400 SBC Overheating

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Sudsy
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Posts: 1580
Joined: Sat Apr 08, 2006 2:59 pm
Location: Lower Mid North South Australia

Re: 400 SBC Overheating

Post by Sudsy »

FRANK BASILE wrote:Thanks Bob. You mention "drilling the steam holes" . This applies to 400 heads being used on the 350 block? . We got told that one could not use 350 heads on a 400 block. But the other way around was okay. We did end up just replacing the 400 block with a 350 and using the heads that were on the original stuffed 400 block. The other difference from memory was the balancer, something to do with 400 crank and balancer being a matched pair ? . Long time ago now.



Frank the 350 heads would have to be drilled for the steam hole between the centre cylinders to use them on a 400. Not sure why they wouldn't work the other way around. The 400's are externally balanced so you need to use the 400 drive plate and balancer unless you can get the crank internally balanced. Not sure if there are any problems doing this or not
Regards Bob
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1934cv
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Joined: Thu Feb 21, 2008 5:15 pm
Location: Geraldton/WA

Re: 400 SBC Overheating

Post by 1934cv »

Well it has taken a little time for me to sort out the overheating problem as we had a little cyclone called Seroja batter our area we were lucky no structural damage only no power or telephones for 4 days just lost some frozen food and a broken down fridge and and microwave. So I was able to replace the head gaskets and assemble the engine took it to my mechanic to do another CO2 test which showed a very minor amount of this gas getting into cooling system so we then moved to plan F and tried Chem-I-weld and low and behold it worked. No more overheating and I have now been able to register it on a WA street rod license. Thank you to all of you that provided advice. Phil :D :D :D
Whatever hits the fan will not be evenly distributed:)
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