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post #1 of 11 (permalink) Old 04-15-2010, 11:12 PM Thread Starter
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crank & rods

steel truck crank 4.250 stroke std.mains and 2.1 rods.chromed.c/a 6.775 rods new.750$+shipping.
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post #2 of 11 (permalink) Old 08-16-2010, 08:46 PM
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steel truck crank 4.250 stroke std.mains and 2.1 rods.chromed.c/a 6.775 rods new.750$+shipping.
only rods?

thank you
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post #3 of 11 (permalink) Old 08-16-2010, 09:59 PM
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That's an odd ball stroke. What would that end up making with say a .030 piston? I'm guessing pistons would have to be custom as well to make anything work.
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post #4 of 11 (permalink) Old 08-16-2010, 10:26 PM
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That's an odd ball stroke. What would that end up making with say a .030 piston? I'm guessing pistons would have to be custom as well to make anything work.
Hopefully the OP doesn't mind if I comment here......

The combination is more oldschool than oddball, and a pretty sweet deal for a custom stroke forged crank. Displacement would be 514 with +.030. You could use this crank/rod combo with a piston that has a 1.42 compression hieght (which I know Diamond offers as an off-the-shelf/pre-engineered deal). Total stack would be 10.325, so a later block with a slightly thicker than normal head gasket would also be needed. You could also have the pin location altered on that piston for a minor upcharge if you needed to stick with 10.300.

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post #5 of 11 (permalink) Old 08-16-2010, 10:44 PM Thread Starter
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Hopefully the OP doesn't mind if I comment here......

The combination is more oldschool than oddball, and a pretty sweet deal for a custom stroke forged crank. Displacement would be 514 with +.030. You could use this crank/rod combo with a piston that has a 1.42 compression hieght (which I know Diamond offers as an off-the-shelf/pre-engineered deal). Total stack would be 10.325, so a later block with a slightly thicker than normal head gasket would also be needed. You could also have the pin location altered on that piston for a minor upcharge if you needed to stick with 10.300.
dont mind at all Carl,thanks for a very good answer to the questions.this is one way we had to do it before all the scat & eagle stuff made it's way on the market.i'v had the crank a while and found the new c/a rods and thought it'd make a decent package sometime but i'm looken to go bigger now.thanks again Carl.
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post #6 of 11 (permalink) Old 08-16-2010, 10:58 PM
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Thanks Carl, It's always a pleasure to learn from the Pro's.....
Rob

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post #7 of 11 (permalink) Old 08-16-2010, 11:07 PM
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sweet. I never realized this was a better way to make a 514. Now to see if I can scrape up the funds for this before they are gone.....
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post #8 of 11 (permalink) Old 08-17-2010, 01:29 AM
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Agree, no such thing as "oddball." It's simply not an offshore "cookie cutter" stroker kit. You can bore and stroke an engine however you wish.

To add to Carl's points: given the 3.59" stroke fo the forged 429 truck crankshafts, a 2.100" rod journal allows only up to 3.975" theoretical stroke without welding. In order to achieve 4.250" stroke, this crankshaft had to be welded on the rod journals, offset stroked to 4.250", and then chromed over (as noted in the original post). Not an uncommon practice back in the day.

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post #9 of 11 (permalink) Old 08-17-2010, 08:25 AM
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Agree, no such thing as "oddball." It's simply not an offshore "cookie cutter" stroker kit. You can bore and stroke an engine however you wish.

To add to Carl's points: given the 3.59" stroke fo the forged 429 truck crankshafts, a 2.100" rod journal allows only up to 3.975" theoretical stroke without welding. In order to achieve 4.250" stroke, this crankshaft had to be welded on the rod journals, offset stroked to 4.250", and then chromed over (as noted in the original post). Not an uncommon practice back in the day.

Paul
Wow, Lotta work....Why not just punch it to +.080"? Unless they wanted the bore/stroke ratio to work at a certain RPM?
Rob

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post #10 of 11 (permalink) Old 08-17-2010, 09:39 PM Thread Starter
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Wow, Lotta work....Why not just punch it to +.080"? Unless they wanted the bore/stroke ratio to work at a certain RPM?
Rob
back in the day .060 over was the max for most.more stroke is good,more bore is weaker block,run's hot,and a 460 was already a huge bore for "the day".a 4.25 stroke was very common for most brand bb's "in the day".thanks
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post #11 of 11 (permalink) Old 08-17-2010, 11:52 PM
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Thanks Cool, you'd think that I'd know that.....being from "back in the day". LOL
Rob

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