Identifying Chevy engines
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While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount: | While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount: | ||
[[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/> | [[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/> | ||
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| + | ==Tall deck BBC== | ||
| + | The 10.2" deck height tall deck BBC was made in two different sizes: 366 and 427 cid. These engines were made to stand up to heavy duty use like bus and dump truck, etc. right up to where a diesel would be used. The tall deck height was to facilitate the 4 ring piston ring pack used with these engines. The bottom ends were forged and the rods were heavy duty-and heavy in weight. | ||
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| + | These engines can be made into good performing engines without going to too much trouble or expense. A [http://www.hotrodders.com/forum/cheapo-bbc-505-tall-deck-grunt-motor-164014.html#post1160950 here] is a thread showing a budget build up of a 427 tall deck BBC. | ||
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| + | If the engine is assembled, the stock intake had two thermostats on it and the intake is also wider due to the taller decks. The distributor is different and may have a different oil pump drive arrangement. | ||
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| + | One of the easiest ways to tell a tall deck BBC block from a standard 9.8" deck height BBC block is to check the distance from the top water pump bolt hole to the block deck. A standard block (below left) will have very little space between the hole and deck; a tall deck block will have around 1/2" between the hole and deck (below right). | ||
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| + | [[File:454 deck.JPG]][[File:Bbc tall deck.jpg]] | ||
==BBC 502== | ==BBC 502== | ||
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