Well for those of you who have been interested in this new Dart 427.

All I can say is that it screams HP.
I was having a problem with the ignition turned out to be the 6 month old Mallory magnetic distribitor. I changed the cap and rotor,coil, disconnected the spark box,lastly changed out the dist and put back my old unilite tach drive. Which is what I was using on the engine stand.

Well now it pulls in all gears now, where as before it was only strong in first and second.

I guess the module went bad I couldn't get it timed and it would surge and pop thru the exhaust.

Anyway I'll see if I take some pics and a new video this weekend.

The cam is pretty lopey cruising @ 2 grand in 4 is ok where as before I could do that in 5th and lower rpm with the 383.

It'll take time to get adjusted to the new way of things.

 

good news.

 

Good to hear the news

What cam do you have in there ?

 

Solid roller 674in 624 ex 274dur@50 106 lobe sep
1.5 rockers. At 3 grand hit the throttle in 2nd and the tires go up in smoke.
Time for some stickier tires

 

Wow! that is a radical cam for the street, let us know how it behaves

 

mmmmmmm, i love cubes.... and lots of 'em

 

I hope that you did away with all of your vacuum operated accessories already.

 

That cam, spec-wise, is in the "ballpark" for most "big-inch" SB's we build for many street cars up in this Long Island, N.Y. area. When you try fill a cylinder with so many inches it has to have so much air. Many of my own customers don't believe the cams we choose for these particular units AND most run fine on pump-gas!

The 468" SB pump-gas unit with 732HP/646T sits and idles at 800 RPM. It is street driven daily in good weather here. Back and forth to the customers shop with absolutely zero issues. Most of these pistons require almost a .375" deep valve notch with a 15 degree head! We have a 440" SB on the "drawing board" using a 1.9+ rocker arm ratio and a .950"+ lift on the intakes. The parts are being rounded up right now. Thanks, Gary in N.Y.

P.S. The only real drawback to building these types of units is the cost of the materials and labor involved. The nice part is the "gas-n-go" scenario from the local station. Even with some 300/400 nitrous on top it still runs AND races on the 93! But that IS the cam sizes required in these units to make those numbers happen.

 

That's fine I could drive my Cuda on the street too with radical cam but it was pain in azz and it was a 4 speed. Big difference between being able to drive it on the street and being comfortable driving it on the street.

That is what I tried to do with my 406ci, make as much power as I could and still have the motor behave almost ( besides the idle ) as a normal mild HP motor would. I think I came pretty close, sure I could make more power but it would be no fun to drive around town.

That is why I am trying to get some feedback from the originator of the thread, to see if he likes the cam on the street or not. It would be nice to ask him in about six months too, when he has had time to really evaluate the motor

 

good stuff

 

Well after driving it for a week or so, I'd have to say that yes it's a little radical for the street. Let me try describe how it behaves, it idles at 900rpm but it would prefer 1100rpm,it just doesn't sound right under a 1000rpm. Cruising now is now a concern it tends to buck, anything under 2000rpm. So with my overdrive doing 60mph is 2000rpm, so I have to play with the throttle.

My 383 would idle and cruise in 5th at 1200rpm all day long it also sounded better ya know that blvd idle.

The new motor likes to give that blvd idle at 1800rpm in first, this motor just sounds like a race motor you can hear the soild rollers working away and that high rpm idle sound.

Don't get me wrong I'm happy with how it turned out I knew it wasn't going to be like the old motor, but it's just a whole different beast now.

I still have a fluctuating idle problem found some oil leaking at the front of the intake,time to pull it off and reseal it bought new gaskets today to do it this weekend.

Anyone wanting to build a motor like this will be more than happy with the power.

I'm looking at the cam card now here are the exact specs.
lift is 675 in 624 ex lobe center is 106+4 267dur @50 intake 272dur@50 ex. I'm not sure what the plus 4 is on the lobe center, does it mean that it's actually 110???

I spent a lot of money on this motor trying to get the best parts so it would be durable and powerfull with out porting and not knowing what the out come would be. Sometime down the road when it's time for a freshing up I can have the heads and intake ported who knows how much more is left on the table from out of the box parts.

Right now the car can't handle anymore power,I don't know how some of you guys are running more power and not having major traction problems and breakage???

Hope this helps anyone that has been following along, I want to take it to the track soon and see what it'll run. I called today and at the Corvette Challenge with my hard top on they'll let go as fast as 11:49
in the 1/4 maybe I'll just try the 1/8 first and calculate from there.

I feel though by the time I'm at the 1/8 mile I would have just gott'n the car settled down, traction right now is a BIG issue.

I'll keep ya posted when I go.

 

I only run the brakes, light buckets are electric.

Actually this motor seems to work the brakes better than the 383.
The old motor made 9"s at idle. The new motor makes about the same I need to fix the leak on the intake and then take another reading, I tested it when it was on the engine stand and it was making about 8 to 10"s.

 

Ttt