Cstraub69

This SB 406 Conventional 23 Degree Headed Engine 12.5 to 1 . The customer, an engine builder,was told by his customer thought he had the baddest cammed SBC that he could get for what he had. Cam change oly here. Here is the difference when one builds a combination instead of an engine. Heads are 215 and intake is a Dart. All work done by Mike Stark. Single AED 4150 Carb. Stepped headers 1 3/4 to 1 7/8".




RPM Hp Tq HP Tq HP Tq
Other Other Straub Straub Gain Gain
4000 363 477 411 538 48 61
4100 374 480 422 541 48 61
4200 390 487 441 551 51 64
4300 406 496 460 562 54 66
4400 424 506 479 572 55 66
4500 442 516 498 581 56 65
4600 461 526 516 589 55 63
4700 480 536 535 598 55 62
4800 498 545 552 604 54 59
4900 515 552 568 609 53 57
5000 530 557 581 610 51 53
5100 542 559 591 609 49 50
5200 553 559 600 606 47 47
5300 564 559 609 603 45 44
5400 575 559 617 600 42 41
5500 585 559 624 596 39 37
5600 595 558 629 590 34 32
5700 604 557 635 585 31 28
5800 614 556 642 581 28 25
5900 623 555 648 577 25 22
6000 632 554 654 572 22 18
6100 640 551 660 568 20 17
6200 646 548 665 563 19 15
6300 651 543 669 558 18 15
6400 654 537 669 549 15 12
6500 656 530 667 538 11 8
6600 656 522 666 530 10 8
6700 656 514 666 522 10 8
6800 654 505 661 511 7 6


Old Cam
650/640 262/270 @.050" on 114

New Cam
670/640 252/265 @ .050" on 108

hugie82

400 do respond nice to a tight 109 LSA

cv67

Nice gains across the board everywhere not just at pk or a little low end tq. Good work Chris.

Something tells me I got too much cam in my 383 lol. As usual

bluedawg

Nice. Looking at just the gains, would you be able to gain the same percentage using a stock engine. Obviously no were nerve the peak number wise, but 60 horse for a gain from just the cam. I realize it would be a different grind but would you be able to gain along the same amount. The reason I ask Chris is there are a lot of post from members wanting to change just the cam for performance.

Cstraub69

Blue,
If someone can give me all the run down on these engines including the head casting number that came on them, then I can design a retro roller to go in them, changing springs is a must but would fit the stock retainer, and can tell you within 5HP of what the change would be.

Chris

Little Mouse

Ya but at 6600/6700 before it dropped off you made his engine evil Let me guess he stuck the chevy in a dodge demon.

Cstraub69

It sits between the fenders of a 69 Camaro!!

MotorHead

Must live near a dragsrtip for gas, the real trick is to make 650HP that you can drive around town, won't overheat if stuck in traffic etc. etc. I could have made over 700hp easy with that kind of compression but I want to get in on a hot day and drive around town and fill it up with 91 octane. Making 650HP with a 406ci isn't any harder than making 550HP that runs on 91 octane and all the gas stations have it.

oldschoolvette

awesome numbers

diehrd

I see the numbers but would the new cam idle well enough to be streetable ? Would breaks work properly ? That first cam only lost a few ponies at the top rpm , yes it lost a lot more down low but it would be nice to see how each motor runs from 950 to 4k

Cstraub69

Making 650HP with a 23 degree head that is not an exotic piece and all while using pump gas is a tall order and an expensive one. The combination would have to be dialed in.

Now a set of 18's or a rolled 12 degree head, thats a different story.

Cstraub69

This combo is a drag car that sees the street. What the customer wants. The fact is what he thought was a good combination was not as those are nice gains with just camshaft change.

I hear it all the time, man this thing runs good, well does it really?

Pulling an engine down to measure power down low take a dyno in the $1M range. Water break dynos are impossible to load below 3000 rpm without stalling the engine.