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07-05-2009, 11:00 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 1
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426 cleveland stroker
1st cleveland and love it. any word on stroked 426 clevelands? need some feedback by Ford guys and not sales people. Thanks
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07-05-2009, 12:04 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,011
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Not Ranked
Sounds cool? Reliable?
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07-09-2009, 11:45 PM
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CC Member
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Join Date: Jul 2005
Location: San Tan Valley,
AZ
Cobra Make, Engine:
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Quote:
Originally Posted by bounty 1
1st cleveland and love it. any word on stroked 426 clevelands? need some feedback by Ford guys and not sales people. Thanks
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I assume you're referring to a 9.500 block?
The more motor you give a Cleveland head the better it likes it.
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07-10-2009, 05:20 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
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I don't think you can get there with a 9.200" block, and if you could, I wouldn't recommend it. Clevelands are not known for thick cylinder wall thicknesses. That much of a stroke would put a lot of side loading on the walls.
A lot of builders don't even like to go to 408 with Cleveland blocks.
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07-12-2009, 04:30 PM
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CC Member
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Join Date: Jun 2009
Location: Saratoga,
CA
Cobra Make, Engine: Factory Five replica and unknown replica
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426 cleveland stroker
Bounty 1,
I run Clevelands in my Pantera's and am just finishing up a 408 stroker. That's about as large as you can make a cleveland because of the deck height and wall thickness. If you're running the early 4V closed chamber heads with that combo you should be able to get 500 + horsepower and torque out of a 10.5 compression engine with right cam and a little head work.
If you need more cubes you're going to have to go to a Windsor or Clevor block like the Dart. You can take the 9.5 deck height Dart all the way to 454 cubes.
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07-12-2009, 07:25 PM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
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Short of finding one of the 'Rare' Siamese blocks designated for Nascar in the mid/late 70's that were cast in the USA then shipped to Aussie for machineing etc its a 'Risky Business' Im even more conservative than these guys when it comes to the production blocks, wont bore them past 4.030", wont build them with less than a 6" rod even at 3.5" stroke. Why, I learnt the hard way---- the more you stroke em the more they broke em' & I hate doing things twice for no good reason.
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Jac Mac
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07-12-2009, 08:57 PM
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Senior Club Cobra Member
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Join Date: Feb 2006
Location: Melbourne,
VIC
Cobra Make, Engine: RMC, carb 347 TopLoader and Jag running gear ~ so old school I time it with an hour-glass :D
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I think maybe its a reference to the new Boss351 block
http://www.autoblog.com/2009/06/13/f...-engine-block/
available in 9.2 & 9.5 deck height
from the article...
" Max stroke is up to 4.25" depending on crankshaft manufacturer with max bore size topping out at 4.125" with coolant cross drilling. A non cross-drilled block with increased bore capacity will be available by 3rd quarter."
guessing this would get you a 4.00 x 4.125 in a 9.2in block (?)
LoBelly
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07-12-2009, 09:09 PM
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Senior Club Cobra Member
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Cobra Make, Engine: Contemporary, FE, Tremec TKO 600
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Go over to the Cleveland forum, there's a guy named Tod Buttermore who has developed a new Cleveland block with an much improved main priority oiling system. It's supposed to accomodate significantly larger bore and stroke parameters than a standard Cleveland block, and it's available in both iron and aluminum.
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07-13-2009, 11:09 PM
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CC Member
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Join Date: Jun 2009
Location: Saratoga,
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Cobra Make, Engine: Factory Five replica and unknown replica
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Tod's block isn't ready yet but will have better oiling and the ability to go with a bigger bore but still has the 9.2 Cleveland deck height. The Boss 351 block is similar to the Dart World Style block and a bunch of Dart copies now coming in from China that are basically Windsor blocks with the Cleveland 2.75 main bearings and 4 bolt main bearing caps.
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07-19-2009, 03:01 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
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Shade Tree--
your comment "Dart copies now coming in from China " -- what have you seen >? are they showing up as off brands or are they trying to sell them as Dart/SVO/etc >?
--Steve
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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07-19-2009, 04:25 PM
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Quote:
Originally Posted by PANAVIA
Shade Tree--
your comment "Dart copies now coming in from China " -- what have you seen >? are they showing up as off brands or are they trying to sell them as Dart/SVO/etc >?
--Steve
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It looks just like a Dart Iron Eagle...Dick has stopped anyone from selling them, last I heard.
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07-20-2009, 12:16 AM
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Join Date: May 2008
Location: San Jose CA,
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Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
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There was a book out by George Reid that explained stroked small blocks, and there was some Cleavland info therein. I think there was a 426 possible with a 9.2" deck if memory serves.
http://www.amazon.com/Build-Big-Inch.../dp/1884089836
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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07-20-2009, 11:13 AM
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Quote:
Originally Posted by PANAVIA
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You could do it.
But you'd wake up screaming in a puddle of cold sweat for months afterward.
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07-20-2009, 12:22 PM
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CC Member
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Join Date: Jan 2004
Location: Wayne,
NJ
Cobra Make, Engine: Contemporary 482 all aluminum Tunnelport Self built and owned since 1980 frame#0000017 and owner of frame CCX 33961 looking for an FIA body to go with it
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Here is the only company making this kit and I hear that their quality is questionable.
http://www.speedomotive.com/ps-127-1...roker-kit.aspx
After speaking with many Cleveland builders no one recommends going over 4" stroke. Keith Craft only recommends 393's.
Tod Buttermore will also be producing a 9.5" deck block at some point which should get you 460ci, pair that up with some nice CHI heads and you should easily make 700hp. A 408 will get you over 600hp with these heads.
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Cobrarich
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07-20-2009, 11:37 PM
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Me, I'm with Keith.
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07-21-2009, 03:32 PM
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What is the problem? Are the cylinder walls cracking at a 4.0" or 4.1" stroke?
The piston compression height is shorter in a 347 than a 426 Cleveland would be.
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07-21-2009, 04:04 PM
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Location: Gore. New Zealand.,
SI
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Apart from the std clevo cyl wall thickness problem its stroke & rod ratio( and the resulting angle), not pin height that are the real issue.
On the 3.4" stroke / 5.4 rod this ratio is 1.588/1 with the 302 8.200" block.
Clevo with 4" stroke/6.125" rod is 1.531/1 in 9.2" block with 1.075 pin height.
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Jac Mac
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07-21-2009, 04:17 PM
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I see a lot of 4.0" stroke with 6.0" rods in 408 Clevelands (1.5 ratio).
A 426C with a 4.1" stroke and 6.0" rods is 1.46 ratio.
Does piston speed also play a role in the destruction of Cleveland cylinder walls?
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07-21-2009, 04:49 PM
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Senior Club Cobra Member
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Cobra Make, Engine: JBL now SOLD
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Yeah around 1.5 ratio is about the same as a stock BBC 454 which has 1.53....the bowtie bunch dont complain much....and they push a lot of power with them.
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6th generation Texan....
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07-21-2009, 05:08 PM
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CC Member
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Location: Gore. New Zealand.,
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Quote:
Originally Posted by racingrick
I see a lot of 4.0" stroke with 6.0" rods in 408 Clevelands (1.5 ratio).
A 426C with a 4.1" stroke and 6.0" rods is 1.46 ratio.
Does piston speed also play a role in the destruction of Cleveland cylinder walls?
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Its kinda hard to isolate piston speed, it comes with the territory in longer strokes & if the owner insists on pushing the RPM it does become a major factor. Depends on what the application is really, Put it in a class where the high RPM is not continous & the stroker will probably last, try it in a boat or circuit car ( Road course or Nascar long track types ) where high revs are for longer periods and the short rod combo will self distruct.
The best example that we probably have here is the SBF combos of: 4.125 bore X 3.25" stroke versus the 4.00" bore by 3.40" stroke. Both are the same capacity @ around 346/347 ci, but the short stroke/big bore motor can rev higher, yet really gives nothing away down low either.
Clevos are pretty popular down under with the Aussie Falcon crowd & an easy swap to a 6" rod ( The 302c had a 6" rod/3.00" stroke ) plus an Aussie 1.425" pin height piston makes a nicer motor out of the 351c & virtually eliminates the bore cracking problem.
One other problem the std 351c has, the std rod/piston combo pulls the piston skirt well below the cyl bore @ BDC, the 6" rod cures that, but it returns again if you lengthen the stroke, on the Jet Boats we worked with that ran continous @ around 5500 plus the piston skirt would get a very defined 'mark' on the skirt where the piston 'rocked' @ BDC largely due to the lack of bore support.
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Jac Mac
Last edited by Jac Mac; 07-21-2009 at 05:16 PM..
Reason: xtra info.
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