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Unread 11-26-2013, 05:33 PM   #1
COBRA5LADDICT
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is a 73 258 6 cyl the same as an 82?

other than being 1 bbl and not 2 bbl.

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Unread 11-26-2013, 05:53 PM   #2
WindKnot
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Substantially, yes. Exactly? No.
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Unread 11-26-2013, 06:03 PM   #3
hp_lovecraft
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There was a major redesign in 1980, mainly to reduce weight. Lighter block, heads, manifolds, etc.

The engines look identical, but lots of little things don't fit. Typically, people don't even realize that they have a swapped engine until they buy some parts (ie valve cover gasket, water pump, etc), and they don't fit like the should.
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Unread 11-26-2013, 06:13 PM   #4
atopi3
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the head on the 73 has a week spot that cracks but by 80 that has been fixed
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Unread 11-26-2013, 09:47 PM   #5
CSP
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Head bolt sizes are different. For 81-84 they are 7/16" and all other years are 1/2".
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Unread 11-27-2013, 11:44 AM   #6
COBRA5LADDICT
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could i use the intake and exhaust manifold from my 81+ on the earlier 258? also i am mainly concerned with mounting points for alternator, power steering pump air pump etc.
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Unread 11-27-2013, 01:30 PM   #7
CSP
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Yes you can. My '75 has the later intake/exhaust manifolds.

The '73 block may or may not have the mounting bosses for the power steering pump brackets.
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