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Old 08-23-2015, 12:20 PM
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Im running two 454 with blowers about 600hp. I recently changed out one of the blocks. Here's the problem I'm using crossover kits and run 120-130 temp. Since I switched blocks its running 100 and below that when I'm going over 2rpms. All I did was change the block out due to a spun bearing. The cooling system stayed exactly the same...so why is the new block running so much cooler? Any ideas?
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Old 08-23-2015, 12:28 PM
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Cleaner passages??? Better water flow?

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Old 08-23-2015, 01:56 PM
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It's just odd to me that since day one with everything new it ran 120-130 and now with just s new block it runs so much cooler
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Old 08-23-2015, 02:37 PM
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Or maybe a sender issue since most gauges/senders don't register under 100 ?

Or, there was a restrictor under the t stat housing that was not reinstalled ?

Last edited by SB; 08-23-2015 at 02:39 PM.
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Old 08-23-2015, 02:58 PM
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No restricters and the stat goes to 100-105 and then when I speed up the needle goes all the way back down as far as it can go. When I idle again it slowly climbs up to 100 again. Sender and stat are also good because I switched motors and tried them
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Old 08-23-2015, 08:58 PM
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Having the same problem tried everything I could think of for the last month. I am using a harden marine crossover with bypass, stainless marine dry.
I have cold water going in the block on one side of the crossover and hot water leaving the block and out the bypass on the othe side of crossover.
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