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can somebody PLEEASE help me understand allllll the differences of a 74 302 vs. a 80something efi'd 5.0??
thanks
 

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'74
28oz. balance
standard rotation water pump
two piece rear main seal

'80s efi
50oz. balance
reverse rotation water pump9serpentine setup)
one piece rear main seal

More to this list that someone will add to
 

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The 80s something block has no threaded hole for clutch linkage and no dipstick tube hole for front sump oil pan(there are fixes for both of these problems though).These are only problems if your puttng it into an older ford.


<font size=-1>[ This Message was edited by: frdnut on 5/16/02 2:47am ]</font>
 

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Some of the mid seventies blocks had a deck height addition to lower compression. They are also very weak, and not recomended for performance applications.
 

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water passages changed 4 times (head to the block). soo whatch changeing heads around. one head gasket fits all so be carefull!!!!
 

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So is the 5.0 a better block than the 302 and can you put a manifold designed for a 302/289 on a 5.0 block?? what block is better the 289,302, or 5.0?
thanks,
 

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Both have advantages.

The early blocks are heavier, which means they can be stronger in certain area`s depending on which block it is and how old, which is why a lot of guys use the older blocks for strokers and high HP applications.

The 5.0 blocks are lighter. Ford wanted to save a few pounds so they took some material out of the engine blocks, not sure where they lightened them up, but I think are 25lbs or so lighter. "Thin wall" casting comes to mind, again not sure of specifics.
 

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So can you put an Intake manifold and heads made for a 302 on a 5.0? Whats the major difference between these blocks besides weight and deck height?
 

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Yes a 5.0 is a 302 same basic block except for the main seal and harmonic balancer 28 early 50 after 80-81
 
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