Identifying a 400 small block chevy
10-01-2009, 01:21 PM
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Identifying a 400 small block chevy
How can I identify a chevy 400 small block in the truck. Heres a pic of my blazer that is suppose to have a 400 in it, but I am being told with the passenger side dipstick its a 350?
10-01-2009, 05:04 PM
#4
Could be a 383, but i've never seen a 400 with a pass side dipstick, 400's are all left. That is a later modle block you have there 79 up 305~350. Easiest way to spot a 400 is the balancer will have a cut out, not smooth like the internal balamced 283~350's, also the block will have ribs down by the freeze plugs where the 350 is smooth. 400's don't have the 1/8'' pipe plug above the timing cover like the 350's it's just a undrilled boss. The last 3 casting numbers on the back of the block are 511, 509, 817.
Last edited by stock48; 10-01-2009 at 05:12 PM.
10-01-2009, 05:13 PM
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I still think there is a cast mark for it only it wasn't done.. Check by number 1 cylinder for a buldge in the block, (iirc) they call it a steam pocket.. whast the cast numbers on it>>>????
10-01-2009, 05:14 PM
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I still think there is a cast mark for it only it wasn't done.. Check by number 1 cylinder for a buldge in the block, (iirc) they call it a steam pocket.. whast the cast numbers on it>>>????
Stock48, wasn't some 400 internally balanced?? I remember reading that some where..
Stock48, wasn't some 400 internally balanced?? I remember reading that some where..
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10-01-2009, 06:37 PM
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cant find the casting numbers on the back of the block. I know it originally had a 400 going by the vin# but that doesn't mean it hasn't been swapped.
10-01-2009, 06:39 PM
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the casting number is on the drivers side behind the head.. your prolly gonna have to scrap some dirt and sludge off to find it..im pretty sure its a 350.. i never knew of any 400 that had the dipstick on the passenger side