My 408 dyno vid from School of Automotive Machinists

[Intense RT]

If you don't see the vid on the main screen, type 408 Mopar in search. It'll be the only one there. Dan

http://www.samracingtv.com/video_detail.php?mId=10383

[Nolan]

Nice numbers! Sounds good.

Nolan

[02DakotaR/T]

Awesome numbers.

[bad360rt]

Very nice :biggthumpup: What cam are you running?

[Intense RT]

Very nice :biggthumpup: What cam are you running?comp custom, 236@.050 248@.050 XFI lobes, .617 lift w/1.7 rockers, Rhodes lifters with 7 of them installed backwards (oops) LOL.

That was with 10% Ethanol Shell 93 pump gas.

EDIT: Forgot to add it's has 114LSA and is installed @ 110 ICL.

[01dakotaR/T]

very nice:biggthumpup:

[Sick 660r]

comp custom, 236@.050 248@.050 XFI lobes, .617 lift w/1.7 rockers, Rhoads lifters with 7 of them installed backwards (oops) LOL.

That was with 10% Ethanol Shell 93 pump gas.

are you talking about oil hole backwards or upside down?

[BluRT00]

Nice! I want one lol.

[razman131]

*takes notes on cam.....*...


ME WANT!!!!......

[Intense RT]

are you talking about oil hole backwards or upside down?Oil hole was facing the oil galley when it's supposed to face the cam. Out of 3 years of being into these trucks, I never saw the issue come up, plus I was used to flat tappets. Just didn't occur to me to pay some f'in attention to it. Doh! I probably had 7 of the lifters pumping up and losing power with rpm up top. No wonder adjusting the lash didn't make much difference in power, only single digits. I know now!

[Intense RT]

Nice! I want one lol.Thanks man. A LOT of hard work and thought went into it...except the lifter oil hole direction. :D

[Intense RT]

*takes notes on cam.....*...


ME WANT!!!!......Go back and check the specs. I forgot to add LSA and ICL.

Thanks for the compliment. There's more in it.

The ratio of the rocker and the extra stem length of the valves has the stem contact sweep a little wide and by the time I would narrow it up, the contact was all the way over on the exhaust side. Had to run it with a shorter pushrod than I wanted to get it centered. I'm thinking I may go to a self aligning 1.6 or a different 1.7 to see if I can get the distance from the trunnion shorter.

[almegaj]

Is that 8.77 time in the 1/8th with the current 408 engine in it?

[Intense RT]

Is that 8.77 time in the 1/8th with the current 408 engine in it?LOL, no man, the 408 is on an engine cradle in my house. I'm still playing with my stock shortblock 360.:biggthumpup:

[ptowntsi]

what heads, crank, pistons did you go with? how much compression? That cam must sound real healthy.

[krs1r/t]

nice numbers man. if it is not a secret post ur build.

[Intense RT]

No secrets...unless I forgot something.:D

Engine specs...

-Cast iron EQ 5.2/5.9 Magnum Cyl heads 285cfm @.600 with good low and mid lift numbers using Stan Weiss' site for reference.
-2.02/1.6 Ferrea 8mm valves
-pushrod pinch maxed out ~.180 thick common wall also
-Cleaned up exhaust port and profiled guide. Did not flow, 200CFM maybe
-64.5cc mirror polished chamber (had time on my hands)
-Comp Beehive springs 150 seat min and 370 open minimum.
-Manley 5 gram titanium 7* retainers, 2.8gram per lock set


Smith Bros .083 wall 5/16 7.050 heat treat pushrods

Scorpion 7/16 1.7 rocker arms grossing .617 lift

10.35:1 compression
.038 quench

Cometic 4.060 bore, .040 thick

4.032 Bore 4.5 piston to wall clearance Sunnen SV-10 final RA of 16
4" stroke

Cloyes timing set w/ timing chain tensioner (made the motor tight)

Total Seal gold gapless top, Napier second, 16lb oil rings. Top gapped to .028 for possible future 150 shot, .036 second ring gap

Keith Black forged step dish (18.4cc) pistons with Calico skirt coating

Comp Cams 236@.050 248@.050 XFI lobes 114 LSA 110ICL

M1 4bbl/EFI intake port matched to heads/minor plenum cleanup

950HP Ultra, 83 jets 4 corners

MSD billet dist. 30* timing by 2700rpm, tried 32* and no detonation, but lost low single digits. Also 28* lost some power.

Plugs were NGK ZFR7F projected tip with cut back strap gapped @.035, Blueing was only about a 1/3 of the way down strap. Ceramic was white with some carbon around ring. No specks. MSD 8.5 wires.

Professional products sfi damper
CSR water pump

oil pressure at 160* was high 40's with 5-30 mobil 1

Scat assembly internally balanced to .15 oz/in (for practice sake)

.003 main clearance, .0024-.0026 rod clearance on stock 360 sized mains (dang, can't remember without my notepad) Anyway, loose enough I believe.

Filter cut and inspected, no large flakes/pieces...looked great.

1 3/4" primary mid length headers with 6" collector extension.

Forget anything??

Numbers...

Rpm/tq/hp

3500 473 315
3600 468 321
3700 464 327
3800 461 334
3900 458 340
4000 456 348
4100 456 356
4200 460 368
4300 465 381
4400 471 395
4500 477 409
4600 482 422
4700 487 436
4800 492 450
4900 495 462
5000 496 473
5100 497 482
5200 496 491
5300 494 498
5400 491 505
5500 487 510
5600 484 516
5700 479 520
5800 474 523
5900 468 525
6000 461 526
6100 453 526
6200 446 526
6300 438 525
Average 474TQ 438hp from 3500 to 6300.

I plan on addressing some things I'm concerned about and hope for 550Hp.

[krs1r/t]

very nice

[bob97sst]

Great sounding engine and some good numbers as well. Look forward to seeing what your final numbers are.

[Intense RT]

Great sounding engine and some good numbers as well. Look forward to seeing what your final numbers are.Thanks! I doubt I engine dyno again. Hard enough to find someone with the right bellhousing to dyno config. Next time will be rwhp.