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Old 08-29-2010, 11:16 AM
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Redtorino007

Hello I own a 1966 A code mustang nightmist blue with black vinyl top. The original 289 block was cracked beyond repair. I found a 1966 block and had a new engine built around that. I have 2 questions, does that deflect the originality of the car? I have won 2 judged contests (1st and 2nd) from Mustangs NW judges. Also Question 2; the engine builder (accidently) placed a 351 cam in the engine instead of the original 289 cam. I enjoy the sound but am not comfortable that the engine will will last. Also what kind of power changes can I expect from the 351 cam beside just the firing ordered changed. Thanks

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Old 08-29-2010, 02:37 PM
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351 firing order cam hurts nothing, actually helps reduce crankshaft harmonics. Ford switched the 302 to the 351 order when they came out with the 302 HO sometime around 1980. You have nothing to worry about.

Can't tell you about power differences without knowing if the 351 cam has different duration and lift than the original cam. Do you know the cam specs?? Or part #?? Could be the same as stock with just a different firing order, or could be bigger.

I don't have a clue about the block affecting value, but it isn't looked upon as such a big deal as it was 20 years ago. If you have the corrct year and date code block most don't care, but I don't know how anal the mustang guys might be.

I do know corvette guys are real anal, and the rarer/higher hp the engine the more anal they are. The more common lower hp engines aren't worried about so much. If yours was a K-code I would think they would be more concerned about the block.
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Old 08-29-2010, 03:24 PM
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Honestly imo numbers matching on that car doesn't mean much. It would have been worth more with a 5.0 HO swap with efi. It has to be a pretty rare car for numbers matcching to matter at all, and even then a modern update can still improve value unless its a super rare engine (boss 302 for example).

Some shows are judged on originality though and there it could matter.
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Old 08-29-2010, 03:32 PM
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ahhh the Boss 302.....I love that car my dad did a ground up restoration on a 69', original block all original internals, same trans etc...wierd thing about it he sold the car the moring of 9/11 O.O
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Old 08-29-2010, 05:36 PM
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For what it's worth the only difference in the A code and the C code engine visually is the A code has the 4v intake and the C code has a 2v intake.JMO
If i am not mistaken the A code did have a set of flat-top pistons can't remember but seems there was a slight difference with the cam specs also but don't hold me to that. Every thing else was the same, So if you add the factory 4V Intake to the 66 engine you have now nobody will know. But if you go and sell the car then you will need to be up-front and tell them about the engine swap. IMHO


Cole
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