will FE blocks accept a 4.5" stroke?
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
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.
Cargo Master
Joined: Aug 2000
Posts: 2,931
Likes: 12
From: SW Michigan
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
Elder User
Joined: Apr 2005
Posts: 509
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From: UTI student
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
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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Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
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.
pretty cool that my FE stroker build is 446 cubes. but it's a .020 over 428 with the smaller 4.125" stroke.
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
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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FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
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???
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
Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
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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FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
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.
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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!!
