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 Post subject: Coolant flow modifications for Big Block Chevys
PostPosted: Thu Oct 01, 2009 5:09 pm 
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Mike - I'm curious if you've every experimented with different modifications to Big Block Chevy heads to reduce hot spots vs using the regular thermostat housing/water pump setup.

Do you recommend lines from the rear part of the heads to the thermostat area? I know Small Blocks have issues between the center exhaust ports with getting hot, and Big Blocks aren't likely to have that issue.

What about reverse flow - putting the water in the head first, say at all 4 corners?


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 Post subject: Re: Coolant flow modifications for Big Block Chevys
PostPosted: Thu Oct 01, 2009 6:42 pm 
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Joined: Mon Sep 28, 2009 7:47 pm
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Big blocks have such large water jackets that it's rarely an issue. Reverse cooling could help. You would be able to get away with a bit more timing and make a little more power.


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 Post subject: Re: Coolant flow modifications for Big Block Chevys
PostPosted: Fri Oct 02, 2009 8:00 am 
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Got any ideas on how to make sure there isn't air trapped in a reverse cooled big block?


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 Post subject: Re: Coolant flow modifications for Big Block Chevys
PostPosted: Sat Oct 03, 2009 7:07 pm 
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There is a super nifty tool that pulls a vacuum on the cooling system and will siphon the coolant right back in. No air, no mess, it's awesome.


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 Post subject: Re: Coolant flow modifications for Big Block Chevys
PostPosted: Tue Oct 20, 2009 1:18 am 
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Joined: Sun Oct 04, 2009 12:54 am
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Location: Maryland
Mike Stark-CFM wrote:
There is a super nifty tool that pulls a vacuum on the cooling system and will siphon the coolant right back in. No air, no mess, it's awesome.


Correct it is called an "Air Lift" and you can get one from Snap-On for about $150 if memory serves correct but I bought mine so long ago they may be much more now

One thing you can do on a budget is remove the radiator hose, and fill up the system while holding the hose up and that will purge any air and when water starts coming out of neck and/or hose slip it back on and clamp it (this is how we did it before the "Air Lift" Mike is talking about)


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