:27 AM
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No it's not a stroker, and it doesn't seem to be having detonation problems. I think i should probably fool with the timing. And upping the octane would be a good idea too. I only used 89 I guess I wasn't thinking about the high comp. The only thing that is a liitle confusing to me is that it stay cool while sitting or idling. It may be that it's brand new or the high comp right? well thanks for the help anymore Ideas would be helpfull.
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Old 06-27-2002, 09:38 AM
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If it idles fine, but heats under power, youve got detonation... Timing, Higher octane gas, Good octane booster... jet the carb a bit richer... might help..
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Old 06-27-2002, 01:41 PM
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also what would be the temp danger zone for a new chevy 350??
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Old 07-03-2002, 06:51 PM
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chevyelk, ran into exact the same problem with my "55 Chevy p/u, 350sb.My advise is to go back to a clutch fan. I installed a beautiful Griffin radiator, to make it look cool with 2 electric fans. Overheating! went back to my clutch fan and the thing stays cool wherever I go. And it's real hot here in Dominican Republic.
Good luck and let me know.
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Old 07-04-2002, 11:29 AM
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My advice...clutch fan, RMI-25 and a coolant filter to keep the internal heat transfer surfaces clean, full manifold vacuum for better cooling at idle, water wetter, and, make sure you are not basing your cooling decisions on temperature indicated at the head, should be measuring it at the intake manifold...I have seen this alot lately. Use the head location for the idiot light only. Your analog or digital temp guage should be sensing at the intake manifold....Scott
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