4.6 crank in a factory block?

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4.6 crank in a factory block?

Post  Hardy on September 26th 2017, 10:12 am

I'm looking into going bigger with my 507 over the winter. I know a 557 would be the more popular choice, but with Ohio Crankshaft offering their 4.6 stroke forged crank, I was wondering if
A) that will fit in my D1VE block? And
B) are there any other reasons not do it? Nothing to gain over the typical 4.5?

Also, with my ultimate goal being to run 9.2x or faster in a 3500# leaf sprung 72 Mach 1 (guessing I'll need about 900 hp at least), are the BT CJ heads I am currently using with raised Ford exhaust a viable option with porting? Or would selling them and upgrading to P51's be cheaper and easier in the long run?

I appreciate any help I can get guys. Thanks in advance

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Re: 4.6 crank in a factory block?

Post  Dave De on September 26th 2017, 7:23 pm

It may need a touch of clearancing with H beams but not much. D1VE blocks are short skirted so you will be pulling the pin way out the bottom. It would be nice to get a 6.8" rod but the compression height will be real short at 1.200"
I'd be looking for a deeper skirted block at  least a D9TE.

I'm almost 3300 pounds and running 9.0's in 1700 ft air with P-51's and a mild roller with a 4.50 stroke x 4.530 bore.
I wish I had a 4.30 crank.
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Re: 4.6 crank in a factory block?

Post  Hardy on September 27th 2017, 10:13 am

Good info. Thanks for the reply. We do have another block that my dad picked up a few years back. I'll have to check what that one is. I'm thinking in a factory block using stock port location heads there really wouldn't be any reason to go bigger than a 4.5 stroke anyway.
Your cars running pretty darn good! Sounds like your power plant would be about enough for what I'm tying to get. Hopefully with a 532 or 557 and a little more rpm I can get similar results.

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Re: 4.6 crank in a factory block?

Post  windsor on September 27th 2017, 10:18 am

Dave De wrote:
I wish I had a 4.30 crank.

Why is that?
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Re: 4.6 crank in a factory block?

Post  Dave De on September 27th 2017, 12:36 pm

Hardy wrote:Good info.  Thanks for the reply.  We do have another block that my dad picked up a few years back.  I'll have to check what that one is.  I'm thinking in a factory block using stock port location heads there really wouldn't be any reason to go bigger than a 4.5 stroke anyway.  
Your cars running pretty darn good!  Sounds like your power plant would be about enough for what I'm tying to get.  Hopefully with a 532 or 557 and a little more rpm I can get similar results.

Thanks for the compliment. I think it should be running 8.80's and it probably will with a few small changes next year.
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Re: 4.6 crank in a factory block?

Post  Dave De on September 27th 2017, 12:45 pm

windsor wrote:
Dave De wrote:
I wish I had a 4.30 crank.

Why is that?

At 580 cubes its a little big for P-51's in their current form. If it had a 4.3 crank the parts would match well. Future plans are to step on the heads, intake manifold, and some drive line changes to make this combination work better. I'd be happy running 8.90's in bad air but its just a bracket racer anyway always chasing. Its been a while since I've been chased.
It's been 9.08 at 148 with a full exhaust. 9.03 with open headers. The 4" exhaust weighs 70 pounds.


Last edited by Dave De on September 27th 2017, 9:30 pm; edited 1 time in total
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Re: 4.6 crank in a factory block?

Post  windsor on September 27th 2017, 2:01 pm

Makes sense, I'm debating myself whether to go 4.3 or 4.5 for my DragWeek deal (leaning towards the latter with A460's and a 4.65" bore).
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Re: 4.6 crank in a factory block?

Post  Racerrick on September 28th 2017, 1:02 am

I did a 4.6 Ohio crank this year it made 900hp at 6700 on a pump/avgas blend. Use a d9te block and the longest rod you can. 6.8 at least. I prefer a Molnar 6.85 dodge rod machined to fit. The long rod helps the piston stay up the bore. everything cleared with no grinding except the pistons needed a little touch. here is the one I did in the proven builds thread http://www.429-460.com/t26283-566-a460-head

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Re: 4.6 crank in a factory block?

Post  windsor on September 28th 2017, 7:37 am

^ yes, that’s a nice build
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Re: 4.6 crank in a factory block?

Post  Hardy on September 28th 2017, 10:18 am

Racerrick wrote:I did a 4.6 Ohio crank this year it made 900hp at 6700 on a pump/avgas blend. Use a d9te block and the longest rod you can. 6.8 at least. I prefer a Molnar 6.85 dodge rod machined to fit. The long rod helps the piston stay up the bore. everything cleared with no grinding except the pistons needed a little touch. here is the one I did in the proven builds thread http://www.429-460.com/t26283-566-a460-head

Yes, I remember seeing that one. Great job on your build!

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4.600 stroke in stock block

Post  lilcarlie on September 30th 2017, 7:36 am

Did 4.600 stroke in stock block recently zero clearancing.

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Re: 4.6 crank in a factory block?

Post  Dave De on September 30th 2017, 9:21 am

lilcarlie wrote:Did 4.600 stroke in stock block recently zero clearancing.

Which block was that?
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460 block

Post  lilcarlie on September 30th 2017, 8:57 pm

Block was from a 1978 lincoln

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Re: 4.6 crank in a factory block?

Post  BBFTorino on October 1st 2017, 12:46 am

So it is a D1VE block

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Re: 4.6 crank in a factory block?

Post  68formalGT on October 1st 2017, 11:41 am

Dave De wrote:
windsor wrote:
Dave De wrote:
I wish I had a 4.30 crank.

Why is that?

At 580 cubes its a little big for P-51's in their current form. If it had a 4.3 crank the parts would match well. Future plans are to step on the heads, intake manifold, and some drive line changes to make this combination work better. I'd be happy running 8.90's in bad air but its just a bracket racer anyway always chasing. Its been a while since I've been chased.
It's been 9.08 at 148 with a full exhaust. 9.03 with open headers. The 4" exhaust weighs 70 pounds.

Why not send the heads off and have them worked on?
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Re: 4.6 crank in a factory block?

Post  Dave De on October 1st 2017, 9:54 pm

68formalGT wrote:
Dave De wrote:
windsor wrote:
Dave De wrote:
I wish I had a 4.30 crank.

Why is that?

At 580 cubes its a little big for P-51's in their current form. If it had a 4.3 crank the parts would match well. Future plans are to step on the heads, intake manifold, and some drive line changes to make this combination work better. I'd be happy running 8.90's in bad air but its just a bracket racer anyway always chasing. Its been a while since I've been chased.
It's been 9.08 at 148 with a full exhaust. 9.03 with open headers. The 4" exhaust weighs 70 pounds.

Why not send the heads off and have them worked on?

I will be making these heads flow to match the cubes in the bottom end before next spring if ll goes well. The car went 9.03 this morning in 1,000 ft air with the exhaust on. Not bad for old backup slicks, blowing thru the converter in second gear, and two smashed primary header tubes. I need to update more than the heads but that's the worst of it.
Back to the 4.6 crank.
I wouldnt do it unless the heads were the newer TFS A heads.
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