I am stilling mapping out my forced induction journey and I am curious how much boost a stock 390 crank can handle? What about the rods? Forged pistons would certainly be in the recipe. Would an aftermarket crank and rods be necessary to get into the 15 psi range?
It isn't usually the crank that lets go. The rods or bearings go first. A forged crank is the best way to go or a high nodular iron crank like the 428CJ had.
Not according to Ford they aren't. Ford admits to nodular iron in the all their iron cranks, including the 406 and 427 iron cranks but the 428CJ/SCJ are the only ones they discribe as "high nodular controlled cast iron". So if they are the same, why say it is different?
I would put the best you can afford. Using a 35 yrs old cast crank will be a time bomb....it will fail sooner or later. Aftermarket rods would be a good step, as by the time you spend the money to "refurbish" old 390 rods(or whatever) you might as well spend the $600 for H beam rods.
Ya, I'm getting away with 35 yrs old parts in my junk, but there again I'm at 5-6# of boost and don't abuse it. It barely sees a pound of boost on a daily cruise. If I raced it...it'd be in pieces a long time ago!
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1967 F100 352/4spd
1969 F100 428CJ/4 spd
64 Galaxie with blown 390 4 spd
64 Galaxie wagon with 428 5 spd 2006 UMTR POWERSHIFT
POINTS CHAMPION
Not according to Ford they aren't. Ford admits to nodular iron in the all their iron cranks, including the 406 and 427 iron cranks but the 428CJ/SCJ are the only ones they discribe as "high nodular controlled cast iron". So if they are the same, why say it is different?
Well Ford invented the crankshaft grade pearlitic nodular iron in 1951 and held all patents for it. Acording to Dave Shoe at FE.com it's a pearlitic/ferritic blend for optimal bearing wear surface, ductility and fatigue resistance. And there are not many grades of crankshaft grade nodular available. Being Ford held the patent they could probably advertise whatever they wanted. But in reality they are indeed there is the same high nodular iron grade in all FE cranks. Now if they were austempered ductile iron that would be a differnet story.
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68 Mercury Cougar XR7. Sumthin FE under da hood.
Well Ford invented the crankshaft grade pearlitic nodular iron in 1951 and held all patents for it. Acording to Dave Shoe at FE.com it's a pearlitic/ferritic blend for optimal bearing wear surface, ductility and fatigue resistance. And there are not many grades of crankshaft grade nodular available. Being Ford held the patent they could probably advertise whatever they wanted. But in reality they are indeed there is the same high nodular iron grade in all FE cranks. Now if they were austempered ductile iron that would be a differnet story.
Ture Dat......True Dat LOL
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Wes Adams FORD428CJ
Built Ford Tuff With Good Ford Stuff
79 F-250 X-Cab 4x4 6.9 Turbo Diesel
64 Falcon X-Ram 428
55 FORD Truck 4-link Rides on air with X-Ram 428
67 Stang 351 C/J
2000 Yamaha V-MAX VMOA#4277
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