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Old 04-19-2003, 01:35 PM
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Post 400 small block re"performance"build

Hey guys.A friend of mine just asked me to build this 400 he's got for his car.So I'm gonna(evan though I haven't touched my own car in months lol).
Anyway its a 511 block with a two bolt main.Mortec said the block # was a 70-73 4 bolt and that 2 bolts were a replacement block.It also has three freezeplugs on each side(huh-$#@!%^$^**^???)
Anyway apperantly this block came from a stockcar racer,it was left out in the weather to die and is siezed right now.I pulled the heads of it and there 1.94 882s with guide plates and screw in studs.Upon opening it I could see it had been decked cause the stamping pad #s were gone and the surface was perfect(no little pits and stuff like an undecked block)Heads were decked to.
Well anyway it was allready bored .030 and to get it unsiezed I'll have to break the pistons into potato chips and I don't think theres enough left to go to .040 so its .060 were a goin.
So 400 guys is this a good block???
And also hows .060 sound for a low compression torquey street motor.Is 060 really pushing it for a 400.Should I have the cylinders sonic checked or something??I don't think sleeving the whole block is in the budget.
This whole symeize bore steam hole thing is new to me.And was the three freeze plug thing just a scheme for OT at the GM plant lol???

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Old 04-19-2003, 01:47 PM
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Have the cylinders sonic checked, it's best to put some hydraulic patch filler in the water jacket, fill up to the freeze plug's. This will help strengthen up the block and stop any water leaks. It won't do anything to make it heat up.
I advise getting a GM performance book from a dealer for $8.00 it tells you how to blueprint a 400 block. Email me if you need any other info.
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Old 04-19-2003, 07:32 PM
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.040 is no sweat. It will be fine. If is is a race engine, or will see lots of power do a tall fill with hard block to keep the cylinders from walking around. If you do the hard block, you will need a large oil cooler. Engine oil looses it heat through the block and with it full, it will not cool properly for the street.

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