Jon Kaase SR71 Cylinder Heads

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on February 4th 2019, 12:01 pm

Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.
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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on February 5th 2019, 10:00 am

68formalGT wrote:
Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.

The "C" head was merely a C3 small block "Yates" NASCAR platform cylinder head made larger to fit the big block engine size.

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on February 5th 2019, 10:12 am

rmcomprandy wrote:
68formalGT wrote:
Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.

The "C" head was merely a C3 small block "Yates" NASCAR platform cylinder head made larger to fit the big block engine size.

As well as it worked I wonder why they never made a Cleveland head larger to fit a big block? Was it because the Cleveland was banned in NASCAR?
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Re: Jon Kaase SR71 Cylinder Heads

Post  c.evans on February 5th 2019, 11:10 am

68formalGT wrote:
rmcomprandy wrote:
68formalGT wrote:
Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.

The "C" head was merely a C3 small block "Yates" NASCAR platform cylinder head made larger to fit the big block engine size.

As well as it worked I wonder why they never made a Cleveland head larger to fit a big block? Was it because the Cleveland was banned in NASCAR?

You could say that the Ford E-460 Pro Stock head was a "Cleveland head"for a big block. While it was a porters head, it had the basic construction for a canted valve head. Probably more accurately, we could go back in time and call the TFS A-460 heads a "Cleveland head" for a big block.
Charlie

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on February 5th 2019, 11:59 am

c.evans wrote:
68formalGT wrote:
rmcomprandy wrote:
68formalGT wrote:
Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.

The "C" head was merely a C3 small block "Yates" NASCAR platform cylinder head made larger to fit the big block engine size.

As well as it worked I wonder why they never made a Cleveland head larger to fit a big block? Was it because the Cleveland was banned in NASCAR?

You could say that the Ford E-460 Pro Stock head was a "Cleveland head"for a big block. While it was a porters head, it had the basic construction for a canted valve head. Probably more accurately, we could go back in time and call the TFS A-460 heads a "Cleveland head" for a big block.
Charlie

Wasn't the Cleveland valve angles around 8* with a 3* side angle where the A460 is more around 13* and 4*? How much better performance would there be with the Cleveland angles in the A460 head or more like a Profiler 221 set up to take the A460 intake and exhaust?
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Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans on February 5th 2019, 12:19 pm

The C3 was/is an improved cleveland by Robert Yates.

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on February 5th 2019, 1:42 pm

Lem Evans wrote:The C3 was/is an improved cleveland by Robert Yates.  

That's a small block head though, not an adaptation for a big block.
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Re: Jon Kaase SR71 Cylinder Heads

Post  JBR-3 on February 5th 2019, 2:20 pm

Yates modified the Cleveland to seek an advantage that was, at the time, not yet outlawed.
The Yates change was to make the chamber smaller for the sky-high compression they wanted.
Also, by making the valves parallel, there was no limit to cam overlap, because the big canted valves
would eventually hit each other. To achieve all this, he had to make the valves smaller, which is almost
never a step in the right direction. Smaller valves are lighter though, to be sure. The ports were not
raised, at least at first, I think in subsequent revisions though the ports were raised.
Overall, his changes did result in more power, even with the smaller valves.

I suspect that valve-clipping was one factor that limited cam design in the Boss 9, that Glidden
knew to be an obstacle, a source of frustration.

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Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans on February 5th 2019, 3:18 pm

68formalGT wrote:
Lem Evans wrote:The C3 was/is an improved cleveland by Robert Yates.  

That's a small block head though, not an adaptation for a big block.

Like Randy said......the C460 head was a scaled up version of the C3 that Yates did for Ford.

Forget about the Cleveland.....something like a big block version of the D3 is the ticket.

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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on February 5th 2019, 8:14 pm

Lem Evans wrote:
68formalGT wrote:
Lem Evans wrote:The C3 was/is an improved cleveland by Robert Yates.  

That's a small block head though, not an adaptation for a big block.

Like Randy said......the C460 head was a scaled up version of the C3 that Yates did for Ford.

Forget about the Cleveland.....something like a big block version of the D3 is the ticket.

The D3 is merely C3H with a larger intake port, having a 2 degree cant of the intake valve only.  The C3H was made for outlaw oval track and for drag racing and is a raised intake port version of the original C3.
The D4 was the latest NASCAR head for a stock block type engine, just before Ford went to the FR9.

The SC1 is the head between the D3 and D4 which Edelbrock copied and now sells in a porters version.  
THAT head up-scaled to a big block version would be really BAD ASS.

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Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT on February 5th 2019, 8:25 pm

rmcomprandy wrote:
Lem Evans wrote:
68formalGT wrote:
Lem Evans wrote:The C3 was/is an improved cleveland by Robert Yates.  

That's a small block head though, not an adaptation for a big block.

Like Randy said......the C460 head was a scaled up version of the C3 that Yates did for Ford.

Forget about the Cleveland.....something like a big block version of the D3 is the ticket.

The D3 is merely C3H with a larger intake port, having a 2 degree cant of the intake valve only.  The C3H was made for outlaw oval track and for drag racing and is a raised intake port version of the original C3.
The D4 was the latest NASCAR head for a stock block type engine, just before Ford went to the FR9.

The SC1 is the head between the D3 and D4 which Edelbrock copied and now sells in a porters version.  
THAT head up-scaled to a big block version would be really BAD ASS.

Damn, if Ford would have stayed in NHRA pro stock some of that development could have happened with the big block.
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Re: Jon Kaase SR71 Cylinder Heads

Post  Lem Evans on February 5th 2019, 11:20 pm

c.evans wrote:
68formalGT wrote:
rmcomprandy wrote:
68formalGT wrote:
Lem Evans wrote:
c.evans wrote:
BBFTorino wrote:How old are the C heads? When did they appear on the scene?

I think the C-460 heads appeared in 1994.  At least that's date on the 4 pages of instructions that came with the heads.
Charlie

1994 is correct.

Wow, 10 years after the A heads. Quite an impressive improvement in that amount of time though.

The "C" head was merely a C3 small block "Yates" NASCAR platform cylinder head made larger to fit the big block engine size.

As well as it worked I wonder why they never made a Cleveland head larger to fit a big block? Was it because the Cleveland was banned in NASCAR?

You could say that the Ford E-460 Pro Stock head was a "Cleveland head"for a big block. While it was a porters head, it had the basic construction for a canted valve head. Probably more accurately, we could go back in time and call the TFS A-460 heads a "Cleveland head" for a big block.


E460 was a copy of the "Olds" prostock head

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Many questions

Post  Ol'Blue77 on February 15th 2019, 9:48 am

This maybe can only be answered by Kaase, but in your opinion, what will make more power. The new SR-71's or the Boss 9 heads? And also I read on another forum where a guy said that these heads will not fit on a A460 block because of the 18-bolt deal. Is this true?

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Re: Jon Kaase SR71 Cylinder Heads

Post  rmcomprandy on February 15th 2019, 10:19 am

Ol'Blue77 wrote:This maybe can only be answered by Kaase, but in your opinion, what will make more power. The new SR-71's or the Boss 9 heads? And also I read on another forum where a guy said that these heads will not fit on a A460 block because of the 18-bolt deal. Is this true?

The Boss9 heads are hard to beat for power.  Both heads fit an A460 block just fine.

Boss9 heads usually use external rear oil returns to the pan.

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