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Old 05-23-2005, 03:41 AM
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highboy 74 highboy 74 is offline
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will FE blocks accept a 4.5" stroke?

Will all Fe blocks accept a 4.5" stroker crank? I would love to use one in my 390 block.
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74 F-250 4x4 390 770 street avenger mated to T18 4spd and NP205 410 gears

65 F-100 300 six polished and ported head with a headman header and clifford intake and holley 390 4bbl
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Old 05-23-2005, 05:04 AM
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Nope !!! There's not enough clearence between the main saddle's and the bottom of the cylinder's...

Russ
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Last edited by RapidRuss; 05-23-2005 at 05:07 AM.
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Old 05-23-2005, 10:46 AM
rusty70f100 rusty70f100 is offline
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Maybe you could do some grinding and clearance it? I seem to remember hearing about a 4.375" stroke FE motor...
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Old 05-23-2005, 01:35 PM
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I saw a crank from shelby enterprises that was 4.5". Will the 4.375" crank fit?
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65 F-100 300 six polished and ported head with a headman header and clifford intake and holley 390 4bbl
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Old 05-23-2005, 02:28 PM
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Your right Shelby sells billet steel cranks up to a 4.500 stroke. I'm not sure what issues would be involved dropping this into a std FE block but would imagine some clearance work would be needed. G.
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Old 05-28-2005, 10:23 PM
Dino@his Dad's Dino@his Dad's is offline
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long stroke cranks

High74, Yes, there are 4 and 1/2 inch stroke cranks available. They are carved out of a chunk of billet and are horrifically exspensive. How much clearancing, if any you need to do to run one, I'm not sure. I would imagine you might need a reduced base circle cam and capscrew rods to make it work. VERY big money. Do you really need that much stroke ? Your 390 has 3.784 stroke now. You can offset grind and get 4.00 easily. You can also purchase a new crank from Scat that has 3.98 or 4.00 or 4.125 or 4.250 stroke. Mickey Thompson used to sell cast cranks with a 4.405 stroke, and Ford made some 4.385 stroke cranks for the Starlifter project. But that was back in the early 60s. The Scat cranks are around now, and for about 600$. Street Rodder built a stroker 390 with a 4.125 crank that was making an easy 520 lbs-ft of torque without any trouble at all. One of the fellows on the net54 forum built a 390 with the 4.250. He used aftermarket capscrew rods that had a 2.200 big end. He loves it. DF, @ his Dad's house
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Old 05-28-2005, 10:44 PM
hatemakings/n hatemakings/n is offline
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just curious but what would a 4.25 crank give you (cubes wise) on a 40 over 390?
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Old 05-28-2005, 11:06 PM
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446.70", with that small bore valve shrouding will be a problem as well as small chambers with a 4.25" stroke. Go with a 427 block, MR heads (88cc) and get streetable compression for a 482".
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Old 05-28-2005, 11:07 PM
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I guess... 446.7
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Old 05-28-2005, 11:14 PM
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carl, good that we both came up with the same number :-) (posted about the same time I guess)


pretty cool that my FE stroker build is 446 cubes. but it's a .020 over 428 with the smaller 4.125" stroke.
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Old 05-28-2005, 11:34 PM
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But your larger bore will help it breathe better plus you can run larger valves without notching the bore. Now a 4.375" square motor (526) would be great but it might suffer from emphysema unless there are some good flowing heads and intake to install. I'm stuck on 482", want 600 tq, 425-440 hp.
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Old 05-29-2005, 02:09 AM
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So your saying that a 4.375 stroke and a 4.375 bore would not breath properly??? Even with a set of edelbrock stage II heads and larger valves???
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65 F-100 300 six polished and ported head with a headman header and clifford intake and holley 390 4bbl
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Old 05-29-2005, 06:59 AM
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Quote:
Originally Posted by highboy 74
So your saying that a 4.375 stroke and a 4.375 bore would not breath properly??? Even with a set of edelbrock stage II heads and larger valves???
Highboy, you would be just fine..and it would make an A$$ kickin motor being squared Motor with 4.375" bore and Stroke...With KC's stage II heads and a Port matched Intake....

My Big Cobra (motor) build is 385 base block (D1VE) with a 4.390" bore with a 4.300" stroke...and it should work just fine!!

Russ
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Old 05-29-2005, 12:53 PM
"Beemer Nut" "Beemer Nut" is offline
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I did state "unless there are some good flowing heads and intake". Wouldn't that mean not stock small port and valve 360 / 390 heads and intake like a Performer feeding 482" motor. I give up, sorry.
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Old 05-29-2005, 01:50 PM
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RapidRuss RapidRuss is offline
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Quote:
Originally Posted by Beemer Nut
I did state "unless there are some good flowing heads and intake". Wouldn't that mean not stock small port and valve 360 / 390 heads and intake like a Performer feeding 482" motor. I give up, sorry.
.....=o&o>.....

Hey Carl.....I wasnt knocking what you said....I just meant to Verify what you had allready said...... Everything is good!!

Russ....Looking for my ever elusive Beer!!
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Old 05-29-2005, 01:50 PM
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