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04-29-2008, 12:18 AM
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#1 |
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mopar crank
Can an 318 crank be legally used in a 340? They both have the same stroke and bearing sizes
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04-29-2008, 08:54 PM
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#2 |
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Re: mopar crank
Yes.
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Nautilus Racing |
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04-29-2008, 09:20 PM
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#3 |
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Re: mopar crank
It will fit, but it may not balance properly. 340 cranks have a hole through the rod journal to offset the piston/rod weight. Also most 340 cranks are steel and most 318 cranks are cast and externally balanced. Find a steel 340 crank and do it right, you'll be better off in the long run.
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04-30-2008, 11:38 AM
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#4 | |
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Re: mopar crank
Quote:
All 318 cranks, cast and steel, are internally balanced, as are 340 steel cranks. (All have neutral balancers/dampers & converters.) Only the 340 cast crank is externally balanced (and 360's). But balance will need to be checked anytime you start swapping parts around. 340 pistons are obviously heavier than 318 parts. I use to hear that the steel 318 truck crank was a good, strong piece because it didn't have the journal holes.
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LOCOMOTION Racing |
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04-30-2008, 07:42 PM
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#5 |
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Re: mopar crank
Thanks Myron,
I didn't kow that. I always thought all the LA cast crank motors had external balance. I have also heard the 318 steel truck crank was a good piece. What was the last year for that? George |
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04-30-2008, 09:38 PM
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#6 |
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Re: mopar crank
Its a chore but you can drill the holes in the journal just like the 340 cranks, we have done it several times.
Bill Lamb |
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04-30-2008, 10:03 PM
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#7 |
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Re: mopar crank
George,
Sorry, I don't know the last year for the truck cranks. I may still have one with a damaged thrust surface. Cast is also lighter than steel, so that may have something to do with the need for external balance on the cast 340's and 360's. Not sure what they did with the 318's, unless the pistons got lighter.
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