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Ford JC51

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norm
QtrWarrior
rmcomprandy
Calkins
68formalGT
gt350hr
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590KA
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Post  590KA December 2nd 2020, 6:50 am

Thought Id post some of these as Im probably the only one I know of that has done anything with this platform. Ive been running the cylinder head on a 250ci four cylinder in Comp eliminator and Im now building the first 500 that I know of and I have a lot of knowledge on this engine combo. Hopefully youll enjoy the pics. Comment away! Im new to posting here and dont have a clue if my pics will even post or not.

Ford JC51 Img_0110
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[url=https://servimg.com/view/20286276/9]Ford JC51 Img_4112
Ford JC51 Img_4113Ford JC51 Img_0111

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Post  stanger68 December 7th 2020, 5:30 am

Is that a motorsport head?

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Post  kpascoe December 10th 2020, 12:49 am

Clint,

So that's what your secret project is. It looks awesome. Guess that's what you needed all those crankshafts for. You building a B/A ?
I got my A/R Boss Hemi running. Waiting on a clutch.
Are you going to make it to Gateway for the big comp shootout in the spring?

Kent

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Post  Colt Macara December 10th 2020, 3:13 am

kpascoe wrote:Clint,

So that's what your secret project is. It looks awesome. Guess that's what you needed all those crankshafts for. You building a B/A ?
I got my A/R Boss Hemi running. Waiting on a clutch.
Are you going to make it to Gateway for the big comp shootout in the spring?

Kent

What date / time @ Gateway? You need track time? Take 2 weeks too tune that baby! Razz
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Post  590KA December 10th 2020, 3:48 am

stanger68 wrote:Is that a motorsport head?

I guess you could say motorsport head. Its one of 3 heads legal for Ford oro stock

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Post  590KA December 10th 2020, 3:49 am

kpascoe wrote:Clint,

So that's what your secret project is. It looks awesome. Guess that's what you needed all those crankshafts for. You building a B/A ?
I got my A/R Boss Hemi running. Waiting on a clutch.
Are you going to make it to Gateway for the big comp shootout in the spring?

Kent

Yes sir that's it! I'm planning on gateway but with the altered. This will be an AED deal but probably not done til spring

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Post  gt350hr December 10th 2020, 4:11 am

Jim Cunningham (rip) won the lottery twice and loved Fords. He worked with Ford and had this stuff made. Larry Morgan had the fastest engines I know of but the Mustang body held back the performance. Larry put one in his ( then ) Camaro ( carburetted days) and ran under the Pro Stock record. When Jim died the parts and development was bought IIRC by Westbrook racing engines well known for building Super Stock hemis. Tremendous power potential.

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Post  kpascoe December 10th 2020, 4:58 am

gt350hr wrote:   Jim Cunningham (rip) won the lottery twice and loved Fords. He worked with Ford and had this stuff made. Larry Morgan had the fastest engines I know of but the Mustang body held back the performance. Larry put one in his ( then ) Camaro ( carburetted days)  and ran under the Pro Stock record. When Jim died the parts and development was bought IIRC by Westbrook racing engines well known for building Super Stock hemis. Tremendous power potential.

He didn't buy "all" of the parts. I actually own Jim's old clutch resurfacing machine .

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Post  68formalGT December 10th 2020, 6:22 am

How many of those heads were cast and is there many of them still out there? They look like a damn good head.
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Post  590KA December 10th 2020, 6:28 am

68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Man Im really not sure. I have 8 raw castings and one more block left. Not much was made by what Ive found out.

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Post  590KA December 10th 2020, 6:31 am

gt350hr wrote:   Jim Cunningham (rip) won the lottery twice and loved Fords. He worked with Ford and had this stuff made. Larry Morgan had the fastest engines I know of but the Mustang body held back the performance. Larry put one in his ( then ) Camaro ( carburetted days)  and ran under the Pro Stock record. When Jim died the parts and development was bought IIRC by Westbrook racing engines well known for building Super Stock hemis. Tremendous power potential.

Larry Definitely had the best Ford Hemi JC50s but too my knowledge Larry nor Cunningham ever built one of these the JC51. RIP Jim he was a wonderful man!

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Post  68formalGT December 10th 2020, 6:38 am

590KA wrote:
68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Man Im really not sure. I have 8 raw castings and one more block left. Not much was made by what Ive found out.

Is there a Ford wedge head out there that compares to it, port height, valve angles, etc?
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Post  590KA December 10th 2020, 6:52 am

[quote="68formalGT"]
590KA wrote:
68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Man Im really not sure. I have 8 raw castings and one more block left. Not much was made by what Ive found out.

Is there a Ford wedge head out there that compares to it, port height, valve angles, etc?[/quote

You would have to compare it to the DRCE stuff but even then I think its even much better. Plus its More GM design cause number one bank is drivers side forward.

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Post  68formalGT December 10th 2020, 8:00 am

590KA wrote:You would have to compare it to the DRCE stuff but even then I think its even much better. Plus its More GM design cause number one bank is drivers side forward.
[/quote]

Like the RCV head? Do you have to move the lifter bores too?
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Post  590KA December 10th 2020, 8:03 am

68formalGT wrote:
590KA wrote:You would have to compare it to the DRCE stuff but even then I think its even much better. Plus its More GM design cause number one bank is drivers side forward.

Like the RCV head? Do you have to move the lifter bores too?[/quote]

No the block is set although a decent amount of push rod clearance work needs done to the head

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Post  Calkins October 14th 2022, 12:23 am

590KA wrote:Thought Id post some of these as Im probably the only one I know of that has done anything with this platform. Ive been running the cylinder head on a 250ci four cylinder in Comp eliminator and Im now building the first 500 that I know of and I have a lot of knowledge on this engine combo. Hopefully youll enjoy the pics. Comment away! Im new to posting here and dont have a clue if my pics will even post or not.

Ford JC51 Img_0110
Ford JC51 Img_0111

Clint, I sent you a message over on your LinkedIn account.  Who makes the billet Merc block that you are using in the altered?  Once I get a stock Merc block and Boss head combo nailed down in my FED, I would like to do injected Nitro with the billet block and head.
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Post  rmcomprandy October 14th 2022, 12:30 am

68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Supposedly, they can still be bought from Ford. None are in stock but, special casting runs are made and the customer will pay the cost..

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Post  68formalGT October 14th 2022, 12:36 am

rmcomprandy wrote:
68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Supposedly, they can still be bought from Ford. None are in stock but, special casting runs are made and the customer will pay the cost..

With the RCV and the Pegasus Engineering heads out there I don't think the extra cost would be worth the money unless you needed pro stock legal heads or wanted it to be a "Ford" head.
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Post  QtrWarrior October 14th 2022, 7:59 am

68formalGT wrote:
rmcomprandy wrote:
68formalGT wrote:How many of those heads were cast and is there many of them still out there? They look like a damn good head.

Supposedly, they can still be bought from Ford. None are in stock but, special casting runs are made and the customer will pay the cost..

With the RCV and the Pegasus Engineering heads out there I don't think the extra cost would be worth the money unless you needed pro stock legal heads or wanted it to be a "Ford" head.

To run in the Comp Eliminator Econo class.... Heads and block HAVE TO HAVE a Ford part number..
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Post  norm October 14th 2022, 9:24 am

68formalGT wrote:
With the RCV and the Pegasus Engineering heads out there I don't think the extra cost would be worth the money unless you needed pro stock legal heads or wanted it to be a "Ford" head.

These heads are available now? Not just a "talked about" but unavailable thing?
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Post  68formalGT October 14th 2022, 12:31 pm

norm wrote:
68formalGT wrote:
With the RCV and the Pegasus Engineering heads out there I don't think the extra cost would be worth the money unless you needed pro stock legal heads or wanted it to be a "Ford" head.

These heads are available now? Not just a "talked about" but unavailable thing?

There were RCV's last year when one of the Nebraska racers built an engine for this year and there was a post on book face about a pallet of Assassin heads less then a month ago. Oh and the Visner billet X460 is a pretty awesome head too, Derik Timmer has set a record with his new engine with the X460's and billet block
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Post  norm October 14th 2022, 11:30 pm

68formalGT wrote:

There were RCV's last year when one of the Nebraska racers built an engine for this year and there was a post on book face about a pallet of Assassin heads less then a month ago. Oh and the Visner billet X460 is a pretty awesome head too, Derik Timmer has set a record with his new engine with the X460's and billet block

I have seen the VED heads out there a bit. The other ones not so much.

And i'd rather manscape with a cheese grater than get on "bookface"
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Post  68formalGT October 14th 2022, 11:36 pm

norm wrote:
68formalGT wrote:

There were RCV's last year when one of the Nebraska racers built an engine for this year and there was a post on book face about a pallet of Assassin heads less then a month ago. Oh and the Visner billet X460 is a pretty awesome head too, Derik Timmer has set a record with his new engine with the X460's and billet block

I have seen the VED heads out there a bit. The other ones not so much.

And i'd rather manscape with a cheese grater than get on "bookface"

LOL, I don't think many people that have them go out talking a lot about them. From what I've seen a lot of people order blocks without lifter bores for the RCV heads.
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Post  supervel45 October 15th 2022, 3:19 am

Good going Clint. Cool


https://dragillustrated.com/neff-stuns-comp-eliminator-world-with-215-mph-production-gas-ford/

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Post  norm October 15th 2022, 3:58 am

supervel45 wrote:Good going Clint. Cool


https://dragillustrated.com/neff-stuns-comp-eliminator-world-with-215-mph-production-gas-ford/

Awesome article, thank you for posting that.
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