Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - early model vs. late model 350 blocks
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Old 08-13-2007, 04:53 PM
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Basic same motor. Crank is different, flywheel, Pan, most heads are different, Blocks tend to be thin castings with very few four bolt main motors produced.

Internally, some are drilled and fitted for hydraulic roller lifters, whether they have them or not. Some just have the extra bosses. Some have no provision for mech fuel pump.

Still good for street and mild race motors, just different from the old school blocks..
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