My fist engine is a big block
489 10:1, 781 ovals mild port, polishing work 2.19/1.88 SS valves, 1 3/4" headers, 2 1/2" flowmaster exhaust, MSD ignition, RPM Airgap intake, 870 Holley Street Avenger, Comp cams 280H 280 280, lift .520, Duration At 0.05 230 230, Lobe Separation 110, Crane Gold 1.7 roller rockers.

The second is a 408 small block, 10:1 Dart Pro 1 215 heads, Comp 1.5 roller rockers, 1 5/8 headers short/ mid length, 2 1/2 Flowmaster exhaust, MSD ingition, RPM Airgap intake, 750 Holley, Lunati/UD .530/.530 Hyd roller, 110, intake is 234/242, exhaust 288/296,

What estimates HP and torque do you have for my engines? My BB I think the cam is on the small side. Should have gone with a grind from Harold/Lunati. I run a 2500 stall with 3.55 gears.

Will my 408 be lazy down low with the 215s? They are stock? It has a 2800 Stall and 3.73 gears.

Thanks,

For the 408 SB I dont think it will be lazy down low at all with the 2800 stall(which will probably stall at +3000) and 3.73 gears BUT the power really won't come on till +3500rpm(peak ~6000rpm) I would assume. I make this assuming your wagon isn't much more than 3800lbs... As for a hp/tq figure... I'd estimate around 500hp@6000rpm and about the same torque. IS that a dual 2 1/2" exhaust setup? If not it will definately hold you back your output.

Yep is is a dual exhaist with a cross over.

What about the big block. It has tons of torque and power.

I'd venture to say the big block is in the 500 HP range,and about 530 ft/lbs. torque


..a timeslip will tell alot ;)

bump

I agree with the others on the hp being about 500 for both. That cam is very mild for a 489, but I would run it to see if you like it first. I would like to own the tire store near your house. The 215 is a pretty big head and is going t kill off some low end torque. You will probably only notice it though if you put tires on it and ran it at the track. Most cars are pretty traction limited on the street.

60204 60204LK 276/284 233/241 .554/.572 110/106 71817 73815 75702LUN 77004 65001LUN 2200-6400

What if I went with this Lunati Voo Doo cam in my BB what kind of gains could I see?

I don't mean to be glib, but I was going to add that the 406 will likely do as much or more than the bbc. Its all about the cam. Give it some lift man. Although I cant personally comment on the 280H. Using nice roller rockers you can shoot for .570-.600 lift easy. Check P/V and check pushrod length to ensure everything is way copasetic at that lift, as well as the springs. ( But believe it or not, a solid flat tappet would likely work those current springs well at a moderate 6200 rpm. )

That voodoo cam has alot more agressive lobe than the 280h, I am thinking 15-25 more peak hp and an extra 300-500 rpm on top. From what I understand the duration at 200 inch lift is important and the that is where the voodoo specs will show a big change over your current cam.

Correct, but don't get me wrong - the rat should be a smooth, drama-free, thumper. You might like it the way it is. As Mike alludes to, a similarly-sized 'modern' grind would give you as much as 10-15 degrees more at .200 and another .050-.080" lift. The valve comes off the seat faster, which brings in midrange tq better, etc...( I swapped a bigger, but ,modern grind, in and found low and midrange tq as well as a stronger pull at 6800!) but run in the 280h and you might be well pleased with the rat.

Regarding the big block, I doubt that a switch to the VooDoo and 6 degrees added intake timing would add that much. The added exhaust timing would help a lot, but you may not get all the airflow you can actually use with the intake timing. On a dyno, maybe 25 HP, maybe a little more, but for the most part, you should be hard pressed to notice the diff between say 500 and 530 HP in a street car, especially with a thumper motor. Also, with 10/1 CR built in, you can steer away from the real quick ramp cams.

If a cam change is in the picture, consider looking into a custom grind (talking flat tappet hyd for now if that's what you want to run). Isky has some nice flat tap hyd lobes that work well in the long stroke motors.

H392/H584 292/298, 244/252 @ .050, .573/.573 grind it on 112LSA, install on 108ICL

H443/H393 296/304, 248/256 @ .050, .602/.595
grind it on 114LSA, install on 110ICL

When I was going the 496 route these were the cam specs we had in mind. They can do these on the P55 premiun core for about 180.00. These bigger grinds should get you into the 550HP range - or so I was advised.

So It may not be worth it unless I'm trying to get a faster ET or something?

The .602/.595 sounds pretty big especially with the 2500 stall I have.

It does run well and it has lots of power. Smokey burn outs and chirping the tires if I nail it. I had thought about swapping in a partiel set of 1.8 rockers on the intake side or a full set. But I may leave it as is.

More power is always in the back of my mind. :D

The .602/.595 may be too big of a jump for you. We were considering it to match the car's existing set up - 3000 stall w/3.73's. My own personal experience has been that a 6 degree chnage just starts to be noticeable in a 450CI motor (haven't played with a big stroker yet, but I would assume the impact would be less noticeable). I only offer the 240@.050 based on what I have read in the past baseline engine 350CI use 220@.050, add 8-10 degrees for every 50CI.