Jon Kaase SR71 Cylinder Heads

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Post  hbstang on August 16th 2018, 6:01 pm

good to see updates on great heads.are those numbers with out of the box ports?
i would like to see a hi-port version of your boss 9 heads!
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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on August 16th 2018, 6:38 pm

jonkaase wrote: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

Will this head be superseding the P-51 or are you planning to offer both in the future ...?

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on August 17th 2018, 3:04 pm

dfree383 wrote:
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

Anything they can claim so they have a head to compete with the A460's in X275
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Re: Jon Kaase SR71 Cylinder Heads

Post  dfree383 on August 17th 2018, 3:14 pm

Jon,

Do your new heads require custom valve reliefs or will the regular SCJ/P-51 pistons work?

Have you figured out a price point on them yet?

Great work too, just when AFR thought they had corner on the market, Bam ! Laughing Laughing

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Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans on August 17th 2018, 3:40 pm

dfree383 wrote:Jon,

Do your new heads require custom valve reliefs or will the regular SCJ/P-51 pistons work?

Have you figured out a price point on them yet?

Great work too, just when AFR thought they had corner on the market, Bam !  Laughing  Laughing


I predict most pistons will need a bigger dia. intake valve relief. The valve is 1/8" bigger than the std. P51.

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Re: Jon Kaase SR71 Cylinder Heads

Post  BBFTorino on August 17th 2018, 5:30 pm

Any flow test results yet??

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Re: Jon Kaase SR71 Cylinder Heads

Post  litshoot on August 18th 2018, 10:28 am

Can I have a set?

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Re: Jon Kaase SR71 Cylinder Heads

Post  Paul Kane on August 18th 2018, 11:37 am

Wow, nice.

What are the valve angles? Given the OEM port entry and exit shapes, and the talk of needing a larger valve pocket but not necessarily a new placement, I assume this head has essentially the SCJ valve angles and valve placements? If so, then it’s a very logical progression of the SCJ-style cylinder head.
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Re: Jon Kaase SR71 Cylinder Heads

Post  Paul Kane on August 18th 2018, 11:43 am

Oh and incidentally: oftentimes people point to the “poor exhaust flow” or “poor flow ratio” of the Ford heads and their need for a bigger exhaust valve. I’ve always felt that if one wants to make more power he should focus as much (or more) on the intake side.  Perhaps this head serves as a good example via its favoring a 2.375” intake valve and raised runner (etc) while retaining the 1.76” exhaust valve.  (Of course this may not be a great example if the valve angles are drastically changed from SCJ.)
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Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase on August 18th 2018, 1:52 pm

the valve angles are the same as the SCJ and P-51. The ex valve is a little closer to the bore. The intake valve is about the same place as P-51, just down toward the outside of the block about .050". It is possible they may clear a P-51 pocket but bigger diameter would be safer.

We are going to run these heads again this week on a 598 and a 521

The P-51 to me is a magic head and we are going to continue to make it. They have always been is short supply and I hope we have that issue resolved

The plan is to sell the SR-71 heads complete for $2995. That includes ARP rocker studs and guide plates. They use CHE bronze guides. The stainless valves are custom made just for these heads The intake comes already back cut and the exhaust has a 30 degree back angle. The Roller cam valve springs are Manley NexTek, 221443. They sell for $456 on Summit's site. Retainers , 10 degree super locks and spring seat locators are from Comp Cams. I just don't want any parts failures.

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FLOW

Post  jonkaase on August 18th 2018, 2:07 pm

OK,so I'm not a big airflow guy but here goes...

the intakes we have checked have been 430 to 465 at 28" on a 1020 Superflow bench. That is on a 4.6" bore flow fixture. The real good thing is they are about 400 cfm at .500" lift.

Exhausts are 305 with a 8" flow pipe. The exhaust is exactly the same on the outside of the head as the P-51. The difference is the window at the short turn is .250-.300 taller, the bowl being deeper.

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Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase on August 18th 2018, 3:52 pm

also, a roller cam with .460 lobe lift and 1.73 rockers will work great with these springs. The math says it won't but it works. .800" lift on paper is really .750-.760 with lash and flex. We have run this package past 8100 with no problem.

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Re: Jon Kaase SR71 Cylinder Heads

Post  glenevans on August 18th 2018, 5:21 pm

Is the block spacer included, or available separately? Awesome work on the new heads!

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Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase on August 18th 2018, 7:29 pm

we are supplying the china wall spacers with the heads. we will probably offer a valley plate as an option because the head has a good sealing surface at the inside deck but the aluminum costs more for a 3/8 plate that big.

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Re: Jon Kaase SR71 Cylinder Heads

Post  Gary Blair on August 19th 2018, 6:55 am

jonkaase wrote: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

Jon,
Is the TFS manifold you're using the Victor based AKA Mafia manifold?
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Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase on August 19th 2018, 10:33 am

yes, 4500 flange

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Re: Jon Kaase SR71 Cylinder Heads

Post  jonkaase on August 19th 2018, 10:35 am

I don't remember how to put pictures on here, or videos. If someone can guide me I will start posting some stuff.

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on August 19th 2018, 10:42 am

Jon, do you have a picture of this head next to an A460 head to show the overall height of the intake port?


Last edited by 68formalGT on August 19th 2018, 11:52 am; edited 1 time in total
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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on August 19th 2018, 10:53 am

Lem Evans wrote:
dfree383 wrote:Jon,

Do your new heads require custom valve reliefs or will the regular SCJ/P-51 pistons work?

Have you figured out a price point on them yet?

Great work too, just when AFR thought they had corner on the market, Bam !  Laughing  Laughing


I predict most pistons will need a bigger dia. intake valve relief. The valve is 1/8" bigger than the std. P51.

HOWEVER, it is moved away from the notch edge .050" more towards the exhaust side ... same angles but the pierce point is slightly different than the P-51.
So, maybe just slightly.

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Re: Jon Kaase SR71 Cylinder Heads

Post  DGS on August 19th 2018, 11:41 am

Jon, any future plans for a dedicated intake for this head? Maybe a tunnel ram? When will these heads be available to buy?
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Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans on August 19th 2018, 12:51 pm

rmcomprandy wrote:
Lem Evans wrote:
dfree383 wrote:Jon,

Do your new heads require custom valve reliefs or will the regular SCJ/P-51 pistons work?

Have you figured out a price point on them yet?

Great work too, just when AFR thought they had corner on the market, Bam !  Laughing  Laughing


I predict most pistons will need a bigger dia. intake valve relief. The valve is 1/8" bigger than the std. P51.

HOWEVER, it is moved away from the notch edge .050" more towards the exhaust side ... same angles but the pierce point is slightly different than the P-51.
So, maybe just slightly.

HOWEVER, I guy damn sure needs to check the intake valve for radial clearance.

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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on August 19th 2018, 1:22 pm

Lem Evans wrote:
rmcomprandy wrote:
Lem Evans wrote:
dfree383 wrote:Jon,

Do your new heads require custom valve reliefs or will the regular SCJ/P-51 pistons work?

Have you figured out a price point on them yet?

Great work too, just when AFR thought they had corner on the market, Bam !  Laughing  Laughing


I predict most pistons will need a bigger dia. intake valve relief. The valve is 1/8" bigger than the std. P51.

HOWEVER, it is moved away from the notch edge .050" more towards the exhaust side ... same angles but the pierce point is slightly different than the P-51.
So, maybe just slightly.

HOWEVER, I guy damn sure needs to check the intake valve for radial clearance.

YEP ...

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Re: Jon Kaase SR71 Cylinder Heads

Post  BBFTorino on August 19th 2018, 3:34 pm

jonkaase wrote:the valve angles are the same as the SCJ and P-51. The ex valve is a little closer to the bore. The  intake valve is about the same place as P-51, just down toward the outside of the block about .050". It is possible they may clear a P-51 pocket but bigger diameter would be safer.

We are going to run these heads again this week on a 598 and a 521

The P-51 to me is a magic head and we are going to continue to make it. They have always been is short supply and I hope we have that issue resolved

The plan is to sell the SR-71 heads complete for $2995. That includes ARP rocker studs and guide plates. They use CHE bronze guides. The stainless valves are custom made just for these heads  The intake comes already back cut and the exhaust has a 30 degree back angle. The Roller cam valve springs are Manley NexTek, 221443. They sell for $456 on Summit's site. Retainers , 10 degree super locks and spring seat locators are from Comp Cams. I just don't want any parts failures.
Just to clarify, these test mules are both standard 10.3" deck blocks??

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Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle on August 19th 2018, 3:56 pm

jonkaase wrote:I don't remember how to put pictures on here, or videos. If someone can guide me I will start posting some stuff.

Here you go...

http://www.429-460.com/t26524-pic-uploading-made-easy

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Re: Jon Kaase SR71 Cylinder Heads

Post  Gary Blair on August 20th 2018, 10:15 am

jonkaase wrote: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

Jon, I may have missed this somewhere, however what fuel did you use for your dyno runs?
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