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i bought a motor today with 186 cast heads
the block 3970010 casting number. The odd thing is the casting number is very small how can i tell if this is a 302? Mortec.com leaves me hanging email if you can help
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The 302 crank will have an 1178 casting #. On an original block there will be a stamp on the front passenger side that will end with DZ. e.g. V0130DZ. Will have a 4 bolt main with a windage tray, dome pistons.
 

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This block (3970010) seems to be the one of choice for replacement engines. I've seen it used as part of the display engines at several of the chain auto parts stores such as Pep Boys.
Mark
 
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