Scat/Motorsport 4.300 cast crank

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Scat/Motorsport 4.300 cast crank

Post  JBR-3 on January 22nd 2016, 5:55 pm

This is the crank with the 2.500 BBF rod journal.

Has anybody broken one ?

How much power, or , what did it take to break it ?

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Re: Scat/Motorsport 4.300 cast crank

Post  BOSS 429 on January 22nd 2016, 7:17 pm

JBR-3 wrote:This is the crank with the 2.500 BBF rod journal.

Has anybody broken one ?

How much power, or , what did it take to break it ?

there were some guys around here making 750/800 with those no problems so far
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Re: Scat/Motorsport 4.300 cast crank

Post  Paul Kane on January 25th 2016, 12:34 pm

JBR-3 wrote:This is the crank with the 2.500 BBF rod journal.

Has anybody broken one ?

How much power, or , what did it take to break it ?
Haven't broken one, just want to state the following: that crankshaft has, 1) more journal overlap at its widest dimension, and, 2) more total area of journal overlap, than the common 4.14" stroker. It wouldn't surprise me if one could handle up to 1000 hp in the right hands.
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Re: Scat/Motorsport 4.300 cast crank

Post  JBR-3 on January 25th 2016, 3:15 pm

Thanks gents, I suspected it could be pretty reliable.

Don't read much about them, one way or another.

I had mine offset to 4.375 stroke, Mopar rod journal.

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Re: Scat/Motorsport 4.300 cast crank

Post  dfree383 on January 25th 2016, 3:39 pm

Baring Bad machine work or some other issue, I'd think that crank is probably stronger than a stock 2 bolt block.
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Re: Scat/Motorsport 4.300 cast crank

Post  Mark Miller on January 26th 2016, 2:33 am

Isn't this the crank that uses the stock 6.605" rods,are there many of these cranks out there?In the future i would think about going this route as i could use the Eagle H-Beam rods in my current 466.

Thanks Mark.

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Re: Scat/Motorsport 4.300 cast crank

Post  dfree383 on January 26th 2016, 8:01 am

Mark Miller wrote:Isn't this the crank that uses the stock 6.605" rods,are there many of these cranks out there?In the future i would think about going this route as i could use the Eagle H-Beam rods in my current 466.

Thanks Mark.

I'm not sure these cranks are being manufactured any more, ford had a bunch of them made and liquidated them a few years back when they discontinued the big block crate engine program
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Re: Scat/Motorsport 4.300 cast crank

Post  Mark Miller on January 27th 2016, 12:42 am

dfree383 wrote:
Mark Miller wrote:Isn't this the crank that uses the stock 6.605" rods,are there many of these cranks out there?In the future i would think about going this route as i could use the Eagle H-Beam rods in my current 466.

Thanks Mark.

I'm not sure these cranks are being manufactured any more, ford had a bunch of them made and liquidated them a few years back when they discontinued the big block crate engine program

Thanks i thought they might have quit making them,i guess if i ever build a stroker motor i'll keep my eyes out for a used one.

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514/521 crank.

Post  blown473 on February 1st 2016, 12:12 am

I'm running one of these crankshafts in my blown 521, in my humble opinion if your going to run a cast crank this is the best one there is. More strength at the rod journal 2.50 vs 2.20, big difference. It's a M6303-A514 part number if I remember correctly. 4.3 stroke std 3 inch main, std 2.5 rod journal & uses the 6.605 std rod length. Ford Racing did use the 990 pin in the pistons with the rods in their kit.

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Re: Scat/Motorsport 4.300 cast crank

Post  maverick on February 1st 2016, 4:12 pm

Been running one since 2002. Got a bazillion passes on it. Cool
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Re: Scat/Motorsport 4.300 cast crank

Post  JBR-3 on February 2nd 2016, 11:19 am

Blown473,
Good to hear that crank holding up with the blower drive.

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Post  blown473 on February 2nd 2016, 9:17 pm

Funny, I've built two blown 385 series, a 460 with a factory cast crank, and my current 521 with Ford Racing's cast crank, never , ever had an issue with the snout on either. Never had an issue in the 80's with a blown 351W either. Sometimes I think the snout deal is over hyped as most guys I know running blown are using standard snout cranks whether they are running Ford's or another brand. Just don't over tighten the belt and put unnecessary pressure on the snout.

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Re: Scat/Motorsport 4.300 cast crank

Post  Paul Kane on February 3rd 2016, 12:00 pm

JBR-3 wrote:
I had mine offset to 4.375 stroke, Mopar rod journal.
Chrysler LY rod bushed to 0.990" pin, then just add a 1.35" BBF stroker piston. Cool. Cool
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Re: Scat/Motorsport 4.300 cast crank

Post  JBR-3 on February 4th 2016, 11:39 am

Precisely, Mr. Kane !

Several decent 440 rods out there, and yes, I would definitely use a .990 pin.

I like the hemi-length 6.86 rod. That would use a 1.25-1.26 CH shelf piston,
same as you would use with a 4.5 stroke/6.8 rod combo.

4.375 stroke and 4.390 bore = 529 inches. Kind of a neat number.

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