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BOLTS AND SPLINE

moparsquid

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Location
spring valley ,ca.
I have a chance to buy a 8 bolt max wedge crank for a great price but for a few dollars more I can get a lightweight crank from 440 source and im sure its 6 bolt I plan to do a little strip time which would be better also can I get away with using a 23 spline tranny vice 18 spline expensive trannies or could I buy a 23 spline and change over with parts from Brewers thanks
 
Tranny wise, I would find a decent 18 spline as there is quite a few parts to change to make it an 18 spline. Cost effective wise, its probably better than buying a 23 and converting if that's the way you wanna go 18 spline. I have beat on mine pretty good and my 23 spline is fine, but the hard launches at the track with slicks might break parts eventually. the 23 spline will take a good amount of abuse.
 
My real max crank is a six bolt, the eight bolt is almost certainly a hemi crank. No big, they interchange. But if i was buying a crank, i would prefer to buy a new one, rather than an unknown-how-abused, fifty yearold one. (And i would take the opportunity to buy a stroker crank!)
 
My real max crank is a six bolt, the eight bolt is almost certainly a hemi crank. No big, they interchange. But if i was buying a crank, i would prefer to buy a new one, rather than an unknown-how-abused, fifty yearold one. (And i would take the opportunity to buy a stroker crank!)

Or one of the early (59-61) extended flange wedge cranks... Those used eight holes but they are not threaded...
 
There is no converting a 23 to an 18. Lots of differences. 23 will hold up on the street pretty well. Drag strip under some abuse. I’ve run a fair amount of mid 12 passes with zero issues. The clutch, tires and weight are the big issues. I have nearly every part to build a slick shifted 18 spline. Every gear is brand new. PM me if interested.
Doug
 
the part number goes to a 426 max wedge the crank came out of an engine that was in BOB ELLIOTS 63 plymouth
 
the part number goes to a 426 max wedge the crank came out of an engine that was in BOB ELLIOTS 63 plymouth

Max wedge & Hemi use the same crankshaft forging, the differences are in the machining... Max Wedge was 6 bolt, Hemi 8 bolt... Lots of parts swapping happened in race cars...
 
I would rather have a lightweight 440 Crank! New. and with the right pistons & rods
you can keep that mass down.
 
im leaning to the 440 source light weight its not to much more and its new and most likely get higher revs
 
Me personally I don’t care about light weight as I care more where it’s made and the quality. I’ll take the old crank! Clean it up , check it out , machine as needed and balance to a good rotating assembly and you just recycled another part and let China lose again. IMO
 
Also there is an 8 bolt steel crank that was used in a big truck application in an industrial 413.
 
For the crank, the real issue with a factory BB crank is if it is a stock undercut fillet style. As far as I know the Hemi cranks were the ones that used a radius fillet design. Not sure about the "truck" cranks. I used up many stock 440 cranks (7000+ RPM, never broke one, but they eventually cracked, did break a main cap). The alloy would make some difference. IMHO 8 bolt vs 6 bolt doesn't seem to make much difference.
Never heard anyone really complain about the quality of 440 Source cranks, but I don't have one.
 
Street Hemi cranks had undercut fillet. Kellogg crank had radius fillets. The truck 8 hole crank may extend out the back of engine and won't work in cars. Not positive on that.
 
Street Hemi cranks had undercut fillet. Kellogg crank had radius fillets. The truck 8 hole crank may extend out the back of engine and won't work in cars. Not positive on that.
Guess I may be wrong, but the '70 street Hemi crank I looked at had radiused fillets.
Other than 8 crank bolts, what was different about a Hemi crank?
 
im leaning to the 440 source light weight its not to much more and its new and most likely get higher revs
—-
On my RB 505 I went with the 440 source lightweight crankshaft. I chose to go that route for the reduced rotating mass weight as well. So far so good.
 
Nothing different. Had a chance to buy a Kellogg crank. A dealer closed and my near by dealer took the stock. Called a friend that worked at closed dealer said crank was to bent so they didn't use it.
 
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