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Old 01-09-2010, 03:45 PM   #1
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How to identify a 400 sbc

Anything to look for that is different than other sbc's? I'm thinking about tradin my truck for a camaro and he says it has a 400 but I want to be careful that i'm not getting a 305.
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Old 01-09-2010, 05:47 PM   #2
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3 freeze plug bosses in the side of the block and the balancer should have a void in the body where a normal balnacer will have a solid rim.
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Old 01-09-2010, 06:10 PM   #3
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Yup, like he said, that's the two easiest ways, just remember it's 3 freeze plug bosses in each side, sometimes they have 3 plugs, sometimes they have 2 plugs and an empty boss, but all the other SBC's just have two plugs, no 3rd boss in the middle.
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Old 01-09-2010, 07:17 PM   #4
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x2 on the three freeze plugs
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Old 01-09-2010, 07:21 PM   #5
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Look for signs of overheating Just kidding.... ole timers joke
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Old 02-04-2010, 02:49 PM   #6
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Trying to firgure out if my motor is a 400. I can't see the freeze plugs because the emissions legal headers and Theres no way in hell I can see the cast # on the back of the block. The balancer does have a void in it about a inch thick about half way around the balancer. Does only the 400 have this kind of balancer? I'm guessing it is externally balanced since it has this?
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Old 02-04-2010, 05:12 PM   #7
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Could be a 383 with a external bal crank. Get a mechanics mirror and look at the freeze plugs or look up the casting number.
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Old 02-05-2010, 06:48 AM   #8
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I guess i'll try that, when I try to sell the car or part it out I don't want to screw anyone over.
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Old 02-05-2010, 06:54 AM   #9
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I guess i'll try that, when I try to sell the car or part it out I don't want to screw anyone over.
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Old 02-05-2010, 07:45 AM   #10
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Look for signs of overheating Just kidding.... ole timers joke

Ive heard that one before !!
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Old 02-05-2010, 07:46 AM   #11
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Could be a 383 with a external bal crank. Get a mechanics mirror and look at the freeze plugs or look up the casting number.

Very good point. Like lukeduke said a mechanics mirror helps out a lot.
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Old 02-05-2010, 06:17 PM   #12
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Cool

Three bosses for plugs and has bulges on side of block for the big bore.
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