Jon Kaase SR71 Cylinder Heads

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Re: Jon Kaase SR71 Cylinder Heads

Post  psfracer on November 13th 2018, 2:22 am

jonkaase wrote:


I know this is pretty much unbelievable, but this went past our goal. First sheet is with cam at 113, second is at 116. Timing at 28. It took 5 runs before these sheets to get the carbs right. 6 cylinders were way rich and the front two needed fuel. It would be hard to figure out without all 8 O2 sensors on the primary pipes. Special thanks  to Billy Godbold at Comp Cams for making 2 new lobes for me. This engine has 179 gram steel intake valves, stud rockers with no stud girdle, and Manley Nextek dual springs with 250# on the seat and 750# open. Trend 3/8 pushrods, .135 wall.  It still sounds like it wants more at 8100. Since we were going over 8000 rpm I started it a little higher than the other runs. Peak torque was below the starting RPM.

Wow, just awesome results. These heads seem to be an outstanding choice.
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Re: Jon Kaase SR71 Cylinder Heads

Post  fordsrgrt on November 13th 2018, 10:03 am

Got my set from Jon last week and had them cut down to 65cc.If one was to do some minimal port work with the best return on time would that be on the guide boss , as in possibly shorten it some and narrow it and transition it into the bowl area? Thanks

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Re: Jon Kaase SR71 Cylinder Heads

Post  nascar429 on November 16th 2018, 10:22 pm

fordsrgrt wrote:Got my set from Jon last week and had them cut down to 65cc.If one was to do some minimal port work with the  best return on time would that be on the guide boss , as in possibly shorten it some and narrow it and transition it into the bowl area? Thanks

I sent you a PM fordsrgrt.. like the user name.... Wink

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Re: Jon Kaase SR71 Cylinder Heads

Post  Dave De on December 5th 2018, 1:40 pm

I got my 71's installed now waiting for the 2019 season.
If you are on the fence with these I can tell you that they are quality pieces. The stud bosses are tall to keep the rocker body closer to the base of the stud reducing the side force moment on the stud.
I will compare with other heads from track data and report here in the spring.


Last edited by Dave De on December 5th 2018, 11:26 pm; edited 1 time in total
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Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle on December 5th 2018, 11:09 pm

Dave De wrote:I got my 71's installed now waiting for the 2019 season.
If you are on the fence with these I can tell you that they are quality pieces. The stud bosses are very to keep the rocker body closer to the base of the stud reducing the side force moment on the stud.
I will compare with other heads from track data and report here in the spring.


You didn't waste any time! Out of the box or did you tweak them any?

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Re: Jon Kaase SR71 Cylinder Heads

Post  Dave De on December 5th 2018, 11:29 pm

jbozzelle wrote:
Dave De wrote:I got my 71's installed now waiting for the 2019 season.
If you are on the fence with these I can tell you that they are quality pieces. The stud bosses are very to keep the rocker body closer to the base of the stud reducing the side force moment on the stud.
I will compare with other heads from track data and report here in the spring.


You didn't waste any time!  Out of the box or did you tweak them any?


Straight out of the box. The ports were close enough I didn't touch them. I am waiting on Jomar to finish the girdles but I wont need them until April.
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Re: Jon Kaase SR71 Cylinder Heads

Post  jbozzelle on December 6th 2018, 11:53 am

Dave De wrote:
jbozzelle wrote:
Dave De wrote:I got my 71's installed now waiting for the 2019 season.
If you are on the fence with these I can tell you that they are quality pieces. The stud bosses are very to keep the rocker body closer to the base of the stud reducing the side force moment on the stud.
I will compare with other heads from track data and report here in the spring.


You didn't waste any time!  Out of the box or did you tweak them any?


Straight out of the box. The ports were close enough I didn't touch them. I am waiting on Jomar to finish the girdles but I wont need them until April.

Looking forward to the results...

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