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Old 01-28-2009, 10:00 AM
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Default Kaase Boss 9 head specs

I have read up on everything I can find on the Kaase Boss 9 heads. Does anyone know what the port volumes are? Would they work good on a lower rpm jet boat (5000 rpm) with ci of 550-600? I would love to build a nice 545 or 589 with a cent supercharger on it. I have a 501 right now with Edelbrock's on it making close to 800 hp on pump gas. I would like to hit the 1000 hp mark if I could.
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Old 01-28-2009, 10:20 AM
dfree383 dfree383 is offline
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I don't thing you'll get a 1000hp at 5000rpm if that what your asking.
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Old 01-28-2009, 10:59 AM
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Well right now I am making close to 800 with a 501 ci on 87 octane and 5psi boost. Thats 1.59 hp per ci. So a 589 should be able to make 1000 hp on 93 octane and 6 or 7 psi boost. Don't you think?
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Old 01-28-2009, 12:10 PM
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I wasn't considering the Boost, Probably doable.
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Old 01-28-2009, 12:39 PM
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So back to my origanol question. What is the port size on the Kaase head? Do you think that the sizing would be right for a 589 and that rpm. Come on I know you know, I will even say please :lol: :lol:.
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Old 01-28-2009, 12:47 PM
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I'll dig up the out of the box flow numbers me and Charlie came up with last year for you tonight.

I think they will work every bit as good as a set of A460's IMO.

I Haven't cc'd them so I'm not sure on the Port Volumns, but I'd guess them to be similar to a set of SCJ's. / P-51's
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Old 01-28-2009, 01:05 PM
dfree383 dfree383 is offline
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Heres our Published Dyno Pull for the EMC, It might Help you Calculate some numbers for your build

432 CID, 10.5:1, 251 Degree FT Cam, 2" Headers, Single 1050.


Torque Horse Power

2,500 472 225
2,600 485 540
2,700 495 254
2,800 500 266
2,900 499 275
3,000 496 283
3,100 492 290
3,200 483 294
3,300 473 297
3,400 462 299
3,500 546 308
3,600 461 316
3,700 470 331
3,800 479 346
3,900 496 368
4,000 521 396
4,100 546 426
4,200 566 452
4,300 583 477
4,400 593 496
4,500 598 513
4,600 604 529
4,700 604 540
4,800 605 553
4,900 609 568
5,000 612 583
5,100 613 596
5,200 614 608
5,300 614 620
5,400 613 631
5,500 613 642
5,600 610 650
5,700 605 657
5,800 601 663
5,900 597 670
6,000 592 677
6,100 586 681
6,200 581 686
6,300 578 693
6,400 574 699
6,500 570 705
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Old 01-28-2009, 07:42 PM
rmcomprandy rmcomprandy is offline
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A 545 or 572 with those BOSS heads and 7 pounds of boost??? - EASILY...!
But, your pump will now be going over that 5000 RPM you speak about...
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Old 01-28-2009, 09:09 PM
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Here is the out of the Box as Cast Flow numbers for the Kaase Heads I have. This is with Manley 2.30 Intakes amd 1.90 Exhaust Valves and they are untouched out of the Box.

Intake Exhaust
.100 76 54
.200 162 129
.300 242 215
.400 324 260
.500 375 280
.600 400 295
.700 400 302
.800 395 310
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Old 01-29-2009, 09:30 AM
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That's the neat thing. I have designed a twin pump drive for one engine. I have made about 5 of them ranging from 500 hp 502 to 400 hp Cumins deisel's. So I can hold it at 5000 rpm. It will just pull alot harder.
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Old 01-29-2009, 09:35 AM
rmcomprandy rmcomprandy is offline
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It will pull the hardest at the engine's PEAK TORQUE; whatever that may be.
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Old 01-29-2009, 11:12 AM
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That's how I usually biuld the motor. I try and get the peak torque to the rpm I want to run. You would think that it would be an easy build but most engine builders don't get it. For our race boat we run it at 6300 rpm and thats were the torque peak is but the hp peak is around 7500. When we tell guys what cam we have and head they always think that the cam is to big and the heads are to small.
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