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· Registered
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719 Posts
the pump is on a blown injected alcohol 392 hemi and it blew one freeze plug
maby to much scoop on your water pick up? that will create a ton of block pressure!
we had the water pick up behind the rudder in a hydro, it was cut on a 45° angle. I put a pressure gage with a check valve on it, only to find out we had 130 lb's of block pressure! we filed it alittle at a time till we got down around 50 lbs after a 170 mph pass...
hope Info helps.:)
 

· Precision Craft Marine
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1,529 Posts
Hydroman, try removing the waterpump . You are running alcohol. Hydros like yours are not lake boats that need water pumps. You are poluting your motor oil because you have zero heat in the motor. You can force feed that engine with water. Old hemi's need timing, and with alot of timing, you dont build very much heat. If the motor has a real flowed injector, and if you are at 11-12 to 1 on compression, those motors run up to 46 degrees btdc safely, on alcohol. The reason for all of this info is, it all comes into play. You need to drop that thing off here, and I will gear, prop, time and tune that beast to do what it is supposed to do. You have alot of potential with that boat.
 
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