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05-03-2015, 07:39 AM
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CC Member
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Join Date: Jun 1999
Location: Boulder,
CO
Cobra Make, Engine: None. Yet.
Posts: 104
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Not Ranked
What's a fair offer for this rebuilt 428 short block?
I'm giving some consideration to building an engine while I wait for my Cobra. I have zero FE building experience but I've got time and interest in learning. The following came up for sale locally and I'm wondering 1) if it's made with quality parts 2) what it's worth.
C6ME 428 block, date code 5K4, new Forged Speed Pro L2303 .040 pistons, new SpeedPro Plasma Moly rings, 1M crank @ .030 / .030. Rebuilt by reputable local machine shop.
Any insight is much appreciated.
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Member since 1999 - and I still don't have a Cobra!
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05-03-2015, 07:55 AM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Not Ranked
I saw that on the FE forum also. It's an OK deal. The part about the previous balancing was a little confusing. It said it was previously balanced. Does that mean that the new pistons have been rebalanced? If I was local I would go look at it and make my assessment from there. At $1500 its a great deal if everything is correct. At 2k it's a pretty good deal. At $2500 it had better all be right. JMHO
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05-03-2015, 07:58 AM
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CC Member
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Join Date: Jul 2003
Location: West Bloomfield,
MI
Cobra Make, Engine:
Posts: 717
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Given the current cost for a real 428 block you might have a couple grand worth of parts there....
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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05-03-2015, 08:02 AM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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,,,, a 428 block at .040 is pretty much at the end of it's life cycle. I've seen them at .060 but wouldn't trust it.
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05-03-2015, 08:19 AM
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CC Member
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Join Date: Jun 1999
Location: Boulder,
CO
Cobra Make, Engine: None. Yet.
Posts: 104
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Not Ranked
Thanks for the input. It's local and thus struck my interest, but it seems that there are probably better option out there.
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Member since 1999 - and I still don't have a Cobra!
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05-03-2015, 08:51 AM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Not Ranked
I would not blow it off. Go look at it if for no more than the experience. You'll have something to compare for the future. Offer him a lower number if you want it. All he can say is no. If you have little FE knowledge, this is a good way to learn. again,,, JMHO
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05-03-2015, 10:25 AM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Just an FYI, the C6ME-A number was used on 390, 428 and 428 CJ blocks.
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All that's stopping you now Son, is blind-raging fear.......
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05-03-2015, 01:23 PM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 923
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For not much more you could build a new stroked 390
Short block with new parts.
Jon
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05-03-2015, 08:32 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
measure the bore and stroke
Dwight
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life's goal should be; "to be smarter than inanimate objects"
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05-04-2015, 06:11 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,285
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................
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Too many toys?? never!
Last edited by undy; 05-04-2015 at 06:14 AM..
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05-04-2015, 06:13 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,285
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Was it sonic checked?
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Too many toys?? never!
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05-04-2015, 07:35 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
I am talking from experience: .040 is too much on a 428. I had one and it was almost impossible to drive thru a restraurant without my thermostat spiking to 220 or so. Had a custom Radiator made, even replaced my Edelbrock Water Pump but nothing helped. That engine only had a modest hydraulic cam and I could not keep it running cool.
Find a good 390 (has a zero balance crank) and build it up a little and you will be much happier. .030 would be the most I would push and FE. My 427 is punched on .015 so if I have to clean it up I have some room.
Think twice about that .040 428.
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05-04-2015, 02:01 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Couldn't agree more with Clois on his comments. Know what you are buying and do some homework. Nothing worse than having a "lump" sitting in the garage that you want to kick every time you walk by it! 
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All that's stopping you now Son, is blind-raging fear.......
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