quess the hp/send your opinion ...getting dynoed 11-11-09

[bixblk]

SEND YOUR OPINION
I JUST PUT A 496 BBC TOGETHER
SPECS AR FOLLOWS:
TEAM MAGNUSON BBC

496 CI (4.25 STROKE. 4.310 BORE)
SHORT BLOCK AS FOLLOWS:
GM BLOCK
SCAT CRANK
EAGLE H RODS 6.385
SRP PISTONS W/43 CC DOMES
12.65 TO 1 COMPRESSION

VALVE TRAIN
BULLET ROLLER DEGREED @108
.714 LIFT INT AND EXH
300 DEGREES ADVERTISED DURATION INTAKE
310 EXH
ACTUAL LIFT .695 AT VALVE (PLUS 18 LASH )=.713
COMP ROLLER LIFTERS
COMP GIRDLE
COMP ROCKERS 1.7
VALVE SETS AT 18 COLD 22 HOT
SINGLE DOMINATOR 1050
DART PRO 1 OUT OF BOX
2.30 INT
1.88 EXH

COYLES TIMING GEAR W/ TORRINGTON BEARING AND COVER (ADJ)

QUESS THE HP ?????????
NO CHEATING DO NOT USE THE HP CALCULATORS
I HAVE FOUND THEM TO BE PRETTY CLOSE
LET ME KNOW JEFF

[DirkaDirka]

I am just guessing and saying 600ish hp maybe???

[bixblk]

PRETTY SURE IT WILL BE MORE THAN THAT

[DirkaDirka]

Im still learning everything about those there race motors.

[bixblk]

I'M WITH YA
600 ISH AT THE WHEELS ?????? WOULD BE NICE
THIS IS PRETTY COMON COMBO, BUT THIS ONE SOUNDS GUTSZY

[bixblk]

ANOTHER TIP
I THINK THESE HEADS MAYBE A LITTLE TOO BIG FOR JUST A 496 INCH MOTOR
BUT MAYBE A 250 SHOT WOULD WAKE THESE HEADS UP AND GET THEM WORKING A LITTLE BETTER
CANNOT GIVE AWAY SECRETS, BUT THIS MOTOR WILL NOT BE RAN AT THE TRACK TILL 2010.
WE WILL SEE

[zipper06]

You didn't say what manifold, i don't think the heads are too big, if you have a 454R intake and 2 1/8"/2 1/4" headers, we're pushing close to 750Hp with a pump gas 468" with Brodix 2 extra heads.
I'm guessing real close to 800 HP. with right tuning, maybe a little more. I'm buliding a 496" for a customer with Dart 308's steel heads and stacks injection, i'm looking to go more than 800 HP with it.

JMO

Zip.

[cepx111]

825 HP +/- 25

[cepx111]

I am just guessing and saying 600ish hp maybe???
LOL ~> Dennis
Maybe if it was a 3/4 cam corvette motor.

[fla1976]

772 hp, 821 tq

[shawnp]

I am going to go a little low on the set up and say 740ish.

[I972Nova]

765 horse. 685 ft pounds.

[bixblk]

sorry 454 r intake dominator flange

I was a little dissapointed, just off the dyno 703 HP 689 torque
it likes 38 degrees of timing very flat curve
ususally we get 10 to 15 more HP after the fresh motors "seat up"
but I really thought 750 ish....I will tell you this one (with open headers) really cracks. It sounds pretty special..... and I have heard a lot of motors

just goes to show you.... you never know
jeff

[russ67chevelle]

WHAT RPM DID PEAK TQ AND HP OCCUR? CAN U POST FULL DATA FROM DYNO SHEET? YOUR GIVING UP SOME HP SOMEWHERE MAYBE COULD USE MORE LOBE SEP ANGLE?I WAS EXPECTING 750HP OR SO WITH 700TQ


WHEN I DYNOED MY CAR,THE BIGGEST THING I TUNED FOR WAS A CONSISTENT AIR FUEL RATIO FROM 3500 TO 7200.I DONT MEAN TO HIJACK,BUT IS THAT ULTIMATE GOAL?THEN TO PLAY WITH MAIN FUEL JETS TO SEE WHERE MOTOR LIKES AIR FUEL RATIO???

[cepx111]

And the winner is?????

Shawnp with his 740ish guess.

I have a 496 in my 69 camaro and love it.

Who needs a 511 or a 540.

Though I've never dynoed it, I figure I'm all over the 750 mark.

Our combos are similar.
But I've got worked cast iron VR325 merlin heads and a tad more cam (722/722 lunati) compression> 13-1

Best ET so far is 5.60 with 1.27 sixty


I believe there more to be made with yours.

Try some carb spacers and play with the jetting and timing curve.

Were you running gas or alcohol? Just Curious what ignition and plug gap and type of plug did you use?


Keep us updated, Cp

[bixblk]

gas motor
single 1050 dominator (2 circuit)
hei w/mag pick up (I may change this to an msd w/ a seperate coil) but that should not increase HP but may be more consistant
ngk 8 heat range
It has the Dart s 345's
As a comparison:
I have a 489 BBC steel closed chambered GM heads. full roller , 695 lift cam 275 duration, ends up being 10:45 to 1 compression forged internals,it made 608 HP on the same dyno,
so........with a couple of compression points, a bit bigger cam, much "bigger" heads,same carb, and ignition 100 more hp

[zipper06]

I too am surprised at that HP reading, i posed this same question about 3 mos. ago, but with a smaller set of 308 heads and hilborn stacks on gas. Take a look at Tcarda post in this thread.

Zip.

http://forums.racingjunk.com/viewtopic.php?t=10794

[bixblk]

JUST AS A FINAL NOTE. I KNOW THIS 496 IS ONLY 703 ON NUT ........BUT IT IS THE HEALTHYEST 700HP BBC THAT I HAVE HAVE HEARD IN A LONG TIME.........THIS MOTOR CRABS RPMS LIKE A NASCAR MOTOR...PLUS THE DYNO CURVE LOOKS LIKE DC VOLTAGE CONVERTOR FLASHES HP CURVE GOES STRAIGHT UP MAKES A HARD RIGHT AND STAYS THERE. HARD TO TELL WHERE THE PEAK POWER IS (AT A GLANCE)
THIS ONE IS SPECIAL....AND I THINK IT WILL WANT SPRAY
REALLY CURIOUS ABOUT ET'S WIITH THIS ONE .
LATER