Jon Kaase SR71 Cylinder Heads

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Post  cletus66 on March 9th 2019, 9:58 pm

BBFTorino wrote:Man, if you're going with a big Roots type blower, I'd use the Boss heads!!


I remember reading that the SOHC FE heads worked great with a blower till the bottom end fell apart, and the Boss heads didn't work well with a blower due to the port design. I read too much when I drink... scratch
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Post  SandHillsHillbilly on March 9th 2019, 10:11 pm

738drvr wrote:You’re building a street engine. Either set of heads would be more than enough for what you’re doing. I would use carbs for that build. Mechanical injection is really best at the track not the street.

I will second that. I build blown mech injected systems all day long. You will hate driving it on the street. If you are wanting the nostalgic look you can still use the mech. pump and injector hat, just convert it to EFI. You will appreciate it especially when it comes to drag week.
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Post  jasonf on March 9th 2019, 11:09 pm

Ol'Blue77 wrote:Question 1:
What makes the Kaase Boss 9 Heads "not a race head"? Valves, fluid flow, head material?
Question 2:
What makes the SR-71 more of a race head?
Question 3:
I know that flat top and dome pistons need the valve reliefs for the Boss 9 heads, but do 38cc dish pistons need valve reliefs? I can't find Diamond or Mahle dish pistons that say they work with the Boss 9 heads.
Question 4:
Do the SR-71 heads have enough of a valve angle on them that the piston would need valve reliefs?
Story:
I am planning to build a 545 stroker, Hampton 8-71, Hilborn mechanical injection and stuffing this into a 65 Galaxie. About a year ago, I was dead set on the Boss 9's but now these SR-71's are out, and I am stuck between the two. I want the 38cc pistons so that I will have 8.5:1 compression and with the Hampton running 6-8 pounds, that will give around 12:1-13:1.
This is for a drag race build, in hopes to compete at Drag Week. Not necessarily to win but at least finish and average in the 9's or 10's.

Either head should get you to that goal without a 671..
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Post  Carbguy on March 13th 2019, 5:32 pm

Ol'Blue77 wrote:Question 1:
What makes the Kaase Boss 9 Heads "not a race head"? Valves, fluid flow, head material?
Question 2:
What makes the SR-71 more of a race head?
Question 3:
I know that flat top and dome pistons need the valve reliefs for the Boss 9 heads, but do 38cc dish pistons need valve reliefs? I can't find Diamond or Mahle dish pistons that say they work with the Boss 9 heads.
Question 4:
Do the SR-71 heads have enough of a valve angle on them that the piston would need valve reliefs?
Story:
I am planning to build a 545 stroker, Hampton 8-71, Hilborn mechanical injection and stuffing this into a 65 Galaxie. About a year ago, I was dead set on the Boss 9's but now these SR-71's are out, and I am stuck between the two. I want the 38cc pistons so that I will have 8.5:1 compression and with the Hampton running 6-8 pounds, that will give around 12:1-13:1.
This is for a drag race build, in hopes to compete at Drag Week. Not necessarily to win but at least finish and average in the 9's or 10's.

1/2: Neither the Boss Head or the SR-71 are race heads they are designed to work within specific parameters. The Boss is designed to fit the original Boss architecture as far as Valve Covers, Intakes, and Exhaust to reproduce a specific look for heads that are no longer manufactured. The SR-71 while having phenomenal performance potential is not an all out race head as it was designed and engineered to work with factory CJ style intake and exhausts. If you were to build a true race head without considering some of these things there are always more things you can do.

3: Since the combustion chambers are different sizes between these two cylinder heads you compression ratio would vary. Both Diamond and Mahle offer shelf pistons for the Boss Heads but they are obviously different between a Boss and SR-71.

4: Yes you would need valve reliefs in your pistons to run an SR-71 head.

Either head would get you in the power range that you are wanting, it would just be a matter of matching up the rest of the proper parts and pieces and what look you are wanting. If you're wanting the Shotgun look then go Boss if not the SR-71 is an easy choice.

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Post  738drvr on March 13th 2019, 5:44 pm

BINGO^^^^^^^
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Post  Ol'Blue77 on March 20th 2019, 9:02 am

So what I'm getting at it is, use EFI, diamond will custom make the pistons i need, and the power numbers between the heads are so similar the only difference is the number of $$$'s. And the cool look.

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Post  738drvr on March 20th 2019, 3:18 pm

You cracked the code. You got it.

Now build it.
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Post  738drvr on March 29th 2019, 1:22 am

Sent a head to RaceTec today. Should have my pistons started next week. Ordered the cam from Bullet today.

Car is being finished this week(wiring).

Back to the chassis guy in a week or two to set the block back on the motor mounts.

Once the engine is done, I think I’m going to let Elston do the 421 headers on it.

We’re going to be on kill for Dragweek this year. Hope to be a solid second. First if Doc doesn’t show or breaks in Pro Street NA. He’s good(and fast and way bigger than us 706 vs 557).
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Post  CDMBill on May 20th 2019, 1:19 pm

Carbguy wrote:
Ol'Blue77 wrote:Question 1:
What makes the Kaase Boss 9 Heads "not a race head"? Valves, fluid flow, head material?
Question 2:
What makes the SR-71 more of a race head?
Question 3:
I know that flat top and dome pistons need the valve reliefs for the Boss 9 heads, but do 38cc dish pistons need valve reliefs? I can't find Diamond or Mahle dish pistons that say they work with the Boss 9 heads.
Question 4:
Do the SR-71 heads have enough of a valve angle on them that the piston would need valve reliefs?
Story:
I am planning to build a 545 stroker, Hampton 8-71, Hilborn mechanical injection and stuffing this into a 65 Galaxie. About a year ago, I was dead set on the Boss 9's but now these SR-71's are out, and I am stuck between the two. I want the 38cc pistons so that I will have 8.5:1 compression and with the Hampton running 6-8 pounds, that will give around 12:1-13:1.
This is for a drag race build, in hopes to compete at Drag Week. Not necessarily to win but at least finish and average in the 9's or 10's.

1/2:  Neither the Boss Head or the SR-71 are race heads they are designed to work within specific parameters.  The Boss is designed to fit the original Boss architecture as far as Valve Covers, Intakes, and Exhaust to reproduce a specific look for heads that are no longer manufactured.  The SR-71 while having phenomenal performance potential is not an all out race head as it was designed and engineered to work with factory CJ style intake and exhausts.  If you were to build a true race head without considering some of these things there are always more things you can do.

3:  Since the combustion chambers are different sizes between these two cylinder heads you compression ratio would vary.  Both Diamond and Mahle offer shelf pistons for the Boss Heads but they are obviously different between a Boss and SR-71.

4:  Yes you would need valve reliefs in your pistons to run an SR-71 head.

Either head would get you in the power range that you are wanting, it would just be a matter of matching up the rest of the proper parts and pieces and what look you are wanting.  If you're wanting the Shotgun look then go Boss if not the SR-71 is an easy choice.

You don't need a blower on a 545" with either head to go high 9's low 10's at Drag Week with that Galaxie. It would be way cool with a blower sticking through the hood. What fuel do you plan to run? That decision will influence everything else. If it were me I'd up the compression, run well under driven on the road with pump premium of E85 depending on year and route.Then over drive it and run C16 at the track. If you go stand alone EFI you'll thank me later.

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Post  427John on June 3rd 2019, 10:41 am

This may be old news but just saw an episode of engine power I had DVR'ed about JKRE and the SR-71 in particular,they built a 598 with what appeared to be out of the box SR-71's and made 1011hp NA,it also had a sidebar with JK explaining the design with a cut up head for visual aids.Pat T. refers to the heads as ported as cast.At the beginning during the walk around they have some good shots of that bitchin 900 horse Mel motor that won EMC vintage.Head gasket?Thats some creative interpretation there.




















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