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Jon Kaase SR71 Cylinder Heads

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Post  Doug Rahn August 11th 2018, 8:27 am

I just watched a new episode of Geerz and his latest project is an old 1959 Ford panel truck. But the engine is a Jon Kaase built BB with his new SR71 cylinder heads Shocked I checked Jon's web site and saw no info on them. Maybe he'll see this and chime in.
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Post  enginetech August 11th 2018, 9:00 am

Maybe (finally), a worthy competitor to the SR-20? Though we will play hell getting it approved for use in those limited classes requiring “conventional” heads, whatever the hell that means.

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Post  Doug Rahn August 11th 2018, 9:28 am

Jon Kaase SR71 Cylinder Heads 20180811_092029
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Post  Lem Evans August 11th 2018, 10:50 am

Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.

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Post  enginetech August 11th 2018, 10:54 am

Lem,

Just how much are the intake ports raised?

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Post  bruno August 11th 2018, 11:11 am

https://staceydavid.com/projects/sr-71/

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Post  Doug Rahn August 11th 2018, 11:15 am

Lem Evans wrote:Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.

Good eye Lem. They dropped in a lifter valley plate then the manifold. They said it made 1027hp @6700 and 903tq @ 4600 with the TBS 871 blower on pump gas. He also said it had longer valves with a diameter of 2.375 In. and 1.76 Ex.

Jon Kaase SR71 Cylinder Heads 20180811_110315

Jon Kaase SR71 Cylinder Heads 20180811_105628
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Post  Lem Evans August 11th 2018, 11:53 am

Doug Rahn wrote:
Lem Evans wrote:Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.

Good eye Lem. They dropped in a lifter valley plate then the manifold. They said it made 1027hp @6700 and 903tq @ 4600 with the TBS 871 blower on pump gas. He also said it had longer valves with a diameter of 2.375 In. and 1.76 Ex.

Jon Kaase SR71 Cylinder Heads 20180811_110315

Jon Kaase SR71 Cylinder Heads 20180811_105628

It wasn't my eyes. Jon told me about the heads about a year ago.

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Post  Doug Rahn August 11th 2018, 11:58 am

Suspect LOL, I should have guessed you would be in the know.
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Post  wayney August 11th 2018, 12:27 pm

Lem Evans wrote:Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.


I have repeatedly said we needed a bbf head like this since the P51 came out . wonder if it uses a mafia intake or dedicated for this head?

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Post  BBFTorino August 11th 2018, 1:17 pm

Why does their 1959 panel truck look like a 1960 model??

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Post  jbozzelle August 11th 2018, 4:01 pm

https://i0.wp.com/staceydavid.com/wp-content/uploads/2018/08/Jon-Kaase-and-Stacey-.jpg?ssl=1

Jon Kaase SR71 Cylinder Heads Jon-Kaase-and-Stacey-



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Post  rmcomprandy August 11th 2018, 4:50 pm

[quote="Lem Evans"]
Doug Rahn wrote:
Lem Evans wrote:Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.

Good eye Lem. They dropped in a lifter valley plate then the manifold. They said it made 1027hp @6700 and 903tq @ 4600 with the TBS 871 blower on pump gas. He also said it had longer valves with a diameter of 2.375 In. and 1.76 Ex.


It wasn't my eyes. Jon told me about the heads about a year ago.

What I remember from talking about it at the PRI show was it was going to have an extended intake flange face so a regular CJ manifold would still fit. I hope that is still the case.

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Post  Lem Evans August 11th 2018, 6:04 pm

Looks like it may be time for a bigger dia. intake valve relief.

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Post  TravisRice August 11th 2018, 7:24 pm

Does look like the intake face is extended with the picture of Kaase and David. That's pretty slick.

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Post  Lem Evans August 11th 2018, 7:30 pm

TravisRice wrote:Does look like the intake face is extended with the picture of Kaase and David. That's pretty slick.

Extented,  kind of like the Edelbrock 7721 15* sbf head that's been around for years.

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Post  nascar429 August 11th 2018, 11:21 pm

Jon Kaase SR71 Cylinder Heads Sr-71-10

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Post  BBFTorino August 12th 2018, 1:34 am

Nice chambers. Are these heads set up to use the 18 bolt system??
Also, any preliminary flow test data on them??
For the expert builders.....where do these heads fall in the pecking order of the BBF cyl. head list??

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Post  Doug Rahn August 12th 2018, 7:22 am

rmcomprandy wrote:
Lem Evans wrote:
Doug Rahn wrote:
Lem Evans wrote:Raised intake ports. Requires china wall spacers like the 7721 edelbrock sbf head.

Good eye Lem. They dropped in a lifter valley plate then the manifold. They said it made 1027hp @6700 and 903tq @ 4600 with the TBS 871 blower on pump gas. He also said it had longer valves with a diameter of 2.375 In. and 1.76 Ex.


It wasn't my eyes. Jon told me about the heads about a year ago.

What I remember from talking about it at the PRI show was it was going to have an extended intake flange face so a regular CJ manifold would still fit. I hope that is still the case.

You are correct Randy. I went back and watched the video again and the blower intake used was a TBS off the shelf CJ unit and off the self headers with CJ pattern.
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Post  bruno August 12th 2018, 12:00 pm

BBFTorino wrote:Nice chambers. Are these heads set up to use the 18 bolt system??
Also, any preliminary flow test data on them??
For the expert builders.....where do these heads fall in the pecking order of the BBF cyl. head list??

x2

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Post  enginetech August 12th 2018, 10:04 pm

Not exactly competition for the SR20. What exactly is the gain (in hp) in raising the CJ intake port location for a typical N/A combination?

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Post  dfree383 August 13th 2018, 7:53 am

enginetech wrote:Maybe (finally), a worthy competitor to the SR-20?  Though we will play hell getting it approved for use in those limited classes requiring “conventional” heads, whatever the hell that means.

How conventional can they be if the factory valve covers and intakes wont even fit????

http://brodix.com/heads-2/big-block-chevrolet-compatible-heads/sr-20-series-cylinder-heads20
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Post  JBR-3 August 13th 2018, 9:29 am

.


Last edited by JBR-3 on October 17th 2020, 3:19 pm; edited 1 time in total (Reason for editing : .)

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Post  68galaxie August 13th 2018, 10:38 am

Cool looking heads.
What is the application for these heads (if they actually start selling them)?
Looks like they use standard Victor or Mafia intake manifolds.
Standard CJ exhaust flange - raised? I can't tell.

The P51 and new AFR head make 900+ hp - I would guess this will support more?

Where does the A460 fit in this picture?

Always fun looking at new cylinder head offerings or potential ones.

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Post  jonkaase August 16th 2018, 4:08 pm

OK, here is a little info:

we have been working on this head for 4 years
we have been tight lipped about it because I want to have a good supply of complete heads in stock before we advertise it
we have 100 castings here now, about 50 are completely machined
we do all the machining in house
we have valves and guide plates for them in stock
the valves are 2.375 x 5.7, and 1.76 x 5.32
the exhaust side of the head is same as P-51, the valve cover rail on the exhaust side is stock height
the intake side of the head is 1/2" higher than stock, but you can see the pictures, it's not very noticeable
the intake valve bowl is about 1/2" deeper
the exhaust valve bowl is about .300" deeper

We have done lots of dyno testing on a 598, 4.6 bore x 4.5, flat top pistons, 15 to 1, cam is 286-296-114, .460 lobe, Comp 1.73 steel stud mounted rockers with no stud girdle, wet sump, at times vacuum pump
the heads are unported but the chambers come cnc finished
the manifold is an unported Trick Flow for 4500 with big Dominator carb
the power has been 1080-1130HP, with the 1130 using a vacuum pump and port matched intake
some of the runs were never under 1060HP between 6100 and 7800 rpm

they are planned around a 4.5 to 4.625 bore
they will work on a 4.390 bore

I can answer any questions on this thread.... Kaase

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