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Old 11-05-2010, 08:00 AM   #12
bigsnookmaster
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Location: St.Petersburg,Fl
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Re: How to tell the diffence in engine size????

400's have three freeze plugs in the side of the block. Some only have two, but there is a boss in the middle where the third one would have been. Casting numbers ending in 511, 509, and 817 are also indicators, besides the balancer with a notch, and flexplate with an external weight.
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